Section R703

R703.1 General.¶

Exterior walls shall provide the building with a weather-resistant exterior wall envelope. The exterior wall envelope shall include flashing as described in Section R703.4.

Exception: Log walls designed and constructed in accordance with the provisions of ICC 400.

R703.1.1 Water resistance. The exterior wall envelope shall be designed and constructed in a manner that prevents the accumulation of water within the wall assembly by providing a water-resistant barrier behind the exterior cladding as required by Section R703.2 and a means of draining to the exterior water that penetrates the exterior cladding.

Exceptions:

A weather-resistant exterior wall envelope shall not be required over concrete or masonry walls designed in accordance with Chapter 6 and flashed in accordance with Section R703.4 or R703.8.
Compliance with the requirements for a means of drainage, and the requirements of Sections R703.2 and R703.4, shall not be required for an exterior wall envelope that has been demonstrated to resist wind-driven rain through testing of the exterior wall envelope, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E331 under the following conditions:

2.1. Exterior wall envelope test assemblies shall include at least one opening, one control joint, one wall/eave interface and one wall sill. All tested openings and penetrations shall be representative of the intended end-use configuration.

2.2. Exterior wall envelope test assemblies shall be at least 4 feet by 8 feet (1219 mm by 2438 mm) in size.

2.3. Exterior wall assemblies shall be tested at a minimum differential pressure of 6.24 pounds per square foot (299 Pa).

2.4. Exterior wall envelope assemblies shall be subjected to the minimum test exposure for a minimum of 2 hours.

The exterior wall envelope design shall be considered to resist wind-driven rain where the results of testing indicate that water did not penetrate control joints in the exterior wall enve

lope, joints at the perimeter of openings penetration or intersections of terminations with dissimilar materials.

R703.1.2 Wind resistance. Wall coverings, backing materials and their attachments shall be capable of resisting wind loads in accordance with Tables R301.2(2) and R301.2(3). Wind-pressure resistance of the siding, soffit and backing materials shall be determined by ASTM E330 or other applicable standard test methods. Where wind-pressure resistance is determined by design analysis, data from approved design standards and analysis conforming to generally accepted engineering practice shall be used to evaluate the siding, soffit and backing material and its fastening. All applicable failure modes including bending rupture of siding, fastener withdrawal and fastener head pull-through shall be considered in the testing or design analysis. Where the wall covering, soffit and backing material resist wind load as an assembly, use of the design capacity of the assembly shall be permitted.

R703.2 Water-resistive barrier.¶

One layer of No. 15 asphalt felt, free from holes and breaks, complying with ASTM D226 for Type 1 felt or other approved water-resistive barrier shall be applied over studs or sheathing of all exterior walls. No.15 asphalt felt shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2 inches (51 mm). Where joints occur, felt shall be lapped not less than 6 inches (152 mm). Other approved materials shall be installed in accordance with the waterresistive barrier manufacturer’s installation instructions. The No. 15 asphalt felt or other approved water-resistive barrier material shall be continuous to the top of walls and terminated at penetrations and building appendages in a manner to meet the requirements of the exterior wall envelope as described in Section R703.1.

R703.3 Wall covering nominal thickness and attach-ments.¶

ments. The nominal thickness and attachment of exterior wall coverings shall be in accordance with Table R703.3(1), the wall covering material requirements of this section, and the wall covering manufacturer’s installation instructions. Cladding attachment over foam sheathing shall comply with the additional requirements and limitations of Sections R703.15 through R703.17. Nominal material thicknesses in Table R703.3(1) are based on a maximum stud spacing of 16 inches (406 mm) on center. Where specified by the siding manufacturer’s instructions and supported by a test report or other documentation, attachment to studs with greater spacing is permitted. Fasteners for exterior wall coverings attached to wood framing shall be in accordance with Section R703.3.3 and Table R703.3(1). Exterior wall coverings shall be attached to cold-formed steel light frame construction in accordance with the cladding manufacturer’s installation instructions, the requirements of Table R703.3(1) using screw fasteners substituted for the nails specified in accordance with Table R703.3(2), or an approved design.

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Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

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TABLE R703.3(1) SIDING MINIMUM ATTACHMENT AND MINIMUM THICKNESS

SIDING MATERIAL		NOMINAL THICKNESS (inches)	JOINT TREATMENT	TYPE OF SUPPORTS FOR THE SIDING MATERIAL AND FASTENERS
SIDING MATERIAL	SIDING MATERIAL	NOMINAL THICKNESS (inches)	JOINT TREATMENT	Wood or wood structural panel sheathing into stud	Fiberboard sheathing into stud	Gypsum sheathing into stud	Foam plastic sheathing into studl	Direct to studs	Number or spacing of fasteners
Anchored veneer: brick, concrete, masonry or stone (see Section R703.8)	Anchored veneer: brick, concrete, masonry or stone (see Section R703.8)	2	Section R703.8	Section R703.8	Section R703.8	Section R703.8	Section R703.8	Section R703.8	Section R703.8
Adhered veneer: concrete, stone or masonry (see Section R703.12)	Adhered veneer: concrete, stone or masonry (see Section R703.12)	—	Section R703.12	Section R703.12	Section R703.12	Section R703.12	Section R703.12	Section R703.12	Section R703.12
Fiber cement siding	Panel siding (see Section R703.10.1)	5/16	Section R703.10.1	6d common (2 × 0.113)	6d common (2 × 0.113)	6d common (2 × 0.113)	6d common (2 × 0.113)	4d common (11/2 × 0.099)	6 panel edges 12 inter. sup.
Fiber cement siding	Lap siding (see Section R703.10.2)	5/16	Section R703.10.2	6d common (2 × 0.113)	6d common (2 × 0.113)	6d common (2 × 0.113)	6d common (2 × 0.113)	6d common (2 × 0.113) or 11 gage roofing nail	Note f
Hardboard panel siding (see Section R703.5)	Hardboard panel siding (see Section R703.5)	7/16	—	0.120 nail (shank) with 0.225 head	0.120 nail (shank) with 0.225 head	0.120 nail (shank) with 0.225 head	0.120 nail (shank) with 0.225 head	0.120 nail (shank) with 0.225 head	6 panel edges 12 inter. sup.d
Hardboard lap siding (see Section R703.5)	Hardboard lap siding (see Section R703.5)	7/16	Note e	0.099 nail (shank) with 0.240 head	0.099 nail (shank) with 0.240 head	0.099 nail (shank) with 0.240 head	0.099 nail (shank) with 0.240 head	0.099 nail (shank) with 0.240 head	Same as stud spacing 2 per bearing
Horizontal aluminuma	Without insulation	0.019b	Lap	Siding nail 11/2 × 0.120	Siding nail 2 × 0.120	Siding nail 2 × 0.120	Siding nailh 11/2 × 0.120	Not allowed	Same as stud spacing
Horizontal aluminuma	Without insulation	0.024	Lap	Siding nail 11/2 × 0.120	Siding nail 2 × 0.120	Siding nail 2 × 0.120	Siding nailh 11/2 × 0.120	Not allowed	Not allowed
Horizontal aluminuma	With insulation	0.019	Lap	Siding nail 11/2 × 0.120	Siding nail 21/2 × 0.120	Siding nail 21/2 × 0.120	Siding nailh 11/2 × 0.120	Siding nail 11/2 × 0.120	Siding nail 11/2 × 0.120
Insulated vinyl sidingj	Insulated vinyl sidingj	0.035 (vinyl siding layer only)	Lap	0.120 nail (shank) with a 0.313 head or 16-gage crownh, i	0.120 nail (shank) with a 0.313 head or 16-gage crownh	0.120 nail (shank) with a 0.313 head or 16-gage crownh	0.120 nail (shank) with a 0.313 head Section R703.11.2	Not allowed	16 inches on center or specified by manufacturer instructions, test report or other sections of this code
Particleboard panels	Particleboard panels	3/8	—	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	Not allowed	6 panel edges 12 inter. sup.
Particleboard panels	Particleboard panels	1/2	—	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)
Particleboard panels	Particleboard panels	5/8	—	6d box nail (2 × 0.099)	8d box nail (21/2 × 0.113)	8d box nail (21/2 × 0.113)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)	6d box nail (2 × 0.099)
Polypropylene sidingk	Polypropylene sidingk	Not applicable	Lap	Section 703.14.1	Section 703.14.1	Section 703.14.1	Section 703.14.1	Not allowed	As specified by the manufacturer instructions, test report or other sections of this code

(continued)

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TABLE R703.3(1)—continued SIDING MINIMUM ATTACHMENT AND MINIMUM THICKNESS

