Available in ½", ¾" and 1" thicknesses, our extruded polystyrene (XPS) insulation board offers our highest thermal performance in siding underlayment with R-Values of 3.0 (1/2") to 5.0 (1"). GreenGuard® CM Insulation Board is available as 2’ x 8’ and 4’ x 8’ (shown) sheets.

GreenGuard® Fanfold Siding Underlayment is a 4’ x 50’ continuous air and moisture barrier, fanfolded into a 2’ x 4’ bundle for convenient handling.

Available in ½", ¾" and 1" thicknesses, our Extruded Polystyrene (XPS) GreenGuard® SL Insulation Board offers our highest thermal performance in siding underlayment with R-Values of 3.0 (1/2") to 5.0 (1"). The unique, interlocking shiplap edges virtually eliminate energy robbing seams and gaps.

GreenGuard® SL Insulation Board is available as 2’ x 8’ (shown) and 4’ x 8’ shiplap edge sheets.