Products / Half-Inch Retro-Fit Board

The 1/2 inch Retro-Fit Board is an expanded perlite-based roof cover board with cellulosic fiber reinforcement and a TopLoc coated top surface, used as a divorcing layer in re-roofing and as the top layer in multi-layer insulation systems under hot-asphalt roofing. The data sheet (RS-5047, 3-24) says it meets ASTM C728 Type 2 and prints a 1/2 inch thickness in 2 by 4, 4 by 4 and 4 by 8 foot sizes, made in Rockdale, Illinois.