SIDING MATERIAL		NOMINAL THICKNESS (inches)	JOINT TREATMENT	TYPE OF SUPPORTS FOR THE SIDING MATERIAL AND FASTENERS
SIDING MATERIAL	SIDING MATERIAL	NOMINAL THICKNESS (inches)	JOINT TREATMENT	Wood or wood structural panel sheathing into stud	Fiberboard sheathing into stud	Gypsum sheathing into stud	Foam plastic sheathing into studl	Direct to studs	Number or spacing of fasteners
Steelc	Steelc	29 ga.	Lap	Siding nail (13/4 × 0.113) Staple–13/4	Siding nail (23/4 × 0.113) Staple–21/2	Siding nail (21/2 × 0.113) Staple–21/4	Siding nail (13/4 x 0.113) Staple–13/4	Not allowed	Same as stud spacing
Vinyl siding (see Section R703.11)	Vinyl siding (see Section R703.11)	0.035	Lap	0.120 nail (shank) with a 0.313 head or 16-gage staple with 3/8- to1/2-inch crownh, i	0.120 nail (shank) with a 0.313 head or 16-gage staple with 3/8- to1/2-inch crownh	0.120 nail (shank) with a 0.313 head or 16- gage staple with 3/8- to1/2-inch crownh	0.120 nail (shank) with a 0.313 head Section R703.11.2	Not allowed	16 inches on center or as specified by the manufacturer instructions or test report
Wood siding (see Section R703.5)	Wood rustic, drop	3/8 min.	Lap	6d box or siding nail (2 × 0.099)	6d box or siding nail (2 × 0.099)	6d box or siding nail (2 × 0.099)	6d box or siding nail (2 × 0.099)	8d box or siding nail (21/2 × 0.113) Staple–2	Face nailing up to 6 widths, 1 nail per bearing; 8 widths and over, 2 nails per bearing
Wood siding (see Section R703.5)	Shiplap	19/32 average	Lap	Lap	Lap	Lap	Lap	Lap	Lap
Wood siding (see Section R703.5)	Bevel	7/16	7/16	7/16	7/16	7/16	7/16	7/16	7/16
Wood siding (see Section R703.5)	Butt tip	3/16	Lap	Lap	Lap	Lap	Lap	Lap	Lap
Wood structural panel ANSI/APA PRP-210 siding (exterior grade) (see Section R703.5)	Wood structural panel ANSI/APA PRP-210 siding (exterior grade) (see Section R703.5)	3/8 –1/2	Note e	2 × 0.099 siding nail	21/2 × 0.113 siding nail	21/2 × 0.113 siding nail	21/2 × 0.113 siding nail	2 × 0.099 siding nail	6 panel edges 12 inter. sup.
Wood structural panel lap siding (see Section R703.5)	Wood structural panel lap siding (see Section R703.5)	3/8 –1/2	Note e Note g	2 × 0.099 siding nail	21/2 × 0.113 siding nail	21/2 × 0.113 siding nail	21/2 × 0.113 siding nail	2 × 0.099 siding nail	8 along bottom edge

For SI: 1 inch = 25.4 mm. a. Aluminum nails shall be used to attach aluminum siding. b. Aluminum (0.019 inch) shall be unbacked only where the maximum panel width is 10 inches and the maximum flat area is 8 inches. The tolerance for

aluminum siding shall be +0.002 inch of the nominal dimension. c. Shall be of approved type. d. Where used to resist shear forces, the spacing must be 4 inches at panel edges and 8 inches on interior supports. e. Vertical end joints shall occur at studs and shall be covered with a joint cover or shall be caulked. f. Face nailing: one 6d common nail through the overlapping planks at each stud. Concealed nailing: one 11-gage 1 ¹ /2 -inch-long galv. roofing nail through the top edge of each plank at each stud in accordance with the manufacturer’s installation instructions. g. Vertical joints, if staggered, shall be permitted to be away from studs if applied over wood structural panel sheathing. h. Minimum fastener length must be sufficient to penetrate sheathing other nailable substrate and framing a total of a minimum of 1 ¹ /4 inches or in accordance

with the manufacturer’s installation instructions. i. Where specified by the manufacturer’s instructions and supported by a test report, fasteners are permitted to penetrate into or fully through nailable sheathing or other nailable substrate of minimum thickness specified by the instructions or test report, without penetrating into framing. j. Insulated vinyl siding shall comply with ASTM D7793. k. Polypropylene siding shall comply with ASTM D7254. l. Cladding attachment over foam sheathing shall comply with the additional requirements and limitations of Sections R703.15, R703.16 and R703.17.

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TABLE R703.3(2) SCREW FASTENER SUBSTITUTION FOR SIDING ATTACHMENT TO COLD-FORMED STEEL

LIGHT FRAME CONSTRUCTION ^{a, b, c, d, e}

TABLE R703.3.2 LIMITS FOR ATTACHMENT PER TABLE R703.3(1)
MAXIMUM MEAN ROOF HEIGHT	MAXIMUM MEAN ROOF HEIGHT	MAXIMUM MEAN ROOF HEIGHT	MAXIMUM MEAN ROOF HEIGHT
Ultimate Wind Speed (mph 3-second gust)	Exposure	Exposure	Exposure
Ultimate Wind Speed (mph 3-second gust)	B	C	D
115	NL	50	20
120	NL	30	DR
130	60	15	DR
140	35	DR	DR

For SI: 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s. NL = Not Limited by Table R703.3.2, DR = Design Required.

R703.3.4 Minimum fastener length and penetration. Fasteners shall have the greater of the minimum length specified in Table R703.3(1) or as required to provide a minimum penetration into framing as follows:

Fasteners for horizontal aluminum siding, steel siding, particleboard panel siding, wood structural panel siding in accordance with ANSI/APA-PRP 210, fiber-cement panel siding and fiber-cement lap siding installed over foam plastic sheathing shall penetrate not less than 1 ¹ /2 inches (38 mm) into framing or shall be in accordance with the manufacturer’s installation instructions.
Fasteners for hardboard panel and lap siding shall penetrate not less than 1 ¹ /2 inches (38 mm) into framing.
Fasteners for vinyl siding and insulated vinyl siding installed over wood or wood structural panel sheathing shall penetrate not less than 1 ¹ /4 inches (32 mm) into sheathing and framing combined. Vinyl siding and insulated vinyl siding shall be permitted to be installed

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galvanized, stainless steel or rust-preventative coated nails or staples in accordance with Table R703.3(1) or with other approved corrosion-resistant fasteners in accordance with the wall covering manufacturer’s installation instructions. Nails and staples shall comply with ASTM F1667. Nails shall be T-head, modified round head, or round head with smooth or deformed shanks. Staples shall have a minimum crown width of ⁷ /16 inch (11.1 mm) outside diameter and be manufactured of minimum 16-gage wire. Where fiberboard, gypsum, or foam plastic sheathing backing is used, nails or staples shall be driven into the studs. Where wood or wood structural panel sheathing is used, fasteners shall be driven into studs unless otherwise permitted to be driven into sheathing in accordance with either the siding manufacturer’s installation instructions or Table R703.3.3.

For SI: 1 inch = 25.4 mm a. Screws shall comply with ASTM C1513 and shall penetrate a minimum

of three threads through minimum 33 mil (20 gage) cold-formed steel frame construction. b. Screw head diameter shall be not less than the nail head diameter required

by Table R703.3(1). c. Number and spacing of screw fasteners shall comply with Table R703.3(1). d. Pan head, hex washer head, modified truss head or other screw head types

with a flat attachment surface under the head shall be used for vinyl siding attachment. e. Aluminum siding shall not be fastened directly to cold-formed steel light

frame construction.

R703.3.1 Soffit installation. Soffits shall comply with Section R703.3.1.1, Section R703.3.1.2 or the manufacturer’s installation instructions.

R703.3.1.1 Wood structural panel soffit. The minimum nominal thickness for wood structural panel soffits shall be ³ /8 inch (9.5 mm) and shall be fastened to framing or nailing strips with 2-inch by 0.099-inch (51 mm × 2.5 mm) nails. Fasteners shall be in spaced not less than 6 inches (152 mm) on center at panel edges and 12 inches (305 mm) on center at intermediate supports.

R703.3.1.2 Vinyl soffit panels. Soffit panels shall be fastened at fascia and wall ends and to intermediate nailing strips as necessary to ensure that there is no unsupported span greater than 16 inches (406 mm), or as specified by the manufacturer’s instructions.

R703.3.2 Wind limitations. Where the design wind pressure exceeds 30 psf or where the limits of Table R703.3.2 are exceeded, the attachment of wall coverings and soffits shall be designed to resist the component and cladding loads specified in Table R301.2(2) for walls, adjusted for height and exposure in accordance with Table R301.2(3). For the determination of wall covering and soffit attachment, component and cladding loads shall be determined using an effective wind area of 10 square feet (0.93 m ² ).

R703.3.3 Fasteners. Exterior wall coverings and roof overhang soffits shall be securely fastened with aluminum,

TABLE R703.3.3 OPTIONAL SIDING ATTACHMENT SCHEDULE FOR FASTENERS WHERE NO STUD PENETRATION NECESSARY

APPLICATION	NUMBER AND TYPE OF FASTENER	SPACING OF FASTENERSb
Exterior wall covering (weighing 3 psf or less) attachment to wood structural panel sheathing, either direct or over foam sheathing a maximum of 2 inches thick.a Note: Does not apply to vertical siding.	Ring shank roofing nail (0.120 min. dia.)	12 o.c.
Exterior wall covering (weighing 3 psf or less) attachment to wood structural panel sheathing, either direct or over foam sheathing a maximum of 2 inches thick.a Note: Does not apply to vertical siding.	Ring shank nail (0.148 min. dia.)	15 o.c.
Exterior wall covering (weighing 3 psf or less) attachment to wood structural panel sheathing, either direct or over foam sheathing a maximum of 2 inches thick.a Note: Does not apply to vertical siding.	No. 6 screw (0.138 min. dia.)	12 o.c.
Exterior wall covering (weighing 3 psf or less) attachment to wood structural panel sheathing, either direct or over foam sheathing a maximum of 2 inches thick.a Note: Does not apply to vertical siding.	No. 8 screw (0.164 min. dia.)	16 o.c.

