Waterproof XPS Bathroom Backer Board

Extruded Polystyrene Core with Polymer-Modified Cement Coating
Our Waterproof XPS Tile Backer Board is a rigid, lightweight panel engineered for wet-area wall and floor installations. It features a high-density extruded polystyrene (XPS) core reinforced on both sides with an alkali-resistant fiberglass mesh embedded in a polymer-modified cementitious coating.

Unlike traditional cement boards that absorb moisture and add dead load to structures, this composite panel combines waterproofing, thermal insulation, and high compressive strength in a single layer. It serves as a stable, ready-to-tile substrate for ceramic, porcelain, and natural stone tiles in residential, commercial, and hospitality projects.

Zero Moisture Absorption
The closed-cell structure of the XPS core prevents water from wicking through the panel. Unlike gypsum-based boards that soften and degrade upon prolonged exposure to moisture, the core remains dimensionally stable behind tiled surfaces in environments such as:

• Shower enclosures and wet rooms
• Steam rooms and spa facilities
• Commercial kitchens and laundry rooms

High Bond Strength
Both faces feature a textured mineral coating that provides high mechanical keying with polymer-modified cement tile adhesives (thin-set mortars). This surface texture eliminates the need for priming or additional waterproofing membranes over the board itself, reducing tile debonding risks.

Reduced Weight and Labor
Weighing substantially less than standard fiber-cement boards (density: 30--40 kg/m^3), these panels reduce handling fatigue on the job site. Large-format sheets can be managed by a single installer, speeding up framing, positioning, and fastening phases.

Compressive Resistance
Despite its lightweight nature, the dense XPS core provides a compressive resistance of >= 300 kPa. It supports standard tile loads across walls, partition walls, bathtub surrounds, and shower benches without crushing or deflection when installed over standard framing spacings.

Thermal Insulation
The integrated XPS foam core exhibits a thermal conductivity of approximately 0.03--0.035 W/m·K. It reduces thermal bridging through exterior walls and functions effectively as an underlayment thermal break beneath electric or hydronic underfloor heating systems.

Fast Fabrication
Panels can be scored and snapped using a utility knife or cut with a standard circular saw. Installers can rapidly fabricate pipe penetrations, niches, curbs, and curved architectural details without specialized wet-saw equipment.

Dimensional Stability
The core is unaffected by temperature fluctuations and relative humidity shifts. It resists warping, shrinking, and delamination, preventing stress fractures from transferring to the finished tile grout lines.

Our production line operates under strict process controls to ensure batch-to-batch consistency:

Lamination & Curing: Controlled adhesive application and mechanical pressure rollers guarantee uniform bond integrity between the XPS core and cement coatings, preventing delamination.

Dimensional Tolerance: Automated cutting systems maintain strict diagonal squareness and thickness tolerances to ensure flush joints during installation.

Batch Testing: Random samples from every production run are tested in-house for compressive strength, coating adhesion, and water absorption rates.

We provide full support for private-label distributors, importers, and large contractors:

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