N.Y.C. Admin. Code § BC 1508: 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