1.1 This specification covers either untextured or surface textured non-asbestos fiber cement flat sheets intended for exterior applications such as claddings, facades, curtain walls, soffits, etc.

1.2 This specification is not applicable to asbestos-cement flat sheets (Specification C 220), gypsum-based boards (Specifications C 442, C 630, C 1177, C 1178), or particle boards (Definitions D 1554) discrete non-asbestos fiber-cement interior substrate sheets (Specification C 1288), fiber-mat reinforced non-asbestos cement interior substrate sheets (Specification C 1325), or cement-bonded particleboards (Specification BS 5669: Part 4) and (ISO 8335).

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.