High Compression XPS Waterproof Backer Board Thermal Insulation for Underfloor Heating System

A waterproof backing board is a high-performance sandwich composite panel specially designed for wet-area tiling projects. It adopts a closed-cell XPS foam core with double-sided fiberglass-reinforced cement polymer mortar surface, integrating waterproof, mold-proof, heat insulation and high-strength properties. It serves as a stable wall and floor substrate for bathroom, kitchen and other humid space decoration, replacing traditional easy-to-swell gypsum boards and wood panels.

Yes. It is a standard three-layer sandwich composite board. The high-density XPS foam core provides lightweight and thermal insulation performance, while the double cement mortar surface layer offers high hardness, adhesion and waterproof capacity. The integral composite structure avoids delamination and ensures overall structural stability.

The board features near-zero capillary water absorption, with a 24hour water immersion water absorption rate 0.2%. The closed-cell XPS core completely blocks moisture penetration. It will not absorb water, swell, warp or delaminate in long-term humid or water-soaked environments, solving the core problem of traditional decorative substrates in wet areas.

Absolutely applicable. It is specially customized for continuous wet environments. It maintains stable physical properties in high humidity and splashing water conditions, and will not breed mold or rot, which is the ideal substrate for shower rooms, swimming pool edges and sauna rooms.

No mold growth. The inorganic composite formula has natural antibacterial and anti-mold properties, complying with ASTM G21 zero-level mold resistance standard. It can effectively inhibit the reproduction of bacteria and mold in high-humidity closed spaces, keeping the wall base clean and hygienic.