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1-in x 4-ft x 8-ft Expanded Polystyrene Board Insulation in the Board Insulation department at Lowes.com
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Foamular 250 3 in. x 4 ft. x 8 ft. R-15 Scored Squared Edge Rigid Foam Board Insulation Sheathing 9GB - The Home Depot
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Owens Corning PBL28 2-Inch X 4-Foot X 8-Foot Squared Edge Foamular 150 Insulation Sheathing at Sutherlands
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