For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.479 kPa. a. Fastener length shall be sufficient to penetrate the back side of the wood structural panel sheathing by at least ¹ /4 inch. The wood structural panel sheathing

shall be not less than ⁷ /16 inch in thickness. b. Spacing of fasteners is per 12 inches of siding width. For other siding widths, multiply “Spacing of Fasteners” above by a factor of 12/s, where “s” is the

siding width in inches. Fastener spacing shall never be greater than the manufacturer’s minimum recommendations.

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with fasteners penetrating into or through wood or wood structural sheathing of minimum thickness as specified by the manufacturer’s instructions or test report, with or without penetration into the framing. Where the fastener penetrates fully through the sheathing, the end of the fastener shall extend not less than ¹ /

4 ^{inch (6.4 mm) beyond the opposite face of the sheath-} ing. Fasteners for vinyl siding and insulated vinyl siding installed over foam plastic sheathing shall be in accordance with Section R703.11.2. Fasteners for vinyl siding and insulated vinyl siding installed over fiberboard or gypsum sheathing shall penetrate not less than 1 ¹ /4 inches (32 mm) into framing.

Fasteners for vertical or horizontal wood siding shall penetrate not less than 1 ¹ /2 inches (38 mm) into studs, studs and wood sheathing combined, or blocking.
Fasteners for siding material installed over foam plastic sheathing shall have sufficient length to accommodate foam plastic sheathing thickness and to penetrate framing or sheathing and framing combined, as specified in Items 1 through 4.

R703.4 Flashing.¶

Approved corrosion-resistant flashing shall be applied shingle-fashion in a manner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. Self-adhered membranes used as flashing shall comply with AAMA 711. Fluid-applied membranes used as flashing in exterior walls shall comply with AAMA 714. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at the following locations:

Exterior window and door openings. Flashing at exterior window and door openings shall extend to the surface of the exterior wall finish or to the water-resistive barrier complying with Section 703.2 for subsequent drainage. Mechanically attached flexible flashings shall comply with AAMA 712. Flashing at exterior window and door openings shall be installed in accordance with one or more of the following:

1.1. The fenestration manufacturer’s installation and flashing instructions, or for applications not addressed in the fenestration manufacturer’s instructions, in accordance with the flashing manufacturer’s instructions. Where flashing instructions or details are not provided, pan flashing shall be installed at the sill of exterior window and door openings. Pan flashing shall be sealed or sloped in such a manner as to direct water to the surface of the exterior wall finish or to the waterresistive barrier for subsequent drainage. Openings using pan flashing shall incorporate flashing or protection at the head and sides.

1.2. In accordance with the flashing design or method of a registered design professional.

1.3. In accordance with other approved methods.

At the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings.
Under and at the ends of masonry, wood or metal copings and sills.
Continuously above all projecting wood trim.
Where exterior porches, decks or stairs attach to a wall or floor assembly of wood-frame construction.
At wall and roof intersections.
At built-in gutters.

R703.5 Wood, hardboard and wood structural panel sid-ing.¶

ing. Wood, hardboard, and wood structural panel siding shall be installed in accordance with this section and Table R703.3(1). Hardboard siding shall comply with CPA/ANSI A135.6. Hardboard siding used as architectural trim shall comply with CPA/ANSI A 135.7.

R703.5.1 Vertical wood siding. Wood siding applied vertically shall be nailed to horizontal nailing strips or blocking set not more than 24 inches (610 mm) on center.

R703.5.2 Panel siding. Three-eighths-inch (9.5 mm) wood structural panel siding shall not be applied directly to studs spaced more than 16 inches (406 mm) on center where long dimension is parallel to studs. Wood structural panel siding ⁷ /16 inch (11.1 mm) or thinner shall not be applied directly to studs spaced more than 24 inches (610 mm) on center. The stud spacing shall not exceed the panel span rating provided by the manufacturer unless the panels are installed with the face grain perpendicular to the studs or over sheathing approved for that stud spacing.

Joints in wood, hardboard or wood structural panel siding shall be made as follows unless otherwise approved. Vertical joints in panel siding shall occur over framing members, unless wood or wood structural panel sheathing is used, and shall be shiplapped or covered with a batten. Horizontal joints in panel siding shall be lapped not less than 1 inch (25 mm) or shall be shiplapped or flashed with Z-flashing and occur over solid blocking, wood or wood structural panel sheathing.

R703.5.3 Horizontal wood siding. Horizontal lap siding shall be installed in accordance with the manufacturer’s recommendations. Where there are no recommendations the siding shall be lapped not less than 1 inch (25 mm), or 1/2 inch (12.7 mm) if rabbeted, and shall have the ends caulked, covered with a batten or sealed and installed over a strip of flashing.

R703.6 Wood shakes and shingles.¶

Wood shakes and shingles shall conform to CSSB.

R703.6.1 Application. Wood shakes or shingles shall be applied either single course or double course over nominal 1/2-inch (12.7 mm) wood-based sheathing or to furring strips over ¹ /2-inch (12.7 mm) nominal nonwood sheathing. A water-resistive barrier shall be provided over all sheathing, with horizontal overlaps in the membrane of not less than 2 inches (51 mm) and vertical overlaps of not less than 6 inches (152 mm). Where horizontal furring strips are used, they shall be 1 inch by 3 inches or 1 inch by 4 inches (25 mm by 76 mm or 25 mm by 102 mm) and shall be fastened to the studs with minimum 7d or 8d box nails and shall be spaced a distance on center equal to the actual weather exposure of

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the shakes or shingles, not to exceed the maximum exposure specified in Table R703.6.1. When installing shakes or shingles over a nonpermeable water-resistive barrier, furring strips shall be placed first vertically over the barrier and in addition, horizontal furring strips shall be fastened to the vertical furring strips prior to attaching the shakes or shingles to the horizontal furring strips. The spacing between adjacent shingles to allow for expansion shall be ¹ /8 inch (3.2 mm) to ¹ /4 inch (6.4 mm) apart, and between adjacent shakes shall be ³ /8 inch (9.5 mm) to ¹ /2 inch (12.7 mm) apart. The offset spacing between joints in adjacent courses shall be not less than 1 ¹ /2 inches (38 mm).

TABLE R703.6.1 MAXIMUM WEATHER EXPOSURE FOR WOOD SHAKES

AND SHINGLES ON EXTERIOR WALLS ^{a, b, c}

(Dimensions are in inches)

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strips by not less than ¹ /2 inch (13 mm) and shall not be overdriven. Fasteners for untreated (natural) and treated products shall comply with ASTM F1667.

R703.6.4 Bottom courses. The bottom courses shall be doubled.

R703.7 Exterior plaster (stucco).¶

Installation of exterior plaster shall be in compliance with ASTM C926, ASTM C1063 and the provisions of this code.

R703.7.1 Lath. Lath and lath attachments shall be of corrosion-resistant materials. Expanded metal or woven wire lath shall be attached with 1 ¹ /2-inch-long (38 mm), 11gage nails having a ⁷ /16-inch (11.1 mm) head, or ⁷ /8-inchlong (22.2 mm), 16-gage staples, spaced not more than 6 inches (152 mm) or as otherwise approved.

Exception: Lath is not required over masonry, cast-inplace concrete, precast concrete or stone substrates prepared in accordance with ASTM C1063.

R703.7.2 Plaster. Plastering with cement plaster shall be in accordance with ASTM C926. Cement materials shall be in accordance with one of the following:

Masonry cement conforming to ASTM C91 Type M, S or N.
Portland cement conforming to ASTM C150 Type I, II, or III.
Blended hydraulic cement conforming to ASTM C595 Type IP, IS (< 70), IL, or IT (S < 70).
Hydraulic cement conforming to ASTM C1157 Type GU, HE, MS, HS, or MH.
Plastic (stucco) cement conforming to ASTM C1328.

Plaster shall be not less than three coats where applied over metal lath or wire lath and shall be not less than two coats where applied over masonry, concrete, pressure-preservative-treated wood or decay-resistant wood as specified in Section R317.1 or gypsum backing. If the plaster surface is completely covered by veneer or other facing material or is completely concealed, plaster application need be only two coats, provided the total thickness is as set forth in Table R702.1(1).

On wood-frame construction with an on-grade floor slab system, exterior plaster shall be applied to cover, but not extend below, lath, paper and screed.

The proportion of aggregate to cementitious materials shall be as set forth in Table R702.1(3).

R703.7.2.1 Weep screeds. A minimum 0.019-inch (0.5 mm) (No. 26 galvanized sheet gage), corrosion-resistant weep screed or plastic weep screed, with a minimum vertical attachment flange of 3 ¹ /2 inches (89 mm), shall be provided at or below the foundation plate line on exterior stud walls in accordance with ASTM C926. The weep screed shall be placed not less than 4 inches (102 mm) above the earth or 2 inches (51 mm) above paved areas and shall be of a type that will allow trapped water to drain to the exterior of the building. The weather-resistant barrier shall lap the attachment flange. The exterior lath shall cover and terminate on the attachment flange of the weep screed.

LENGTH	EXPOSURE FOR SINGLE COURSE	EXPOSURE FOR DOUBLE COURSE
Shinglesa	Shinglesa	Shinglesa
16	7	12b
18	8	14c
24	101/2	16d
Shakesa	Shakesa	Shakesa
18	8	14
24	101/2	18

For SI: 1 inch = 25.4 mm. a. Dimensions given are for No. 1 grade. b. A maximum 9-inch exposure is permitted for No. 2 grade. c. A maximum 10-inch exposure is permitted for No. 2 grade. d. A maximum 14-inch exposure is permitted for No. 2 grade.

