The use of above-deck thermal insulation shall be permitted provided such insulation is covered with an approved roof covering and complies with FM 4450 or UL 1256.
Above-deck thermal insulation board shall comply with the standards in Table R906.2.
MATERIAL STANDARDS FOR ROOF INSULATION
|Cellular glass board||ASTM C552|
|Composite boards||ASTM C1289, Type III, IV, V or VI|
|Expanded polystyrene||ASTM C578|
|Extruded polystyrene board||ASTM C578|
|Perlite board||ASTM C728|
|Polyisocyanurate board||ASTM C1289, Type I or II|
|Wood fiberboard||ASTM C208|
|Fiber-reinforced gypsum board||ASTM C1278|
|Glass-faced gypsum board||ASTM C1177|