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Owens Corning FOAMULAR 1/2 in. x 4 ft. x 8 ft. R-3 Square Edge Rigid Foam Board Insulation Sheathing 36L - The Home Depot
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GreenGuard R-5, 1-in x 2-ft x 2-ft Unfaced Foam Board Insulation in the Board Insulation department at Lowes.com
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Kingspan Insulation R-10, 2-in x 4-ft x 8-ft Unfaced Foam Board Insulation in the Board Insulation department at Lowes.com
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