PROVA Board Plus+ Waterproof Tile Backer Board
PROVA Board Plus+ is a 100% waterproof tile backer board engineered to replace heavy, moisture-prone cement boards with a lighter, faster, and more reliable solution for showers, bathrooms, wet rooms, and anywhere tile meets water. Built on a high-density closed-cell XPS foam core with cementitious coating and reinforcing fiberglass mesh on both sides, PROVA Board delivers genuine 100% waterproofing — not surface resistance — right out of the box, with no additional waterproofing membrane required.
What separates PROVA Board Plus+ from cement board is the closed-cell composition: water cannot penetrate the core even if the surface is cut or punctured, and the board will never warp, swell, rot, or support mold or mildew growth over time. It's also up to 70% lighter than cement board, cuts cleanly with a standard utility knife (no saws, no silica dust, no mess), and installs quickly using PROVA Seal Hybrid Sealant and PROVA Fasteners — a faster, cleaner installation on every single job.
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100% waterproof with vapor resistance — inherently waterproof XPS core blocks moisture, leaks, and vapor in the most demanding wet areas including steam rooms and saunas
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Closed-cell integrity under the knife — maintains full waterproof performance even when cut or punctured; no open cells to absorb or wick moisture through exposed edges
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IAPMO R&T & IC-ES Certified (Listing No. PMG-1794) — tested and compliant with Uniform Plumbing Code (UPC®) and National Plumbing Code of Canada
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ASTM C627 Robinson Floor Test — Light Commercial Rating — certified for residential and light commercial tile installations including tile, marble, and natural stone
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½" (12.7 mm) rigid construction — high compressive strength supports large-format tile and heavy stone without deflection or sag
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Two board sizes — 32" × 48" (10.67 sq ft/board) and 48" × 96" PROVA Board 4×8 format (32 sq ft/board) for larger areas with fewer seams
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Versatile applications — suitable for walls, floors, and ceilings on wood or metal joists and studs; ideal for showers, tub surrounds, saunas, wet rooms, countertops, and backsplashes
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Complete system integration — the PROVA Board Plus+ waterproofing tile backer works seamlessly with PROVA Seal and PROVA Fasteners and Washers to form a fully warrantied waterproof system
PROVA Board Plus+ carries PROVA's Lifetime Warranty when installed as part of the complete PROVA Board waterproofing system — sealing all joints, seams, and pipe penetrations with PROVA Seal activates full lifetime coverage.
Free shipping to the contiguous US on all orders. Contractors can apply for additional savings through the ProLux Materials Pro Contractor Program.
Frequently Asked Questions
Is PROVA Board Plus+ truly 100% waterproof, even after cutting?
Yes. PROVA Board Plus+ uses a closed-cell XPS foam core that is inherently waterproof — water cannot penetrate the material even when the board is cut or the surface is punctured. This is the key difference from cement board or gypsum-based products, which are only moisture-resistant and can wick water through cut edges. The closed-cell structure blocks moisture at a material level, not just at the surface.
Do I still need a separate waterproofing membrane with PROVA Board Plus+?
No. When installed correctly with PROVA Seal Hybrid Sealant and PROVA Fasteners, PROVA Board Plus+ functions as the complete waterproofing layer — no additional membrane is required. The key step is sealing all joints, seams, corners, and pipe penetrations with PROVA Seal. This completes the waterproof assembly and activates the Lifetime Warranty.
Can PROVA Board Plus+ be used on floors, walls, and ceilings?
Yes. PROVA Board Plus+ is suitable for walls, floors, and ceilings on wood or metal joists and studs. It is used in showers, tub surrounds, steam rooms, saunas, wet rooms, countertops, and backsplashes — anywhere you need a rigid, 100% waterproof substrate for tile installation.
