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3/4 in. x 1.25 ft. x 4 ft. R-2.65 Polystyrene Panel Insulation Sheathing (6-Pack) 150705 - The Home Depot
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STYROFOAM R-4, 0.78-in x 4-ft x 8-ft Residential Sheathing Faced Polystyrene Board Insulation in the Board Insulation department at Lowes.com
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1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) - Walmart.com
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6 Pack White Foam Sheets 1 Inch Thick, Polystyrene Rectangle Blocks for DIY Crafts, Art Supplies, Packing (12x4 Inches) - Walmart.com
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