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Everbilt 32 in. x 4 ft. x 1/2 in. XPS Foam Waterproof Backer Board Underlayment for Wall Tile and Stone (30 per pallet) EVB3248125BP - The Home Depot
![wedi Tub and Shower Wall Kit 3-ft x 5-ft x 1/2-in Waterproof Polystyrene Foam Backer Board in the Backer Board department at Lowes.com wedi Tub and Shower Wall Kit 3-ft x 5-ft x 1/2-in Waterproof Polystyrene Foam Backer Board in the Backer Board department at Lowes.com](https://mobileimages.lowes.com/productimages/d8631be6-fbda-47ee-9c99-da442b31af28/44113685.jpg)
wedi Tub and Shower Wall Kit 3-ft x 5-ft x 1/2-in Waterproof Polystyrene Foam Backer Board in the Backer Board department at Lowes.com
![Schluter Systems Waterproof Extruded Polystyrene Foam Kerdi Board w/ Thermal Insulation KB121220812 (11x Building Panel 48" x 32" x ½") for Shower Wall & Tile Substrate Coverage 117.3 Sq Ft (10.9 SqM) - Schluter Systems Waterproof Extruded Polystyrene Foam Kerdi Board w/ Thermal Insulation KB121220812 (11x Building Panel 48" x 32" x ½") for Shower Wall & Tile Substrate Coverage 117.3 Sq Ft (10.9 SqM) -](https://m.media-amazon.com/images/I/61wTJf3Ak4L._AC_UF894,1000_QL80_.jpg)