Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES

Section 1508 — ROOF INSULATION

2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California

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[BF] 1508.1 General. The use of above-deck thermal insulation shall be permitted provided that such insulation is covered with an approved roof covering and passes the tests of NFPA 276 or UL 1256 when tested as an assembly. Exceptions: 1. Foam plastic roof insulation shall conform to the material and installation requirements of Chapter 26. 2. Where a concrete or composite metal and concrete roof deck is used and the above-deck thermal insulation is covered with an approved roof covering. [BF] 1508.2 Material standards. Above-deck thermal insulation board shall comply with the standards in…