R703.6.2 Weather exposure. The maximum weather exposure for shakes and shingles shall not exceed that specified in Table 703.6.1.

R703.6.3 Attachment. Wood shakes or shingles shall be installed according to this chapter and the manufacturer’s instructions. Each shake or shingle shall be held in place by two stainless steel Type 304, Type 316 or hot-dipped zinccoated galvanized corrosion-resistant box nails in accordance with Table R703.6.3(1) or R703.6.3(2). The hotdipped zinc-coated galvanizing shall be in compliance with ASTM A153, 1.0 ounce per square foot. Alternatively, 16gage stainless steel Type 304 or Type 316 staples with crown widths ⁷ /16 inch (11 mm) minimum, ³ /4 inch (19 mm) maximum, shall be used and the crown of the staple shall be placed parallel with the butt of the shake or the shingle. In single-course application, the fasteners shall be concealed by the course above and shall be driven approximately 1 inch (25 mm) above the butt line of the succeeding course and ³ /4 inch (19 mm) from the edge. In double-course applications, the exposed shake or shingle shall be face-nailed with two fasteners, driven approximately 2 inches (51 mm) above the butt line and ³ /4 inch (19 mm) from each edge. Fasteners installed within 15 miles (24 km) of salt water coastal areas shall be stainless steel Type 316. Fasteners for fire-retardant-treated shakes or shingles in accordance with Section R902 or pressureimpregnated-preservative-treated shakes or shingles in accordance with AWPA U1 shall be stainless steel Type 316. The fasteners shall penetrate the sheathing or furring

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TABLE R703.6.3(1) SINGLE-COURSE SIDEWALL FASTENERS
SINGLE-COURSE SIDEWALL FASTENERS	SINGLE-COURSE SIDEWALL FASTENERS	SINGLE-COURSE SIDEWALL FASTENERS	SINGLE-COURSE SIDEWALL FASTENERS
Product type	Nail type and minimum length (inches)	Minimum head diameter (inches)	Minimum shank thickness (inches)
R & R and sanded shingles	R & R and sanded shingles	R & R and sanded shingles	R & R and sanded shingles
16 and 18 shingles	3d box 11/4	0.19	0.08
24 shingles	4d box 11/2	0.19	0.08
Grooved shingles	Grooved shingles	Grooved shingles	Grooved shingles
16 and 18 shingles	3d box 11/4	0.19	0.08
24 shingles	4d box 11/2	0.19	0.08
Split and sawn shakes	Split and sawn shakes	Split and sawn shakes	Split and sawn shakes
18 straight-split shakes	5d box 13/4	0.19	0.08
18 and 24 handsplit shakes	6d box 2	0.19	0.0915
24 tapersplit shakes	5d box 13/4	0.19	0.08
18 and 24 tapersawn shakes	6d box 2	0.19	0.0915

For SI: 1 inch = 25.4 mm.

TABLE R703.6.3(2) DOUBLE-COURSE SIDEWALL FASTENERS
DOUBLE-COURSE SIDEWALL FASTENERS	DOUBLE-COURSE SIDEWALL FASTENERS	DOUBLE-COURSE SIDEWALL FASTENERS	DOUBLE-COURSE SIDEWALL FASTENERS
Product type	Nail type and minimum length (inches)	Minimum head diameter (inches)	Minimum shank thickness (inches)
R & R and sanded shingles	R & R and sanded shingles	R & R and sanded shingles	R & R and sanded shingles
16, 8 and 24 shingles	5d box 13/4 or same size casing nails	0.19	0.08
Grooved shingles	Grooved shingles	Grooved shingles	Grooved shingles
16, 18 and 24shingles	5d box 13/4	0.19	0.08
Split and sawn shakes	Split and sawn shakes	Split and sawn shakes	Split and sawn shakes
18 straight-split shakes	7d box 21/4 or 8d 21/2	0.19	0.099
18 and 24 handsplit shakes	7d box 21/4 or 8d 21/2	0.19	0.099
24 tapersplit shakes	7d box 21/4 or 8d 21/2	0.19	0.099
18 and 24 tapersawn shakes	7d box 21/4 or 8d 21/2	0.19	0.099

For SI: 1 inch = 25.4 mm.

R703.7.3 Water-resistive barriers. Water-resistive barriers shall be installed as required in Section R703.2 and, where applied over wood-based sheathing, shall include a water-resistive, vapor-permeable barrier with a performance at least equivalent to two layers of Grade D paper. The individual layers shall be installed independently such that each layer provides a separate continuous plane and any flashing, installed in accordance with Section R703.4 and intended to drain to the water-resistive barrier, is directed between the layers.

Exception: Where the water-resistive barrier that is applied over wood-based sheathing has a water resistance equal to or greater than that of 60-minute Grade D paper and is separated from the stucco by an intervening, substantially nonwater-absorbing layer or designed drainage space.

R703.7.4 Application. Each coat shall be kept in a moist condition for at least 48 hours prior to application of the next coat.

Exception: Applications installed in accordance with ASTM C926.

R703.7.5 Curing. The finish coat for two-coat cement plaster shall not be applied sooner than seven days after application of the first coat. For three-coat cement plaster, the second coat shall not be applied sooner than 48 hours after application of the first coat. The finish coat for threecoat cement plaster shall not be applied sooner than seven days after application of the second coat.

R703.8 Anchored stone and masonry veneer, general.¶

Anchored stone and masonry veneer shall be installed in accordance with this chapter, Table R703.3(1) and Figure R703.8. These veneers installed over a backing of wood or cold-formed steel shall be limited to the first story above grade plane and shall not exceed 5 inches (127 mm) in thickness. See Section R602.10 for wall bracing requirements for masonry veneer for wood-framed construction and Section R603.9.5 for wall bracing requirements for masonry veneer for cold-formed steel construction.

Exceptions:

For buildings in Seismic Design Categories A, B and C, exterior stone or masonry veneer, as specified in Table R703.8(1), with a backing of wood or

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steel framing shall be permitted to the height specified in Table R703.8(1) above a noncombustible foundation.

For detached one- or two-family dwellings in Seismic Design Categories D0, D1 and D2, exterior stone or masonry veneer, as specified in Table R703.8(2), with a backing of wood framing shall be permitted to the height specified in Table R703.8(2) above a noncombustible foundation.

R703.8.1 Interior veneer support. Veneers used as interior wall finishes shall be permitted to be supported on wood or cold-formed steel floors that are designed to support the loads imposed.

R703.8.2 Exterior veneer support. Except in Seismic Design Categories D0, D1 and D2, exterior masonry veneers having an installed weight of 40 pounds per square foot (195 kg/m ² ) or less shall be permitted to be

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supported on wood or cold-formed steel construction. Where masonry veneer supported by wood or cold-formed steel construction adjoins masonry veneer supported by the foundation, there shall be a movement joint between the veneer supported by the wood or cold-formed steel construction and the veneer supported by the foundation. The wood or cold-formed steel construction supporting the masonry veneer shall be designed to limit the deflection to 1/600 of the span for the supporting members. The design of the wood or cold-formed steel construction shall consider the weight of the veneer and any other loads.

R703.8.2.1 Support by steel angle. A minimum 6-inch by 4-inch by ⁵ /16-inch (152 mm by 102 mm by 8 mm) steel angle, with the long leg placed vertically, shall be anchored to double 2-inch by 4-inch (51 mm by 102 mm) wood studs or double 350S162 cold-formed steel studs at a maximum on-center spacing of 16 inches (406 mm). Anchorage of the steel angle at every double stud

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spacing shall be not less than two ⁷ /16-inch-diameter (11 mm) by 4-inch (102 mm) lag screws for wood construction or two ⁷ /16-inch (11.1 mm) bolts with washers for cold-formed steel construction. The steel angle shall have a minimum clearance to underlying construction of 1/16 inch (1.6 mm). Not less than two-thirds the width of the masonry veneer thickness shall bear on the steel angle. Flashing and weep holes shall be located in the masonry veneer in accordance with Figure R703.8.2.1. The maximum height of masonry veneer above the steel angle support shall be 12 feet 8 inches (3861 mm). The

backing shall be in accordance with Sections R703.8.4 and R703.8.4.2. The method of support for the masonry veneer on wood construction shall be constructed in accordance with Figure R703.8.2.1.

The maximum slope of the roof construction without stops shall be 7:12. Roof construction with slopes greater than 7:12 but not more than 12:12 shall have stops of a minimum 3-inch by 3-inch by ¹ /4-inch (76 mm by 76 mm by 6.4 mm) steel plate welded to the angle at 24 inches (610 mm) on center along the angle or as approved by the building official.

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TABLE R703.8(1) STONE OR MASONRY VENEER LIMITATIONS AND REQUIREMENTS, WOOD OR STEEL FRAMING, SEISMIC DESIGN CATEGORIES A, B AND C

SEISMIC DESIGN CATEGORY	NUMBER OF WOOD- OR STEEL- FRAMED STORIES	MAXIMUM HEIGHT OF VENEER ABOVE NONCOMBUSTIBLE FOUNDATIONa (feet)	MAXIMUM NOMINAL THICKNESS OF VENEER (inches)	MAXIMUM WEIGHT OF VENEER (psf)b	WOOD- OR STEEL- FRAMED STORY
A or B	Steel: 1 or 2 Wood: 1, 2 or 3	30	5	50	all
C	1	30	5	50	1 only
C	2	30	5	50	top
C	2	30	5	50	bottom
C	Wood only: 3	30	5	50	top
C	Wood only: 3	30	5	50	middle
C	Wood only: 3	30	5	50	bottom

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.479 kPa. a. An additional 8 feet is permitted for gable end walls. See also story height limitations of Section R301.3. b. Maximum weight is installed weight and includes weight of mortar, grout, lath and other materials used for installation. Where veneer is placed on both faces

of a wall, the combined weight shall not exceed that specified in this table.

