Construction Practices & Fastening

Grounded in the retrieved California Building Code — click a citation to read the verbatim passage:

• CBC § 0.35 High relevance — show source text

  Where the specific gravity of the wood species used for roof framing is greater than or equal to 0.35 but less than 0.42 in accordance with AWC NDS, fastening of roof
  sheathing shall be with RSRS-03 (21/2″ × 0.131″ × 0.281″ head) nails unless alternative fastening is designed in accordance with AWC NDS. Where the specific gravity of the wood
  species used for roof framing is less than 0.35, fastening of the roof sheathing shall be designed in accordance with AWC NDS.
  f. Fastening is only permitted where the basic wind speed,V, is less than or equal to 110 mph and where fastening is to wood framing of a species with specific gravity greater
  than or equal to 0.42 in accordance with AWC NDS.
  g. Nails and staples are carbon steel meeting the specifications of ASTM F1667. Connections using nails and staples of other materials, such as stainless steel, shall be designed
  by acceptable engineering practice or approved under Section 104.2.3.|For SI: 1 inch = 25.4 mm.
  a. Nails spaced at 6 inches at intermediate supports where spans are 48 inches or more. For nailing of wood structural panel and particleboard diaphragms and shear walls, refer
  to Section 2305. Nails for wall sheathing are permitted to be common, box or casing.
  b. Spacing shall be 6 inches on center on the edges and 12 inches on center at intermediate supports for nonstructural applications. Panel supports at 16 inches (20 inches if
  strength axis in the long direction of the panel, unless otherwise marked).
  c. Where a rafter is fastened to an adjacent parallel ceiling joist in accordance with this schedule and the ceiling joist is fastened to the top plate in accordance with this schedule,
  the number of toenails in the rafter shall be permitted to be reduced by one nail.
  d. RSRS is a Roof Sheathing Ring Shank nail meeting the specifications in ASTM F1667.
  e. Tabulated fastener requirements apply where the basic wind speed,V, is less than 140 mph. For wood structural panel roof sheathing attached to gable-end roof framing and
  to intermediate supports within 48 inches of roof edges and ridges, nails shall be spaced at 4 inches on center where the basic wind speed,V, is greater than 130 mph in Expo-
  sure B or greater than 110 mph in Exposure C. Spacing exceeding 6 inches on center at intermediate supports shall be permitted where the fastening is designed per the AWC
  NDS. Where the specific gravity of the wood species used for roof framing is greater than or equal to 0.35 but less than 0.42 in accordance with AWC NDS, fastening of roof
  sheathing shall be with RSRS-03 (21/2″ × 0.131″ × 0.281″ head) nails unless alternative fastening is designed in accordance with AWC NDS. Where the specific gravity of the wood
  species used for roof framing is less than 0.35, fastening of the roof sheathing shall be designed in accordance with AWC NDS.
  f. Fastening is only permitted where the basic wind speed,V, is less than or equal to 110 mph and where fastening is to wood framing of a species with specific gravity greater
  than or equal to 0.42 in accordance with AWC NDS.
  g. Nails and staples are carbon steel meeting the specifications of ASTM F1667.

• CBC § 0-60 High relevance — show source text

  The nose of all ridge, hip and rake tiles shall be set in a bead
  of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips.
  Rake5 tiles shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead
  of roofer’s mastic.| |110|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |120|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |130|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |All|> 60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
  (Installations on solid sheathing without battens)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
  (Installations on solid sheathing without battens)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
  (Installations on solid sheathing without battens)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
  (Installations on solid sheathing without battens)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
  (Installations on solid sheathing without battens)| |Maximum Allow-
  able Stress Wind
  Speed,****Vasd
  f (mph)|Mean roof
  height (feet)|All roof slopes|All roof slopes|All roof slopes| |85|0-60|One fastener per tile.|One fastener per tile.|One fastener per tile.| |100|0-40|One fastener per tile.|One fastener per tile.|One fastener per tile.| |100|> 40-60|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips.

