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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 Table 1508.2.

[BF] TABLE 1508.2
MATERIAL STANDARDS FOR ROOF INSULATION
Cellular glass board ASTM C552
Composite boards ASTM C1289, Type III, IV, V or VII
Expanded polystyrene ASTM C578
Extruded polystyrene ASTM C578
Fiber-reinforced gypsum board ASTM C1278
Glass-faced gypsum board ASTM C1177
High-density polyisocyanurate board ASTM C1289, Type II, Class 4
Mineral fiber insulation board ASTM C726
Perlite board ASTM C728
Polyisocyanurate board ASTM C1289, Type I or II
Wood fiberboard ASTM C208, Type II

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