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Insulation and Cover Boards

Half inch Retro-Fit Board

1/2" (13 mm) Retro-Fit™ Board is a high density board made of expanded perlite and cellulosic fibers. The top surface is sealed with TopLoc® coating to ensure good attachment in bituminous applications. 1/2" (13 mm) Retro-Fit Board meets the physical requirements of ASTM C 728.

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