BC 1508 — Roof Insulation
New York City Administrative Code (current through L.L. 2026/147, enacted September 12, 2026, and amendments effective through October 10, 2026) · NYC Building Code § BC 1508
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Section BC 1508: Roof Insulation
1508.1 General. The use of above-deck thermal insulation shall be permitted provided 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 of this code. 2. Where a concrete roof deck is used and the above-deck thermal insulation is covered with an approved roof covering. 1508.1.1 Cellulosic fiberboard. Cellulosic fiberboard roof insulation shall conform to the material and installation requirements of Chapter 23. 1508.2 Material standards. Above-deck thermal insulation board shall comply with the standards in Table 1508.2. Table 1508.2 Material Standards for Roof Insulation Material Standard Cellular glass board ASTM C 552 Composite boards ASTM C 1289, Type III, IV, V or VI Expanded polystyrene ASTM C 578 Extruded polystyrene ASTM C 578 Fiber-reinforced gypsum board ASTM C 1278 Glass-faced gypsum board ASTM C 1177 Mineral fiber insulation board ASTM C 726 Perlite board ASTM C 728 Polyisocyanurate board ASTM C 1289, Type I or II Wood fiberboard ASTM C 208