TABLE R703.8(2) STONE OR MASONRY VENEER LIMITATIONS AND REQUIREMENTS,

ONE-	AND TWO-FAMILY DETA	ACHED DWELLINGS, SEISMIC DESIGN	CATEGORIES D0, D1 AND	D2
SEISMIC DESIGN CATEGORY	NUMBER OF WOOD- FRAMED STORIESa	MAXIMUM HEIGHT OF VENEER ABOVE NONCOMBUSTIBLE FOUNDATION OR FOUNDATION WALL (feet)	MAXIMUM NOMINAL THICKNESS OF VENEER (inches)	MAXIMUM WEIGHT OF VENEER (psf)b
D0	1	20c	4	40
D0	2	20c	4	40
D0	3	30d	4	40
D1	1	20c	4	40
D1	2	20c	4	40
D1	3	20c	4	40
D2	1	20c	3	30
D2	2	20c	3	30

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.479 kPa, 1 pound-force = 4.448 N. a. Cripple walls are not permitted in Seismic Design Categories D0, D1 and D2. b. Maximum weight is installed weight and includes weight of mortar, grout and lath, and other materials used for installation. c. The veneer shall not exceed 20 feet in height above a noncombustible foundation, with an additional 8 feet permitted for gable end walls, or 30 feet in height with

an additional 8 feet for gable end walls where the lower 10 feet have a backing of concrete or masonry wall. See story height limitations of Section R301.3. d. The veneer shall not exceed 30 feet in height above a noncombustible foundation, with an additional 8 feet permitted for gable end walls. See story height

limitations of Section R301.3.

R703.8.2.2 Support by roof construction. A steel angle shall be placed directly on top of the roof construction. The roof supporting construction for the steel angle shall consist of not fewer than three 2-inch by 6-inch (51 mm by 152 mm) wood members for wood construction or three 550S162 cold-formed steel members for coldformed steel light frame construction. A wood member abutting the vertical wall stud construction shall be anchored with not fewer than three ⁵ /8-inch (15.9 mm) diameter by 5-inch (127 mm) lag screws to every wood stud spacing. Each additional wood roof member shall be anchored by the use of two 10d nails at every wood stud spacing. A cold-formed steel member abutting the vertical wall stud shall be anchored with not fewer than nine No. 8 screws to every cold-formed steel stud. Each additional cold-formed steel roof member shall be anchored to the adjoining roof member using two No. 8 screws at

o every wood stud spacing. Each additional wood roof member shall be anchored by the use of two 10d nails at every wood stud spacing. A cold-formed steel member abutting the vertical wall stud shall be anchored with not fewer than nine No. 8 screws to every cold-formed steel stud. Each additional cold-formed steel roof member shall be anchored to the adjoining roof member using two No. 8 screws at

every stud spacing. Not less than two-thirds the width of the masonry veneer thickness shall bear on the steel angle. Flashing and weep holes shall be located in the masonry veneer wythe in accordance with Figure R703.8.2.2. The maximum height of the masonry veneer above the steel angle support shall be 12 feet 8 inches (3861 mm). The airspace separating the masonry veneer from the wood backing shall be in accordance with Sections R703.8.4 and R703.8.4.2. The support for the masonry veneer shall be constructed in accordance with Figure R703.8.2.2.

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R703.8.3 Lintels. Masonry veneer shall not support any vertical load other than the dead load of the veneer above. Veneer above openings shall be supported on lintels of noncombustible materials. The lintels shall have a length of bearing not less than 4 inches (102 mm). Steel lintels shall be shop coated with a rust-inhibitive paint, except for lintels made of corrosionresistant steel or steel treated with coatings to provide corrosion resistance. Construction of openings shall comply with either Section R703.8.3.1 or 703.8.3.2.

R703.8.3.1 Allowable span. The allowable span shall not exceed the values set forth in Table R703.8.3.1.

R703.8.3.2 Maximum span. The allowable span shall not exceed 18 feet 3 inches (5562 mm) and shall be constructed to comply with Figure R703.8.3.2 and the following:

Provide a minimum length of 18 inches (457 mm) of masonry veneer on each side of opening as shown in Figure R703.8.3.2.
Provide a minimum 5-inch by 3 ¹ /2-inch by ⁵ /16inch (127 mm by 89 mm by 7.9 mm) steel angle above the opening and shore for a minimum of 7 days after installation.
Provide double-wire joint reinforcement extending 12 inches (305 mm) beyond each side of the opening. Lap splices of joint reinforcement not less than 12 inches (305 mm). Comply with one of the following:

3.1. Double-wire joint reinforcement shall be 3/16-inch (4.8 mm) diameter and shall be placed in the first two bed joints above the opening.

3.2. Double-wire joint reinforcement shall be 9 gauge (0.144 inch or 3.66 mm diameter) and shall be placed in the first three bed joints above the opening.

Provide the height of masonry veneer above opening, in accordance with Table R703.8.3.2.

R703.8.4 Anchorage. Masonry veneer shall be anchored to the supporting wall studs with corrosion-resistant metal ties embedded in mortar or grout and extending into the

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veneer a minimum of 1 ¹ /2 inches (38 mm), with not less than ⁵ /8-inch (15.9 mm) mortar or grout cover to outside face. Masonry veneer shall conform to Table R703.8.4(1). For masonry veneer tie attachment through insulating sheathing not greater than 2 inches (51 mm) in thickness to not less than 7/16 performance category wood structural panel, see Table R703.8.4(2).

TABLE R703.8.3.2 HEIGHT OF MASONRY VENEER ABOVE OPENING

MINIMUM HEIGHT OF MASONRY VENEER ABOVE OPENING (INCH)	MAXIMUM HEIGHT OF MASONRY VENEER ABOVE OPENING (FEET)
13	< 5
24	5 to < 12
60	12 to height above support allowed by Section R703.8

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

TABLE R703.8.3.1 ALLOWABLE SPANS FOR LINTELS SUPPORTING MASONRY VENEER ^{a, b, c, d}

SIZE OF STEEL ANGLEa, c, d (inches)	NO STORY ABOVE	ONE STORY ABOVE	TWO STORIES ABOVE	NO. OF 1/-INCH OR EQUIVALENT 2 REINFORCING BARS IN REINFORCED LINTELb, d
3 × 3 × 1/4	6-0	4-6	3-0	1
4 × 3 × 1/4	8-0	6-0	4-6	1
5 × 31/2× 5/16	10-0	8-0	6-0	2
6 × 31/2 × 5/16	14-0	9-6	7-0	2
2-6 × 31/2× 5/16	20-0	12-0	9-6	4

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. a. Long leg of the angle shall be placed in a vertical position. b. Depth of reinforced lintels shall be not less than 8 inches and all cells of hollow masonry lintels shall be grouted solid. Reinforcing bars shall extend not less

than 8 inches into the support. c. Steel members indicated are adequate typical examples; other steel members meeting structural design requirements shall be permitted to be used. d. Either steel angle or reinforced lintel shall span opening.

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R703.8.4.1 Size and spacing. Veneer ties, if strand wire, shall be not less in thickness than No. 9 U.S. gage

[(0.148 inch) (4 mm)] wire and shall have a hook embedded in the mortar joint, or if sheet metal, shall be not less than No. 22 U.S. gage by [(0.0299 inch) (0.76 mm)] ⁷ /8 inch (22 mm) corrugated. Each tie shall support not more than 2.67 square feet (0.25 m ² ) of wall area and shall be spaced not more than 32 inches (813 mm) on center horizontally and 24 inches (635 mm) on center vertically.

Exception: In Seismic Design Category D0, D1 or D2 or townhouses in Seismic Design Category C or in wind areas of more than 30 pounds per square foot pressure (1.44 kPa), each tie shall support not more than 2 square feet (0.2 m ² ) of wall area.

R703.8.4.1.1 Veneer ties around wall openings. Additional metal ties shall be provided around wall openings greater than 16 inches (406 mm) in either dimension. Metal ties around the perimeter of openings shall be spaced not more than 3 feet (9144 mm) on center and placed within 12 inches (305 mm) of the wall opening.

R703.8.4.2 Grout fill. As an alternative to the airspace required by Table R703.8.4, grout shall be permitted to fill the airspace. Where the airspace is filled with grout, a water-resistive barrier is required over studs or sheathing. Where the airspace is filled, replacing the sheathing and water-resistive barrier with a wire mesh and approved water-resistive barrier or an approved waterresistive barrier-backed reinforcement attached directly to the studs is permitted.

R703.8.5 Flashing. Flashing shall be located beneath the first course of masonry above finished ground level above the foundation wall or slab and at other points of support, including structural floors, shelf angles and lintels where masonry veneers are designed in accordance with Section R703.8. See Section R703.4 for additional requirements.

