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Schluter Systems Kerdi-Board 48-in x 32-in x 1/2-in Water Resistant Polystyrene Foam Backer Board in the Backer Board department at Lowes.com
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DURAL Durabase XPS 32 in. x 48 in. x 1/2 in. Foam Backer Board Underlayment (Package of 9 - 96 sq. ft.) TILUXBD-3248125 - The Home Depot
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bathtub - What are the pros and cons of adding a vapor barrier behind shower backer board? - Home Improvement Stack Exchange
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