What Treatments Do GRC Decorative Panels Need in Humid Environments? Moisture Proofing, Corrosion Resistance, and Qinglong Group's Durability Enhancement System

Humid environments (such as bathrooms, swimming pools, coastal areas, and underground spaces) pose severe challenges to the durability of GRC decorative panels, requiring a systematic reinforcement approach integrating "matrix enhancement, interface protection, and systematic drainage" as a trinity. In high-temperature, high-humidity projects such as Chimelong Ocean Kingdom in Zhuhai and the Atlantis Hotel in Sanya, Qinglong Group achieved material optimization through the use of low-alkali sulfoaluminate cement, high-zirconia alkali-resistant glass fiber (ZrO₂≥16%), and silane-based waterproofing admixtures, combined with structural treatments such as six-sided waterproof coatings, multiple seam sealing, and back cavity drainage channels. As a result, the annual growth of carbonation depth of GRC panels is kept within 0.08mm in environments with long-term humidity above 80%, with a guaranteed service life of more than 30 years. The key to moisture-proofing lies in blocking water penetration paths and enhancing the material's own resistance to erosion.

Material System Optimization Is Fundamental

For humid environments, low-alkali sulfoaluminate cement with excellent impermeability is the preferred choice. Qinglong Group adds silica fume (≥20%) and high-range water-reducing admixtures to the mix, strictly controlling the water-binder ratio below 0.30, achieving a highly dense matrix with water absorption below 6%. The glass fiber must be an alkali-resistant type with high zirconia content (≥16%), upgraded from unidirectional mesh to bidirectional or composite fiber mesh to withstand multi-directional stresses.

Surface and Interface Protection Is the Key Barrier

Matrix densification alone is not enough; an active protective layer must be established. We apply "six-sided protection" to GRC panels used in humid environments: all surfaces (including cut edges) are coated with penetrating water repellents (such as silane impregnating agents) to a penetration depth of no less than 3mm, forming a hydrophobic layer. On the back side (facing the interior), a breathable waterproof membrane is added to prevent condensation erosion.

Structural Drainage Design Is the Systematic Guarantee

Eliminating water accumulation is the core of moisture-proofing. During installation, ensure the back cavity of the panels remains unobstructed, with drainage holes provided at the bottom. Seams are sealed with mildew-resistant silicone sealant, with properly designed drainage slopes. Qinglong Group prepares a customized "Moisture-Proofing Design Special Report" for each humid-environment project, controlling risks at the source. Systematic moisture-proofing treatment keeps GRC enduring and ever-renewing in harsh environments.