• CBC § 0.5 High relevance — show source text

  (d) Whenever calcium silicate board or gypsum wallboard is specified as a backing substrate in subsequent paragraphs, the material shall be 0.5-inch-thick (13 mm) calcium silicate board supplied in 4 feet by 8 feet (1219 mm by 2438 mm) sheets with a density of 46 lb/ft [3], or 0.625-inch-thick (16 mm) gypsum wallboard “Type X” supplied in 4 feet by 8 feet (1219 mm by 2438 mm) sheets with a density of 42.2 lb/ft [3], and they shall be uncoated. Where metal screws in combination with washers and wing nuts are specified for fastening, they shall be standard 0.25-inch (6 mm) by 20 TPI round head steel machine screws, 0.25-inch (6 mm) by 20 TPI steel wing nuts and 2 inch (51 mm) O.D. by 0.044-inch-thick (1 mm) flat steel washers with a 0.281-inch (7 mm) I.D. hole. Fastening screws shall be installed as shown in Figure 12-8-1B-2. The fastening pattern is shown in Figure 12-8-1B-3 for rigid wall materials and Figure 12-81B-4 for flexible wall materials. The fastening pattern for all ceiling materials is shown in Figure 12-8-1B-5.

  ACOUSTICAL MATERIALS AND OTHER BOARD MATERIALS

  Sec. 12-8-1B.2.

  (a) Depending on the type of field mounting required by the acoustical product, either wood furring strips or metal runners are to be used to support acoustical material.

  (b) Wood furring strips for mounting acoustical materials and other board materials are to be nominal 1-inch by 2-inch (25 mm by 51 mm) wood furring strips and attached to a gypsum wall board substrate to approximately the field installation.

  (c) Metal runners for mounting are to be attached to the 0.625-inch (16 mm) gypsum wallboard substrate to approximate the field suspension systems application.

  BATT OR BLANKET-TYPE INSULATING AND OTHER FLEXIBLE MATERIALS

  Sec. 12-8-1B.3. Batt or blanket and other flexible materials which do not have sufficient rigidity or strength to support themselves are to be supported by round head machine screws in combination with wing nuts and flat washers, as specified in Section 12-8-1B.1 (d), which are inserted through the material in such a way as to fasten the material to a substrate board.

  BUILDING UNITS

  Sec. 12-8-1B.4. Materials falling within this category include organic and/or inorganic materials formed or laminated into blocks, boards, planks, slabs or sheets of various sizes, thicknesses or shapes. If building units have sufficient structural integrity to support themselves, no additional mounting to a substrate board support is required. If the building units are of such construction as to require individual components and are not self-supporting, the component is to be fastened to the substrate board as specified in Section 12-8-1B.1 (d).

  COATINGS OR SPRAY APPLIED MATERIALS

  Sec. 12-8-1B.5.

