SEC. 91.1300. GENERAL.

   (Amended by Ord. No. 184,692, Eff. 12/30/16.)

   In order to comply with the purpose of this division, buildings shall be designed to comply with the requirements of Part 6, Title 24 of the California Code of Regulations, referred to as the California Energy Code.

SEC. 91.1301. SOLAR ENERGY COLLECTORS.

   Approved collectors which function as building components shall comply with the applicable provisions of the Code.

   Approved collectors located above or upon a roof and not functioning as building components shall not reduce the required fire-resistant or fire-retardant classification of the roof-covering materials.

DIVISION 14 EXTERIOR WALL COVERINGS

(Division Amended by Ord. No. 179,324, Eff. 12/10/07, Oper. 1/1/08.)

Section

91.1400   Basic Provisions.

91.1402   Performance Requirements.

SEC. 91.1400. BASIC PROVISIONS.

   Chapter 14 of the CBC is adopted by reference with the following exceptions, modifications and additions:

SEC. 91.1402. PERFORMANCE REQUIREMENTS.

   (Renumbered and Amended by Ord. No. 186,488, Eff. 12/27/19.)

   Section 1402 of the CBC is adopted by reference, except Section 1402.3 of the CBC is not adopted and in lieu, LAMC Subsection 91.1402.3 is added.

91.1402.3. Structural. Exterior walls, and the associated openings, shall be designed and constructed to resist safely the superimposed loads required by Division 16, Article 1, Chapter IX of the LAMC.

   In no case shall veneer be considered as part of the wall in computing strength or deflection, nor shall it be considered a part of the required thickness of the wall. Deflection of lateral support of veneer, including wood studs, shall be no greater than h/500.

DIVISION 15 ROOFS AND ROOF STRUCTURES

(Division Amended by Ord. No. 179,324, Eff. 12/10/07, Oper. 1/1/08.)

Section

91.1500   Basic Provisions.

91.1505   Fire Classification.

91.1507   Requirements for Roof Coverings.

91.1511   Reroofing.

SEC. 91.1500. BASIC PROVISIONS.

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

SEC. 91.1505. FIRE CLASSIFICATION.

   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. 185,587, Eff. 7/16/18.) Roof assemblies shall be divided into the classes defined below. Class A, B and C roof assemblies and roof coverings required to be listed by this section shall be tested in accordance with ASTM E 108 or UL 790. The minimum roof coverings installed on buildings shall comply with CBC Table 1505.1 based on the type of construction of the building.

   EXCEPTION: Skylights and sloped glazing shall comply with Division 12, Article 1, Chapter IX of the LAMC.

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

SEC. 91.1507. REQUIREMENTS FOR ROOF COVERINGS.

   (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. 181,758, Eff. 8/8/11.)

GENERAL – CLAY OR CONCRETE ROOF TILE
Maximum basic wind speed (mph)	Mean roof height (feet)	Roof slope up to <3:12	Roof slope 3:12 and over
85	0-60	Two fasteners per tile.	Two fasteners per tile.
100	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. All 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 CBC Section 1609.5.3.
120	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
130	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
All	>60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.

 

INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS d, e (Installations on solid sheathing with battens)
Maximum basic wind speed (mph)	Mean roof height (feet)	Roof slope up to < 5:12	Roof slope 5:12 < 12:12	Roof slope 12:12 and over
85	0-60	Minimum slope is 4:12. One fastener per tile.	One fastener per tile. Tiles with installed weight less than 9 lbs./sq. ft. require a minimum of one fastener per tile.	One fastener required for every tile. Tiles with installed weight less than 9 lbs./sq. ft. require a minimum of one fastener per tile.
100	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. All 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 CBC Section 1609.5.3.
120	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
130	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
All	>60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.

 

INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS (Installations on solid sheathing without battens)
Maximum basic wind speed (mph)	Mean roof height (feet)	Minimum roof slopes 4 units vertical in 12 units horizontal Maximum slope 7 units vertical in 12 units horizontal
85	0-60	One fastener per tile.
100	0-40	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. All 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 CBC Section 1609.5.3.
120	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
130	0-60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.
All	>60	The fastening system shall resist the wind forces in CBC Section 1609.5.3.

 

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.