Building Waterproof Backing

Contractors undertaking overseas home renovations, commercial projects, and swimming pool/basement projects have almost universally encountered the problems caused by damp walls. Ordinary gypsum board swells and molds when exposed to water, and ordinary cement substrates are too heavy, requiring multiple layers of waterproofing during construction. This cumulative process increases labor and material costs, and subsequent repairs due to tile hollowing and wall dampness incur additional expenses. Building waterproofing backing boards, as integrated moisture-proof base panels, effectively solve these pain points in damp construction, and demand for them in overseas wetland renovation projects is steadily increasing.

Support and Shaping: Filling irregular areas such as corners and pipe roots, providing a flat and solid support surface for the waterproofing layer and preventing collapse.

Stress Dispersion: Possessing a certain degree of rigidity or toughness, it effectively disperses external forces, reducing the risk of punctures during subsequent construction or use.

Penetration Prevention: As a buffer layer, it prevents moisture and acid/alkali media from penetrating from the base layer to the waterproof layer, improving the sealing of joints.

Residential Decoration: Widely used in high-humidity areas such as bathrooms, kitchens, and balconies, replacing traditional leveling and waterproof coating processes, preventing leaks and tile hollowing.

Commercial and Public Buildings:Suitable for public restrooms in shopping malls, hotels, hospitals, and swimming pool changing rooms; water-resistant, moisture-proof, antibacterial, and easy to clean.

Building Enclosures: Used in underground garages and tunnels to prevent groundwater penetration, or as a waterproof base layer for external wall insulation systems.

The board is a three-layer integrated high-pressure composite molding process with a simple and practical design, free of unnecessary complex processes. The core layer is a high-density closed-cell XPS extruded polystyrene board, which absorbs almost no water and will not expand or deform even after long-term immersion in water. Alkali-resistant fiberglass mesh is bonded to both sides of the board, and an outer layer of polymer waterproof mortar is applied. The mesh firmly adheres to the mortar layer, mitigating cracking and peeling caused by thermal expansion and contraction. The composite adhesion is strong and will not delaminate over long-term use. The standard size on the market is 1220×2440mm, with thicknesses ranging from 6–50mm, customizable to meet specific needs. For home kitchen and bathroom walls, thinner 10mm or 12mm panels are commonly used. For high-humidity areas such as swimming pool floors and basement walls, thicker panels (15mm or more) are generally chosen to balance load-bearing capacity and waterproofing.

Waterproofing and moisture resistance are the core advantages of this panel, and the key difference between it and ordinary wall lining panels. The completely closed panel structure forms a continuous waterproof layer, making it difficult for moisture to penetrate and corrode the internal framework and the original wall. In long-term high-humidity environments, it is less prone to mold growth, whitening, and efflorescence. Whether in home shower rooms and kitchen sink areas, or hotel swimming pools, saunas, hospital restrooms, and coastal basements with high salt spray, it provides stable waterproofing, eliminating the need for separate waterproof membrane installation and effectively shortening the overall construction period.