• CBC § 2306.2 High relevance — show source text

  Fastening along intermediate framing members: Space fasteners not greater than 12 inches on center, except 6 inches on center for spans greater than 32 inches.
  c.
  Panels conforming to DOC PS 1 or PS 2.
  d. This table gives shear values for Cases 1 and 2 as shown in Table 2306.2(1). The values shown are applicable to Cases 3, 4, 5 and 6 as shown in Table 2306.2(1), providing fasten-
  ers at all continuous panel edges are spaced in accordance with the boundary fastener spacing.
  e.
  The minimum nominal depth of framing members shall be 3 inches nominal. The minimum nominal width of framing members not located at boundaries or adjoining panel
  edges shall be 2 inches.
  f.
  Staples shall have a minimum crown width of7/16 inch, and shall be installed with their crowns parallel to the long dimension of the framing members.
  g.
  High-load diaphragms shall be subject to special inspection in accordance with Section 1705.5.1.
  h.
  For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
  i.
  For fastener spacing diagrams see Figure 2306.2(2).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
  a.
  For framing of other species: (1) Find specific gravity for species of framing lumber in ANSI/AWC NDS. (2) For staples, find shear value from table for Structural I panels (regard-
  less of actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
  b. Fastening along intermediate framing members: Space fasteners not greater than 12 inches on center, except 6 inches on center for spans greater than 32 inches.
  c.
  Panels conforming to DOC PS 1 or PS 2.
  d. This table gives shear values for Cases 1 and 2 as shown in Table 2306.2(1). The values shown are applicable to Cases 3, 4, 5 and 6 as shown in Table 2306.2(1), providing fasten-
  ers at all continuous panel edges are spaced in accordance with the boundary fastener spacing.
  e.
  The minimum nominal depth of framing members shall be 3 inches nominal. The minimum nominal width of framing members not located at boundaries or adjoining panel
  edges shall be 2 inches.
  f.
  Staples shall have a minimum crown width of7/16 inch, and shall be installed with their crowns parallel to the long dimension of the framing members.
  g.
  High-load diaphragms shall be subject to special inspection in accordance with Section 1705.5.1.
  h.
  For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
  i.
  For fastener spacing diagrams see Figure 2306.2(2).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
  a.
  For framing of other species: (1) Find specific gravity for species of framing lumber in ANSI/AWC NDS.

• CBC § 7.5 High relevance — show source text

  Only one fastener on slopes of 7:12 and less
  for tiles with installed weight exceeding 7.5 lbs./sq. ft. having a
  width not more than 16 inches.| |100|0-40|0-40|0-40|0-40| |100|> 40-60|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.| |110|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |120|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |130|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |All|> 60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|**INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd,

• CBC § 1404.4.3 High relevance — show source text

  1404.4.3 Masonry. Flashing and weep holes in anchored veneer designed in accordance with Section 1404.7 shall be located not more than 10 inches (245 mm) above finished ground level above the foundation wall or slab. At other points of support including structural floors, shelf angles and lintels, flashing and weep holes shall be located in the first course of masonry above the support.

  14-8 2025 CALIFORNIA BUILDING CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  EXTERIOR WALLS

  [BS] 1404.5 Fastening. Exterior wall coverings shall be securely fastened with corrosion-resistant fasteners in accordance with this code or the approved manufacturer’s instructions. Fastening of claddings or furring through foam plastic insulating sheathing shall comply with Section 1404.5.1, 1404.5.2 or 1404.5.3, as applicable.

  [BS] 1404.5.1 Cladding attachment over foam sheathing to masonry or concrete wall construction. Cladding shall be specified and installed in accordance with this chapter and the cladding manufacturer’s installation 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 shall be designed to resist design loads determined in accordance with Chapter 16, 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 installation instructions.

  Exceptions:

  1. 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.
  2. For exterior insulation and finish systems, refer to Section 1407.
  3. For anchored masonry or stone veneer installed over foam sheathing, refer to Section 1404.

  [BS] 1404.5.2 Cladding attachment over foam sheathing to cold-formed steel framing. Cladding shall be specified and installed in accordance with this chapter and the cladding manufacturer’s approved installation instructions, including any limitations for use over foam plastic sheathing, or an approved design. Where used, furring and furring attachments shall be designed to resist design loads determined in accordance with Chapter 16. In addition, the cladding or furring attachments through foam sheathing to cold-formed steel framing shall meet or exceed the minimum fastening requirements of Sections 1404.5.2.1 and 1404.5.2.2, or an approved design for support of cladding weight.

  Exceptions:

  1. Where the cladding manufacturer has provided approved installation instructions for application over foam sheathing, those requirements shall apply.
  2. For exterior insulation and finish systems, refer to Section 1407.
  3. For anchored masonry or stone veneer installed over foam sheathing, refer to Section 1404.

  [BS] 1404.5.2.1 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 1404.5.2.1.

