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SEC. 91.1511.  REROOFING.
   (Added by Ord. No. 184,692, Eff. 12/30/16.)
 
   Section 1511 of the CBC is adopted by reference, except CBC Sections 1511.3.1 and 1511.4 are not adopted and, in lieu, LAMC Subdivision 91.1511.3.1 and Subsection 91.1511.4 are added.
 
91.1511.3.1.  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.
 
91.1511.4.  Roof Recovering.  Roof covering may be applied over existing roofing in accordance to LAMC Table 1511.1.
 
TABLE 1511.1
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)