Los Angeles Municipal Code Div. 15 Roof Assemblies and Rooftop Structures

(Title Amended by Ord. No. 188,797, Eff. 12/31/25.)

Section

• 91.1500 Basic Provisions.

• 91.1505 Fire Classification.

• 91.1507 Requirements for Roof Coverings.

• 91.1511 Rooftop Structures.

• 91.1512 Reroofing.

Chapter 15 of the CBC is adopted by reference with the following exceptions, modifications and additions:

Section 1505 of the CBC is adopted by reference, except Sections 1505.1, 1505.6 and 1505.7 of the CBC are not adopted and in lieu, Section 91.1505.1 is added.

91.1505.1. General. (Amended by Ord. No. 188,797, Eff. 12/31/25.) Fire classification of roof assemblies shall be in accordance with Section 1505 of the CBC. The minimum fire classification of roof assemblies installed on buildings shall comply with Table 1505.1 based on type of construction of the building. Class A, B and C roof assemblies and roof coverings required to be listed by this section shall be tested in accordance with ASTM E108 or UL 790.

EXCEPTION: Skylights and sloped glazing shall comply with Division 24, Article 1, Chapter IX of the LAMC.

No wood shake or wood shingle roof covering is permitted anywhere in the City.

(Amended by Ord. No. 187,719, Eff. 1/23/23.)

Section 1507 of the CBC is adopted by reference, except Table 1507.3.7 of the CBC is not adopted and, in lieu, Los Angeles Municipal Code Table 1507.3.7 is added.

TABLE 1507.3.7

CLAY AND CONCRETE TILE ATTACHMENT a, b, c

(Amended by Ord. No. 188,797, Eff. 12/31/25.)

GENERAL – CLAY OR CONCRETE ROOF TILE

INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS d, e (Installations on solid sheathing with battens)

INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS (Installations on solid sheathing without battens)

For SI: one inch = 25.4 mm, one foot = 304.8 mm, one mile per hour = 0.447 m/s, one pound per square foot= 4.882 kg/m2.

a Minimum fastener size. Hot dipped galvanized ring shank or other corrosion-resistant nails not less than No. 11 gage with 5/16-inch head. Fasteners shall be long enough to penetrate into the sheathing 0.75 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 and shall be copper, brass or stainless steel.

b Snow areas. A minimum of 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. Battens shall be not less than one-inch by two-inch nominal. Provisions shall be made for drainage by a minimum of 1/8-inch riser at each nail or by four-foot-long battens with at least a 0.5-inch separation between battens. Horizontal battens are required for slopes over 7:12.

e Perimeter fastening areas include three tile courses but not less than 36 inches from either side of hips or ridges and edges of eaves and gable rakes.

f V asd shall be determined in accordance with CBC Section 1609.3.1.

(Added by Ord. No. 188,797, Eff. 12/31/25.)

Section 1511 of the CBC is adopted by reference.

(Added by Ord. No. 188,797, Eff. 12/31/25.)

Section 1512 of the CBC is adopted by reference, except CBC Sections 1512.3 and 1512.3.1 are not adopted and, in lieu, Los Angeles Municipal Code Subsections 91.1512.3 and 91.1512.3.1 are added.

91.1512.3. Roof Recover. The installation of a new roof covering over an existing roof covering shall be permitted where any of the following conditions occur:

1. Where the new roof covering is installed in accordance with the roof covering manufacturer’s approved instructions.

2. Complete and separate roofing systems, such as standing-seam metal roof panel systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings.

3. The application of a new protective coating over an existing spray polyurethane foam roofing system shall be permitted without tear off of existing roof coverings.

EXCEPTION: A roof recover shall not be permitted where any of the following conditions occur:

1. The existing roof or roof covering is water-soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing.

2. The existing roof covering is slate, clay, cement or asbestos-cement tile.

3. The existing roof has two or more applications of any type of roof covering.

91.1512.3.1. Roof Recovering. Roof covering may be applied over existing roofing in accordance with the Los Angeles Municipal Code Table 91.1512.3.1.

TABLE 91.1512.3.1 ALLOWABLE REROOFS OVER EXISTING ROOFING

NP = Not Permitted.

Note: (Minimum Roof Slope)