  **

  **

  |[BS] TABLE 1404.5.2.1—CLADDING MINIMUM FASTENING REQUIREMENTS FOR
  DIRECT ATTACHMENT OVER FOAM

• CBC § 6.3.1. High relevance — show source text

  6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |130|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |All|> 60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)|INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
  (Installations on spaced/solid sheathing with battens or spaced sheathing)| |Maximum Allow-
  able Stress Design
  Wind Speed,****Vasd
  f
  (mph)|Mean roof
  height (feet)|Roof slope < 5:12|Roof slope 5:12 < 12:12|Roof slope 12:12 and over| |85|0-60|Fasteners are not required.
  Tiles with installed weight less
  than 9 lbs./sq. ft. require not
  fewer than one fastener per tile.|One fastener per tile every other
  row. Perimeter tiles require one
  fastener. Tiles with installed weight
  less than 9 lbs./sq. ft. require not
  fewer than one fastener per tile.|One fastener required for
  every tile. Tiles with
  installed weight less than 9
  lbs./sq. ft. require not fewer
  than one fastener per tile.| |100|0-40|0-40|0-40|0-40| |100|> 40-60|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips.
  Rake5 tiles shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead
  of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips.
  Rake5 tiles shall be nailed with two nails.

• CBC § 1705.12.2 Medium relevance — show source text

  1705.12.2 Cold-formed steel light-frame construction. Periodic special inspection is required for welding operations of elements of the main windforce-resisting system. Periodic special inspection is required for screw attachment, bolting, anchoring and other fastening of elements of the main windforce-resisting system, including shear walls, braces, diaphragms, collectors (drag struts) and hold-downs.

  Exception: Special inspections are not required for cold-formed steel light-frame shear walls and diaphragms, including screwing, bolting, anchoring and other fastening to components of the windforce-resisting system, where either of the following applies:

  1. The sheathing is gypsum board or fiberboard.
  2. The sheathing is wood structural panel or steel sheets on only one side of the shear wall, shear panel or diaphragm assembly and the specified fastener spacing at the panel or sheet edges is more than 4 inches (102 mm) on center (o.c.).

  1705.12.3 Wind-resisting components. Periodic special inspection is required for fastening of the following systems and components:

  1. Roof covering, roof deck and roof framing connections.
  2. Exterior wall covering and wall connections to roof and floor diaphragms and framing.

  1705.13 Special inspections for seismic resistance. Special inspections for seismic resistance shall be required as specified in Sections 1705.13.1 through 1705.13.9, unless exempted by the exceptions of Section 1704.2.

  Exception: The special inspections specified in Sections 1705.13.1 through 1705.13.9 are not required for structures designed and constructed in accordance with one of the following:

  1. The structure consists of light-frame construction; the design spectral response acceleration at short periods, S DS, as determined in Section 1613.2.4, does not exceed 0.5; and the building height of the structure does not exceed 35 feet (10 668 mm).
  2. The seismic force-resisting system of the structure consists of reinforced masonry or reinforced concrete; the design spectral response acceleration at short periods, S DS, as determined in Section 1613.2.4, does not exceed 0.5; and the building height of the structure does not exceed 25 feet (7620 mm).
  3. The structure is a detached one- or two-family dwelling not exceeding two stories above grade plane and does not have any of the following horizontal or vertical irregularities in accordance with Section 12.3 of ASCE 7: 3.1. Torsional or extreme torsional irregularity. 3.2. Nonparallel systems irregularity. 3.3. Stiffness-soft story or stiffness-extreme soft story irregularity. 3.4. Discontinuity in lateral strength-weak story irregularity.

  1705.13.1 Structural steel. Special inspections for seismic resistance shall be in accordance with Section 1705.13.1.1 or 1705.13.1.2, as applicable.

  1705.13.1.1 Seismic force-resisting systems. Special inspections of structural steel in the seismic force-resisting systems in buildings and structures assigned to Seismic Design Category B, C, D, E or F shall be performed in accordance with the quality assurance requirements of AISC 341. [OSHPD 1R, 2 & 5] and this code.

