HH-I-526C (NOTICE-1), FEDERAL SPECIFICATION: INSULATION BOARD, THERMAL (MINERAL FIBER) (19-MAY-1983 ) [S/S BY ASTM-C726]

HH-I-526C (NOTICE-1), FEDERAL SPECIFICATION: INSULATION BOARD, THERMAL (MINERAL FIBER) (19-MAY-1983 ) [S/S BY ASTM-C726]., Federal Specification HH-1-526C,dated October 17,1968,is hereby canceled.American Society for Testing and Materials(ASTM)Standard C 726 adequately covers the requirements for this material. This specification covers the composition and physical properties of mineral wool insulation board used above structural roof decks in building construction. The mineral wool roof insulation acts as a base for systems such as single-ply, polymer-modified bitumen and built-up roof. This specification also covers mineral wool insulation boards that incorporate a fibrous high density upper layer on the top surface.