Profilitec Showertec STBO122X81 Waterproof Polypropylene Foam Backer Board 48" x 32" x 1/2"– Lightweight Tile Underlayment Panel with Fleece Webbing on Both Sides

Product Features:

• High-performance polypropylene construction panel with non-woven fleece webbing on both sides for superior mortar adhesion
• Fully waterproof, vapor-tight, mold-resistant, and thermally insulating—ideal for wet zones and high-humidity environments
• Unique internal cell structure enhances compressive strength and enables easy scoring for benches, niches, and custom shapes
• Lightweight and easy to handle with printed 10 mm gridlines for fast, precise cutting using a utility knife or jigsaw
• Available in convenient 48" x 32" (122 x 81 cm) size with 1/2" (12.6 mm) thickness, perfect for shower installations
• Compatible with wood studs, metal framing, concrete, masonry, and brick; installs using standard self-tapping drywall screws
• Supports vertical and horizontal mounting; no washers required during installation
• Designed for use with all tile types including porcelain, ceramic, marble, granite, onyx, slate, mosaic, glass, and resin-backed tile
• Meets ANSI A118.10 and TCNA guidelines; rated for flame and smoke resistance (ASTM E84 and NFPA 286 compliant)
• Ideal for showers, steam rooms, walk-in showers, curbless shower floors, ADA installations, spa rooms, and wet room applications
• Eco-friendly and fully recyclable; contains no fiberglass, adhesives, or harmful chemicals—perfect for green building initiatives
• A trusted alternative to traditional cement backer boards and drywall, offering unmatched structural reliability and long-term waterproofing integrity

Product Description:

The Profilitec Showertec STBO waterproof polypropylene foam board is a premium professional-grade tile backer and substrate panel designed for highly versatile waterproofing wet areas in both residential and commercial settings. 

Constructed with a multilayer, heat-bonded extruded polypropylene foam core and laminated non‑woven fleece webbing on both sides, it offers a fully waterproof board, vapor-tight, mold-resistant, and thermally insulating solution ideal for use in showers, bathrooms, steam rooms, spa rooms, saunas, and poolside wet zones. 

This waterproof construction panel features a unique internal cell-structured design that enhances high compressive strength, allows for easy scoring to create custom shapes like construction board for benches and niches, and ensures zero residue is left when cut. The printed 10 mm grid pattern ensures precise cutting and layout alignment using a standard utility knife or jigsaw. Lightweight and dimensionally stable, it eliminates the need for heavy cement board, reducing labor time and simplifying handling on the jobsite. 

The STBO board rigid polypropylene core contributes to its exceptional dimensional stability and load-bearing capacity, making it suitable for use in demanding environments. It comes in a convenient size of 48" x 32" (122 x 81 cm) with consistent 1/2" (12.6 mm) thickness and is compatible with installation over wood studs, metal framing, concrete, brick, and masonry. It installs quickly using 1¼" self-tapping drywall screws without washers and supports both vertical and horizontal mounting. The dual fleece layers ensure a strong bond with modified thin-set mortar adhesive, guaranteeing optimal adhesion and a secure and long-lasting tile bond, making this board ideal for a wide range of tile and stone finishes, including ceramic, porcelain, granite, marble, mosaic, travertine, slate, resin-backed tile, large-format tile, glass, and soft natural stones like onyx. 

It complies with ANSI and TCNA standards for vapor-resistant substrate and bonded waterproof membrane systems and passes ASTM E84 and NFPA 286 for flame and smoke resistance, with a low water vapor permeance of 0.0009 perms and thermal R-value around 0.984. This makes it suitable for high-moisture and high-temperature environments, including steam showers, commercial washrooms, tub surrounds, walk-in showers, curbless shower floors, ADA barrier-free installations, gyms, hotels, fitness centers, luxury homes, and wet room applications.

It's also environmentally friendly and fully recyclable, free of fiberglass, paper, adhesives, and harmful chemicals, making it an excellent choice for green building projects and sustainable construction. The STBO board is fully compatible with the complete Profilitec Showertec system, including FOILTEC waterproofing strips, FIXXTEC sealant, preformed inside and outside corners, linear drains, shower trays, and curbs. 

Whether you're working on a new build, a bathroom renovation, or a DIY project, the Profilitec STBO waterproof foam backer board offers professionals seeking dependable waterproofing solutions a preferred choice that simplifies waterproofing installation and enhances overall project efficiency. Trusted by tile contractors across North America, this board is an essential component in tile installation for shower wall panel use, tile underlayment, and underlayment systems, delivering a reliable and modern solution that ensures long-term durability and superior performance. It is a high-performance alternative to traditional cement backer boards and traditional tile backer boards, offering exceptional structural reliability. Architects and builders choose this product for its fast installation, easy to handle compact size, and long-term waterproofing integrity across every project.

Our indoor waterproofing systems, despite being eco-friendly products, are a highly efficient way to protect your shower from water leaks, floor and wall damage, moisture damage such as mold, and even flooding.