• CBC § 0-60 Medium relevance — show source text

  ****Vasd**
  f (mph)|Mean roof
  height (feet)|All roof slopes|All roof slopes|All roof slopes| |85|0-60|One fastener per tile.|One fastener per tile.|One fastener per tile.| |100|0-40|One fastener per tile.|One fastener per tile.|One fastener per tile.| |100|> 40-60|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.|The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. Rake tiles
  shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic.| |110|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |120|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |130|0-60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |All|> 60|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.|The fastening system shall resist the wind forces in Section 1609.6.3.1.| |For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound per square foot = 4.882 kg/m2.
  a. Minimum fastener size. Corrosion-resistant nails not less than No. 11 gage with5/16-inch head. Fasteners shall be long enough to penetrate into the sheathing3/4 inch or
  through the thickness of the sheathing, whichever is less. Attaching wire for clay and concrete tile shall not be smaller than 0.083 inch.
  b. Snow areas. Not fewer than two fasteners per tile are required or battens and one fastener.
  c. Roof slopes greater than 24:12. The nose of all tiles shall be securely fastened.
  d. Horizontal battens.

• CBC § 1507.3 Medium relevance — show source text

  1507.3 Clay and concrete tile. The installation of clay and concrete tile shall comply with the provisions of this section.

  1507.3.1 Deck requirements. Concrete and clay tile shall be installed only over solid sheathing.

  Exception: Spaced lumber sheathing shall be permitted in Seismic Design Categories A, B and C. 1507.3.2 Deck slope. Clay and concrete roof tile shall be installed on roof slopes of 2 [1] / 2 units vertical in 12 units horizontal (21percent slope) or greater. For roof slopes from 2 [1] / 2 units vertical in 12 units horizontal (21-percent slope) to 4 units vertical in 12 units horizontal (33-percent slope), double underlayment application is required in accordance with Section 1507.1.1.

  1507.3.3 Underlayment. Unless otherwise noted, required underlayment shall conform to: ASTM D226, Type II; ASTM D2626 or ASTM D6380, Class M mineral-surfaced roll roofing.

  1507.3.4 Clay tile. Clay roof tile shall comply with ASTM C1167.

  1507.3.5 Concrete tile. Concrete roof tile shall comply with ASTM C1492. 1507.3.6 Fasteners. Tile fasteners shall be corrosion resistant and not less than 11-gage, [0.120 inch (3 mm)], [5] / 16 -inch (8.0 mm) head, and of sufficient length to penetrate the deck not less than [3] / 4 inch (19.1 mm) or through the thickness of the deck, which

  2025 CALIFORNIA BUILDING CODE 15-11

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  ROOF ASSEMBLIES AND ROOFTOP STRUCTURES

  ever is less. Attaching wire for clay or concrete tile shall not be smaller than 0.083 inch (2.1 mm). Perimeter fastening areas include three tile courses but not less than 36 inches (914 mm) from either side of hips or ridges and edges of eaves and gable rakes.

  1507.3.7 Attachment. Clay and concrete roof tiles shall be fastened in accordance with Table 1507.3.7.

  TABLE 1507.3.7—CLAY AND CONCRETE TILE ATTACHMENTa, b, c	Col2	Col3	Col4	Col5
  GENERAL—CLAY OR CONCRETE ROOF TILE	GENERAL—CLAY OR CONCRETE ROOF TILE	GENERAL—CLAY OR CONCRETE ROOF TILE	GENERAL—CLAY OR CONCRETE ROOF TILE	GENERAL—CLAY OR CONCRETE ROOF TILE
  Maximum Allow- able Stress Design Wind Speed,****Vasd f (mph)	Mean roof height (feet)	Roof slope < 3:12	Roof slope 3:12 and over	Roof slope 3:12 and over
  85	0-60	One fastener per tile. Flat tile without vertical laps, two fasteners per tile.	Two fasteners per tile. Only one fastener on slopes of 7:12 and less for tiles with installed weight exceeding 7.5 lbs./sq.