SEC. 91.1511. REROOFING.

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

   Section 1511 of the CBC is adopted by reference, except CBC Sections 1512.2.1 and 1512.3 are not adopted and, in lieu, Los Angeles Municipal Code Subsections 91.1512.2.1 and 91.1512.3 are added.

91.1512.2.1. 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.

91.1512.3. Roof Recovering. Roof covering may be applied over existing roofing in accordance to Los Angeles Municipal Code Table 1512.1.

TABLE 1512.1
ALLOWABLE REROOFS OVER EXISTING ROOFING

EXISTING ROOFING	NEW OVERLAY ROOFING
	BUILT UP	ASPHALT SHINGLE	TILE ROOF	METAL ROOF	MODIFIED BITUMEN	SPRAY POLY- URETHANE FORM
Built Up	Yes	Yes (2:12)	Yes (2.5:12)	Yes	Yes	Yes
Asphalt Shingle	NP	Yes	Yes (2.5:12)	Yes	Yes	NP
Asphalt over Asphalt	NP	Yes	Yes	Yes	Yes	NP
Tile Roof	NP	NP	NP	NP	NP	NP
Metal Roof	NP	NP	NP	Yes	NP	NP
Modified Bitumen	Yes	Yes	Yes (2.5:12)	Yes	Yes	NP

 

NP = Not Permitted.

Note: (Minimum Roof Slope)