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Backer Board Shower Surround Walls - GoBoard Install Kit (6 Sheets Covers 90SF, 4 Tubes Poly, 2.5lb. Screws) : Amazon.ca: Tools & Home Improvement
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Johns Manville GoBoard 3-ft x 5-ft x 1/2-in Waterproof Polyisocyanurate Backer Board in the Backer Board department at Lowes.com
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bathroom - Cement Board versus Mold Resistant Drywall at Top of Bath Tub/ Shower Surround - Home Improvement Stack Exchange
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