R703.8.6 Weepholes. Weepholes shall be provided in the outside wythe of masonry walls at a maximum spacing of 33 inches (838 mm) on center. Weepholes shall be not less than ³ /16 inch (5 mm) in diameter. Weepholes shall be located immediately above the flashing.

R703.9 Exterior insulation and finish system (EIFS)/EIFS with drainage.¶

with drainage. Exterior insulation and finish systems (EIFS) shall comply with this chapter and Section R703.9.1. EIFS with drainage shall comply with this chapter and Section R703.9.2.

R703.9.1 Exterior insulation and finish systems (EIFS). EIFS shall comply with the following:

ASTM E2568.
EIFS shall be limited to applications over substrates of concrete or masonry wall assemblies.
Flashing of EIFS shall be provided in accordance with the requirements of Section R703.4.
EIFS shall be installed in accordance with the manufacturer’s instructions.
EIFS shall terminate not less than 6 inches (152 mm) above the finished ground level.
Decorative trim shall not be face-nailed through the EIFS.

R703.9.2 Exterior insulation and finish system (EIFS) with drainage. EIFS with drainage shall comply with the following:

ASTM E2568.
EIFS with drainage shall be required over all wall assemblies with the exception of substrates of concrete or masonry wall assemblies.
EIFS with drainage shall have an average minimum drainage efficiency of 90 percent when tested in accordance with ASTM E2273.
The water-resistive barrier shall comply with Section R703.2 or ASTM E2570.
The water-resistive barrier shall be applied between the EIFS and the wall sheathing.
Flashing of EIFS with drainage shall be provided in accordance with the requirements of Section R703.4.
EIFS with drainage shall be installed in accordance with the manufacturer’s instructions.
EIFS with drainage shall terminate not less than 6 inches (152 mm) above the finished ground level.
Decorative trim shall not be face-nailed through the EIFS with drainage.

TABLE R703.8.4(1) TIE ATTACHMENT AND AIRSPACE REQUIREMENTS

BACKING AND TIE	MINIMUM TIE	MINIMUM TIE FASTENERa	AIRSPACEc
Wood stud backing with corrugated sheet metal	22 U.S. gage (0.0299 in.) ×7/8 in. wide	8d common nailb (21/2 in. × 0.131 in.)	Nominal 1 in. between sheathing and veneer	Nominal 1 in. between sheathing and veneer
Wood stud backing with metal strand wire	W1.7 (No. 9 U.S. gage; 0.148 in.) with hook embedded in mortar joint	8d common nailb (21/2 in. × 0.131 in.)	Minimum nominal 1 in. between sheath- ing and veneer	Maximum 41/2 in. between backing and veneer
Cold-formed steel stud backing with adjustable metal strand wire	W1.7 (No. 9 U.S. gage; 0.148 in.) with hook embedded in mortar joint	No. 10 screw extending through the steel framing a minimum of three exposed threads	Minimum nominal 1 in. between sheath- ing and veneer	Maximum 41/2 in. between backing and veneer

For SI: 1 inch = 25.4 mm. a. In Seismic Design Category D0, D1 or D2, the minimum tie fastener shall be an 8d ring-shank nail (2 ¹ /2 in. 0.131 in.) or a No. 10 screw extending through the

steel framing a minimum of three exposed threads. b. All fasteners shall have rust-inhibitive coating suitable for the installation in which they are being used, or be manufactured from material not susceptible to corrosion. c. An airspace that provides drainage shall be permitted to contain mortar from construction.

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REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	140 mph V Ultimate	Zone 5, Exposure D	—	12/12	12/12	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	140 mph V Ultimate	Zone 5, Exposure C	—	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	140 mph V Ultimate	Zone 5, Exposure B	12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	130 mph V Ultimate	Zone 5, Exposure D	—	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	130 mph V Ultimate	Zone 5, Exposure C	12/12	16/12, 12/16, 12/12	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	130 mph V Ultimate	Zone 5, Exposure B	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	115 mph V Ultimate	Zone 5, Exposure D	12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	115 mph V Ultimate	Zone 5, Exposure C	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	115 mph V Ultimate	Zone 5, Exposure B	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	110 mph V Ultimate	Zone 5, Exposure D	12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	110 mph V Ultimate	Zone 5, Exposure C	16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
REQUIRED BRICK-TIE SPACING (VERTICAL-TIE SPACING/HORIZONTAL-TIE SPACING) (inches/inches)	110 mph V Ultimate	Zone 5, Exposure B	16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12	24/16, 16/24, 16/16, 16/12, 12/16, 12/12
SIZE (DIA. OR SCREW #)	SIZE (DIA. OR SCREW #)	SIZE (DIA. OR SCREW #)	0.091	0.148	#6	#8	#10	#14
FASTENER TYPEd	FASTENER TYPEd	FASTENER TYPEd	Ring Shank Nails	Ring Shank Nails	Screws	Screws	Screws	Screws

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R703.10 Fiber cement siding.¶

R703.10.1 Panel siding. Fiber-cement panels shall comply with the requirements of ASTM C1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Panels shall be installed with the long dimension either parallel or perpendicular to framing. Vertical and horizontal joints shall occur over framing members and shall be protected with caulking, or with battens or flashing, or be vertical or horizontal shiplap, or otherwise designed to comply with Section R703.1. Panel siding shall be installed with fasteners in accordance with Table R703.3(1) or the approved manufacturer’s instructions.

R703.10.2 Lap siding. Fiber-cement lap siding having a maximum width of 12 inches (305 mm) shall comply with the requirements of ASTM C1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Lap siding shall be lapped a minimum of 1 ¹ /4 inches (32 mm) and lap siding not having tongue-and-groove end joints shall have the ends protected with caulking, covered with an H-section joint cover, located over a strip of flashing, or shall be designed to comply with Section R703.1. Lap siding courses shall be installed with the fastener heads exposed or concealed, in accordance with Table R703.3(1) or approved manufacturer’s instructions.

R703.11 Vinyl siding.¶

Vinyl siding shall be certified and labeled as conforming to the requirements of ASTM D3679 by an approved quality control agency.

R703.11.1 Installation. Vinyl siding, soffit and accessories shall be installed in accordance with the manufacturer’s instructions.

R703.11.1.1 Fasteners. Unless specified otherwise by the manufacturer’s instructions, fasteners for vinyl siding shall be 0.120-inch (3 mm) shank diameter nail with a 0.313-inch (8 mm) head or 16-gage staple with a 3/8-inch (9.5 mm) to 1/2-inch (12.7 mm) crown.

R703.11.1.2 Penetration depth. Unless specified otherwise by the manufacturer’s instructions, fasteners shall penetrate into building framing. The total penetration into sheathing, furring framing or other nailable substrate shall be a minimum 1 ¹ /4 inches (32 mm). Where specified by the manufacturer’s instructions and supported by a test report, fasteners are permitted to penetrate into or fully through nailable sheathing or other nailable substrate of minimum thickness specified by the instructions or test report without penetrating into framing. Where the fastener penetrates fully through the sheathing, the end of the fastener shall extend a minimum of ¹ /4 inch (6.4 mm) beyond the opposite face of the sheathing or nailable substrate.

R703.11.1.3 Spacing. Unless specified otherwise by the manufacturer’s instructions, the maximum spacing between fasteners for horizontal siding shall be 16 inches (406 mm), and for vertical siding 12 inches (305 mm) both horizontally and vertically. Where specified by the manufacturer’s instructions and supported by a test report, greater fastener spacing is permitted.

R703.11.2 Installation over foam plastic sheathing. Where vinyl siding or insulated vinyl siding is installed over foam plastic sheathing, the vinyl siding shall comply with Section R703.11 and shall have a design wind pressure resistance in accordance with Table R703.11.2.

Exceptions:

Where the foam plastic sheathing is applied directly over wood structural panels, fiberboard, gypsum sheathing or other approved backing capable of independently resisting the design wind pressure, the vinyl siding shall be installed in accordance with Sections R703.3.3 and R703.11.1.
Where the vinyl siding manufacturer’s product specifications provide an approved design wind pressure rating for installation over foam plastic sheathing, use of this design wind pressure rating shall be permitted and the siding shall be installed in accordance with the manufacturer’s installation instructions.
Where the foam plastic sheathing and its attachment have a design wind pressure resistance complying with Sections R316.8 and R301.2.1, the vinyl siding shall be installed in accordance with Sections R703.3.3 and R703.11.1.

R703.12 Adhered masonry veneer installation.¶

Adhered masonry veneer shall comply with the requirements of Section R703.7.3 and the requirements in Sections 12.1 and 12.3 of TMS 402. Adhered masonry veneer shall be installed in accordance with Section R703.7.1, Article 3.3C of TMS 602 or the manufacturer’s instructions.

R703.12.1 Clearances. On exterior stud walls, adhered masonry veneer shall be installed:

Minimum of 4 inches (102 mm) above the earth;
Minimum of 2 inches (51 mm) above paved areas; or
Minimum of ¹ /2 inch (12.7 mm) above exterior walking surfaces that are supported by the same foundation that supports the exterior wall.

R703.12.2 Flashing at foundation. A corrosion-resistant screed or flashing of a minimum 0.019-inch (0.48 mm) or 26-gage galvanized or plastic with a minimum vertical attachment flange of 3 ¹ /2 inches (89 mm) shall be installed to extend a minimum of 1 inch (25 mm) below the foundation plate line on exterior stud walls in accordance with Section R703.4.

