Section R902.1 is amended to read:
R902.1 Roofing covering materials. Roofs shall be covered with materials as set forth in Sections R904 and R905. A minimum Class A or B roofing shall be installed in areas designated by this section or where the edge of the roof deck is less than 3 feet (914 mm) from a lot line. Class A or B roof assemblies are required by this section, they shall be tested in accordance with ASTM E108 or UL 790. Where required, the roof assembly shall be listed and identified as to class by an approved testing agency.
Exceptions:
1. | Class A roof assemblies include those with coverings of brick, masonry, and exposed concrete roof deck. |
2. | Class A roof assemblies also include ferrous or copper shingles or sheets, metal sheets and shingles, clay or concrete roof tile, or slate installed on noncombustible roof decks or ferrous, copper or metal sheets installed without a roof deck on noncombustible framing. |
3. | Class A roof assemblies include minimum 16 ounces per square foot (4.882 kg/m2) copper sheets installed over combustible roof decks. |
4. | Class A roof assemblies include slate installed over underlayment over ASTM D226, Type II underlayment over combustible decks. |
Wood roof coverings are prohibited with the following exception:
Re-roofing of less than 10% or the total roof area of existing wood roof covering in four years may be done with fire-retardant shakes or shingles.
Section R908.3 of the California Residential Code is amended by deletion of Exception 3.
(Ord. 1200, 11/12/2025)