Owens Corning FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing 21UM - The Home Depot
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Washers for Installation of Foam Board Panels 1-1/4 Inch Galvanized Steel Washer for Fixing Fastening Installation (300 Packs) : Amazon.co.uk: Business, Industry & Science
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Amazon.com: Expanded PVC Foam Board, White, 1/4" (0.25", 6MM) Thick, 36" W x 48" L : Industrial & Scientific