R703.12.3 Water-resistive barrier. A water-resistive barrier shall be installed as required by Section R703.2 and shall comply with the requirements of Section R703.7.3. The water-resistive barrier shall lap over the exterior of the attachment flange of the screed or flashing provided in accordance with Section R703.12.2.

mm) both horizontally and vertically. Where specified R703.13 Insulated vinyl siding. Insulated vinyl siding shall

be certified and labeled as conforming to the requirements of

by the manufacturer’s instructions and supported by a test report, greater fastener spacing is permitted. ASTM D7793 by an approved quality control agency.

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TABLE R703.11.2 ADJUSTED MINIMUM DESIGN WIND PRESSURE REQUIREMENT FOR VINYL SIDING

ULTIMATE DESIGN WIND SPEED (MPH)	ADJUSTED MINIMUM DESIGN WIND PRESSURE (ASD) (PSF)a, b
ULTIMATE DESIGN WIND SPEED (MPH)	Case 1: With interior gypsum wallboardc	Case 1: With interior gypsum wallboardc	Case 1: With interior gypsum wallboardc	Case 2: Without interior gypsum wallboardc	Case 2: Without interior gypsum wallboardc	Case 2: Without interior gypsum wallboardc
ULTIMATE DESIGN WIND SPEED (MPH)	Exposure	Exposure	Exposure	Exposure	Exposure	Exposure
ULTIMATE DESIGN WIND SPEED (MPH)	B	C	D	B	C	D
110	-44.0	-61.6	-73.1	-62.9	-88.1	-104.4
115	-49.2	-68.9	-81.7	-70.3	-98.4	-116.7
120	-51.8	-72.5	-86.0	-74.0	-103.6	-122.8
130	-62.2	-87.0	-103.2	-88.8	-124.3	-147.4
> 130	Not Allowedd	Not Allowedd	Not Allowedd	Not Allowedd	Not Allowedd	Not Allowedd

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square foot = 0.0929 m ², 1 mile per hour = 0.447 m/s, 1 pound per square foot = 0.0479 kPa. a. Linear interpolation is permitted. b. The table values are based on a maximum 30-foot mean roof height, and effective wind area of 10 square feet Wall Zone 5 (corner), and the ASD design wind

pressure from Table R301.2(2) multiplied by the following adjustment factors: 2.6 (Case 1) and 3.7 (Case 2) for wind speeds less than 130 mph and 3.7 (Case 2) for wind speeds greater than 130 mph. c. Gypsum wallboard, gypsum panel product or equivalent. d. For the indicated wind speed condition, foam sheathing only on the exterior of frame walls with vinyl siding is not allowed unless the vinyl siding complies

with an adjusted minimum design wind pressure requirement as determined in accordance with Note b and the wall assembly is capable of resisting an impact without puncture at least equivalent to that of a wood frame wall with minimum ⁷ /16-inch OSB sheathing as tested in accordance with ASTM E1886.

R703.13.1 Insulated vinyl siding and accessories. Insulated vinyl siding and accessories shall be installed in accordance with the manufacturer’s installation instructions.

R703.14 Polypropylene siding.¶

Polypropylene siding shall be certified and labeled as conforming to the requirements of ASTM D7254, and those of Section R703.14.2 or Section R703.14.3, by an approved quality control agency.

R703.14.1 Polypropylene siding and accessories. Polypropylene siding and accessories shall be installed in accordance with manufacturer’s installation instructions.

R703.14.1.1 Installation. Polypropylene siding shall be installed over and attached to wood structural panel sheathing with minimum thickness of ⁷ /16 inch (11.1 mm), or other substrate, composed of wood or woodbased material and fasteners having equivalent withdrawal resistance.

R703.14.1.2 Fastener requirements. Unless otherwise specified in the approved manufacturer’s instructions, nails shall be corrosion resistant, with a minimum 0.120inch (3 mm) shank and minimum 0.313-inch (8 mm) head diameter. Nails shall be a minimum of 1 ¹ /4 inches (32 mm) long or as necessary to penetrate sheathing or substrate not less than ³ /4 inch (19.1 mm). Where the nail fully penetrates the sheathing or nailable substrate, the end of the fastener shall extend not less than ¹ /4 inch (6.4 mm) beyond the opposite face of the sheathing or substrate. Staples are not permitted.

R703.14.2 Fire separation. Polypropylene siding shall not be installed on walls with a fire separation distance of less than 5 feet (1524 mm) and walls closer than 10 feet (3048 mm) to a building on another lot.

Exception: Walls perpendicular to the line used to determine the fire separation distance.

R703.14.3 Flame spread index. The certification of the flame spread index shall be accompanied by a test report stating that all portions of the test specimen ahead of the

flame front remained in position during the test in accordance with ASTM E84 or UL 723.

R703.15 Cladding attachment over foam sheathing to wood framing.¶

wood framing. Cladding shall be specified and installed in accordance with Section R703, the cladding manufacturer’s approved instructions, including any limitations for use over foam plastic sheathing, or an approved design. In addition, the cladding or furring attachments through foam sheathing to framing shall meet or exceed the minimum fastening requirements of Section R703.15.1, Section R703.15.2, or an approved design for support of cladding weight.

Exceptions:

Where the cladding manufacturer has provided approved installation instructions for application over foam sheathing, those requirements shall apply.
For exterior insulation and finish systems, refer to Section R703.9.
For anchored masonry or stone veneer installed over foam sheathing, refer to Section R703.8.

R703.15.1 Direct attachment. Where cladding is installed directly over foam sheathing without the use of furring, cladding minimum fastening requirements to support the cladding weight shall be as specified in Table R703.15.1.

R703.15.2 Furred cladding attachment. Where wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table R703.15.2. Where placed horizontally, wood furring shall be preservative-treated wood in accordance with Section R317.1 or naturally durable wood and fasteners shall be corrosion resistant in accordance Section R317.3.

R703.16 Cladding attachment over foam sheathing to cold-formed steel framing.¶

cold-formed steel framing. Cladding shall be specified and installed in accordance with Section R703, the cladding manufacturer’s approved instructions, including any limitations

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for use over foam plastic sheathing, or an approved design. In addition, the cladding or furring attachments through foam sheathing to framing shall meet or exceed the minimum fastening requirements of Section R703.16.1, Section R703.16.2 or an approved design for support of cladding weight.

Exceptions:

Where the cladding manufacturer has provided approved installation instructions for application over foam sheathing, those requirements shall apply.
For exterior insulation and finish systems, refer to Section R703.9.
For anchored masonry or stone veneer installed over foam sheathing, refer to Section R703.8.

R703.16.1 Direct attachment. Where cladding is installed directly over foam sheathing without the use of furring, cladding minimum fastening requirements to support the cladding weight shall be as specified in Table R703.16.1.

R703.16.2 Furred cladding attachment. Where steel or wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table R703.16.2. Where placed horizontally, wood furring shall be preservative-treated wood in accordance with Section R317.1 or naturally durable wood and fasteners shall be corrosion resistant in accordance with Section R317.3. Steel furring shall have a minimum G60 galvanized coating.

R703.17 Cladding attachment over foam sheathing to masonry or concrete wall construction.¶

masonry or concrete wall construction. Cladding shall be specified and installed in accordance with Section 703.3 and the cladding manufacturer’s instructions or an approved design. Foam sheathing shall be attached to masonry or concrete construction in accordance with the insulation manufacturer’s installation instructions or an approved design. Furring and furring attachments through foam sheathing into concrete or masonry substrate shall be designed to resist design loads determined in accordance with Section R301, including support of cladding weight as applicable. Fasteners used to attach cladding or furring through foam sheathing to masonry or concrete substrates shall be approved for application into masonry or concrete material and shall be installed in accordance with the fastener manufacturer’s instructions.

Exceptions:

Where the cladding manufacturer has provided approved installation instructions for application over foam sheathing and connection to a masonry or concrete substrate, those requirements shall apply.
For exterior insulation and finish systems, refer to Section R703.9.
For anchored masonry or stone veneer installed over foam sheathing, refer to Section R703.8.

TABLE R703.15.1 CLADDING MINIMUM FASTENING REQUIREMENTS FOR DIRECT ATTACHMENT

OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHT ^a

CLADDING FASTENER THROUGH FOAM SHEATHING	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	MAXIMUM THICKNESS OF FOAM SHEATHINGc (inches)
CLADDING FASTENER THROUGH FOAM SHEATHING	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	24 o.c. Fastener Horizontal Spacing	24 o.c. Fastener Horizontal Spacing	24 o.c. Fastener Horizontal Spacing	24 o.c. Fastener Horizontal Spacing
CLADDING FASTENER THROUGH FOAM SHEATHING	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:
CLADDING FASTENER THROUGH FOAM SHEATHING	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	3 psf	11 psf	18 psf	25 psf	3 psf	11 psf	18 psf	25 psf
Wood framing (minimum 11/4-inch penetration)	0.113 diameter nail	6	2.00	1.45	0.75	DR	2.00	0.85	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.113 diameter nail	8	2.00	1.00	DR	DR	2.00	0.55	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.113 diameter nail	12	2.00	0.55	DR	DR	1.85	DR	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.120 diameter nail	6	3.00	1.70	0.90	0.55	3.00	1.05	0.50	DR
Wood framing (minimum 11/4-inch penetration)	0.120 diameter nail	8	3.00	1.20	0.60	DR	3.00	0.70	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.120 diameter nail	12	3.00	0.70	DR	DR	2.15	DR	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.131 diameter nail	6	4.00	2.15	1.20	0.75	4.00	1.35	0.70	DR
Wood framing (minimum 11/4-inch penetration)	0.131 diameter nail	8	4.00	1.55	0.80	DR	4.00	0.90	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.131 diameter nail	12	4.00	0.90	DR	DR	2.70	0.50	DR	DR
Wood framing (minimum 11/4-inch penetration)	0.162 diameter nail	6	4.00	3.55	2.05	1.40	4.00	2.25	1.25	0.80
Wood framing (minimum 11/4-inch penetration)	0.162 diameter nail	8	4.00	2.55	1.45	0.95	4.00	1.60	0.85	0.50
Wood framing (minimum 11/4-inch penetration)	0.162 diameter nail	12	4.00	1.60	0.85	0.50	4.00	0.95	DR	DR

For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa. DR = Design Required. o.c. = On Center. a. Wood framing shall be Spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with AWC NDS. b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths. c. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.

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TABLE R703.15.2 FURRING MINIMUM FASTENING REQUIREMENTS FOR APPLICATION OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHT ^{a, b}

FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZE	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	MAXIMUM THICKNESS OF FOAM SHEATHINGd (inches)
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZE	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	16 o.c. Furringe	16 o.c. Furringe	16 o.c. Furringe	16 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZE	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	Siding Weight:	Siding Weight:	Siding Weight:	Siding Weight:	Siding Weight:	Siding Weight:	Siding Weight:	Siding Weight:
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZE	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	3 psf	11 psf	18 psf	25 psf	3 psf	11 psf	18 psf	25 psf
Minimum 1 wood furringc	Minimum 2 wood stud	0.131 diameter nail	11/4	8	4.00	2.45	1.45	0.95	4.00	1.60	0.85	DR
Minimum 1 wood furringc	Minimum 2 wood stud	0.131 diameter nail	11/4	12	4.00	1.60	0.85	DR	4.00	0.95	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	0.131 diameter nail	11/4	16	4.00	1.10	DR	DR	3.05	0.60	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	0.162 diameter nail	11/4	8	4.00	4.00	2.45	1.60	4.00	2.75	1.45	0.85
Minimum 1 wood furringc	Minimum 2 wood stud	0.162 diameter nail	11/4	12	4.00	2.75	1.45	0.85	4.00	1.65	0.75	DR
Minimum 1 wood furringc	Minimum 2 wood stud	0.162 diameter nail	11/4	16	4.00	1.90	0.95	DR	4.00	1.05	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	No.10 wood screw	1	12	4.00	2.30	1.20	0.70	4.00	1.40	0.60	DR
Minimum 1 wood furringc	Minimum 2 wood stud	No.10 wood screw	1	16	4.00	1.65	0.75	DR	4.00	0.90	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	No.10 wood screw	1	24	4.00	0.90	DR	DR	2.85	DR	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	1/4 lag screw	11/2	12	4.00	2.65	1.50	0.90	4.00	1.65	0.80	DR
Minimum 1 wood furringc	Minimum 2 wood stud	1/4 lag screw	11/2	16	4.00	1.95	0.95	0.50	4.00	1.10	DR	DR
Minimum 1 wood furringc	Minimum 2 wood stud	1/4 lag screw	11/2	24	4.00	1.10	DR	DR	3.25	0.50	DR	DR

For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa. DR = Design Required. o.c. = On Center. a. Wood framing and furring shall be Spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with AWC NDS. b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths. c. Where the required cladding fastener penetration into wood material exceeds ³ /4 inch and is not more than 1 ¹ /2 inches, a minimum 2 wood furring or an

approved design shall be used. d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289. e. Furring shall be spaced not more than 24 inches on center, in a vertical or horizontal orientation. In a vertical orientation, furring shall be located over wall

studs and attached with the required fastener spacing. In a horizontal orientation, the indicated 8-inch and 12-inch fastener spacing in furring shall be achieved by use of two fasteners into studs at 16 inches and 24 inches on center, respectively.

TABLE R703.16.1 CLADDING MINIMUM FASTENING REQUIREMENTS FOR DIRECT ATTACHMENT

OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHT ^a

CLADDING FASTENER THROUGH FOAM SHEATHING INTO:	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	MAXIMUM THICKNESS OF FOAM SHEATHINGc (inches)
CLADDING FASTENER THROUGH FOAM SHEATHING INTO:	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	16 o.c. Fastener Horizontal Spacing	24" o.c. Fastener Horizontal Spacing	24" o.c. Fastener Horizontal Spacing	24" o.c. Fastener Horizontal Spacing	24" o.c. Fastener Horizontal Spacing
CLADDING FASTENER THROUGH FOAM SHEATHING INTO:	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:
CLADDING FASTENER THROUGH FOAM SHEATHING INTO:	CLADDING FASTENER TYPE AND MINIMUM SIZEb	CLADDING FASTENER VERTICAL SPACING (inches)	3 psf	11 psf	18 psf	25 psf	3 psf	11 psf	18 psf	25 psf
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 8 screw into 33-mil steel or thicker	6	3.00	2.95	2.20	1.45	3.00	2.35	1.25	DR
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 8 screw into 33-mil steel or thicker	8	3.00	2.55	1.60	0.60	3.00	1.80	DR	DR
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 8 screw into 33-mil steel or thicker	12	3.00	1.80	DR	DR	3.00	0.65	DR	DR
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 33-mil steel	6	4.00	3.50	2.70	1.95	4.00	2.90	1.70	0.55
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 33-mil steel	8	4.00	3.10	2.05	1.00	4.00	2.25	0.70	DR
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 33-mil steel	12	4.00	2.25	0.70	DR	3.70	1.05	DR	DR
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 43-mil steel or thicker	6	4.00	4.00	4.00	3.60	4.00	4.00	3.45	2.70
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 43-mil steel or thicker	8	4.00	4.00	3.70	3.00	4.00	3.85	2.80	1.80
Steel framing (minimum penetration of steel thickness + 3 threads)	No. 10 screw into 43-mil steel or thicker	12	4.00	3.85	2.80	1.80	4.00	3.05	1.50	DR

For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa. DR = Design Required. o.c. = On Center. a. Steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel, and 50 ksi steel for 54 mil steel or thicker. b. Screws shall comply with the requirements of ASTM C1513. c. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.

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TABLE R703.16.2 FURRING MINIMUM FASTENING REQUIREMENTS FOR APPLICATION OVER FOAM PLASTIC

SHEATHING TO SUPPORT CLADDING WEIGHT ^a

FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZEb	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	MAXIMUM THICKNESS OF FOAM SHEATHINGd (inches)
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZEb	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	16 o.c. Furringe	16 o.c. Furringe	16 o.c. Furringe	16 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe	24 o.c. Furringe
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZEb	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:	Cladding Weight:
FURRING MATERIAL	FRAMING MEMBER	FASTENER TYPE AND MINIMUM SIZEb	MINIMUM PENETRATION INTO WALL FRAMING (inches)	FASTENER SPACING IN FURRING (inches)	3 psf	11 psf	18 psf	25 psf	3 psf	11 psf	18 psf	25 psf
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 8 screw	Steel thickness + 3 threads	12	3.00	1.80	DR	DR	3.00	0.65	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 8 screw	Steel thickness + 3 threads	16	3.00	1.00	DR	DR	2.85	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 8 screw	Steel thickness + 3 threads	24	2.85	DR	DR	DR	2.20	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 10 screw	Steel thickness + 3 threads	12	4.00	2.25	0.70	DR	3.70	1.05	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 10 screw	Steel thickness + 3 threads	16	3.85	1.45	DR	DR	3.40	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	33-mil steel stud	No. 10 screw	Steel thickness + 3 threads	24	3.40	DR	DR	DR	2.70	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 8 Screw	Steel thickness + 3 threads	12	3.00	1.80	DR	DR	3.00	0.65	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 8 Screw	Steel thickness + 3 threads	16	3.00	1.00	DR	DR	2.85	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 8 Screw	Steel thickness + 3 threads	24	2.85	DR	DR	DR	2.20	DR	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 10 screw	Steel thickness + 3 threads	12	4.00	3.85	2.80	1.80	4.00	3.05	1.50	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 10 screw	Steel thickness + 3 threads	16	4.00	3.30	1.95	0.60	4.00	2.25	DR	DR
Minimum 33-mil steel furring or minimum 1 wood furringc	43-mil or thicker steel stud	No. 10 screw	Steel thickness + 3 threads	24	4.00	2.25	DR	DR	4.00	0.65	DR	DR

For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa. DR = Design Required. o.c. = On Center. a. Wood furring shall be Spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater. Steel furring shall be minimum 33-ksi steel. Steel

studs shall be minimum 33-ksi steel for 33-mil and 43-mil thickness, and 50-ksi steel for 54-mil steel or thicker. b. Screws shall comply with the requirements of ASTM C1513. c. Where the required cladding fastener penetration into wood material exceeds ³ /4 inch and is not more than 1 ¹ /2 inches, a minimum 2-inch nominal wood

furring or an approved design shall be used. d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289. e. Furring shall be spaced not more than 24 inches (610 mm) on center, in a vertical or horizontal orientation. In a vertical orientation, furring shall be located

over wall studs and attached with the required fastener spacing. In a horizontal orientation, the indicated 8-inch and 12-inch fastener spacing in furring shall be achieved by use of two fasteners into studs at 16 inches and 24 inches on center, respectively.

440 2019 CALIFORNIA RESIDENTIAL CODE

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CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE