What Treatments Should Be Strengthened for GRC Decorative Panels in Humid Environments?

In humid environments (humidity ≥80%, such as basements, bathrooms, and coastal areas), GRC decorative panels require reinforced triple treatment of "moisture-proofing and mildew resistance, corrosion and rust prevention, and sealed waterproofing". Through material modification, surface protection, and optimized installation construction, Qinglong extends the service life of GRC panels in humid environments to over 20 years. Humid-environment projects such as Guiyang Huaguoyuan and the Xinjiang River ecological restoration in Yiyang County have shown no mildew or corrosion problems.

1. Material Modification: Enhancing Intrinsic Moisture-Proof and Mildew-Resistant Capability

Material modification is the foundation of moisture-proofing. Cement matrix optimization: low-alkali cement (alkali content ≤0.6%) + silica fume admixture (15-20%) is selected to reduce water absorption (≤3%); Qinglong's modified GRC panels have a water absorption rate ≤2.5%, making moisture penetration difficult. Fiber protection: alkali-resistant glass fibers are coated with an anti-alkali coating to prevent fiber corrosion in humid environments; Qinglong's fiber anti-alkali coating is ≥0.1mm thick, with alkali resistance retention ≥90%. Moisture-proofing agent addition: inorganic moisture-proofing agents (such as nano silica, at a dosage of 3-5%) are added to improve density; Qinglong's moisture-proofing agent brings panel density to ≥2.2g/cm³, improving moisture-proof performance by 30%.

2. Surface and Joint Protection: Blocking Moisture Pathways

Surface and joint treatment prevents moisture intrusion. Surface protection: silane impregnation agent or fluorocarbon waterproof coating (thickness ≥30μm) is applied to form a moisture barrier; Qinglong's silane impregnation agent penetrates to a depth ≥3mm, reducing surface water absorption by 60%. Joint sealing: at joints such as splicing seams and screw holes, waterproof sealant is injected with foam backer rod filling; Qinglong's sealant is of the mildew-resistant type, with anti-mold rating ≥Level 1 (no mold growth). Back-side moisture-proofing: the back of panels is coated with moisture-proof coating (such as cement-based penetrating crystalline coating); Qinglong's moisture-proof coating is applied at a thickness ≥1.5mm, with no moisture resurgence on the back.

3. Installation Construction and Qinglong Project Practice

Optimized installation construction adapts to humid environments. Installation spacing: a 50-100mm ventilation gap is reserved between panels and the substrate to prevent substrate moisture erosion; for Qinglong's basement GRC panels at Guiyang Huaguoyuan, an 80mm ventilation gap was reserved, with no mildew. Drainage design: drainage holes (spacing ≤2m) are provided on walls to discharge condensate promptly; for Qinglong's GRC panels at the landscape pavilion of the Xinjiang River ecological restoration project in Yiyang County, drainage holes are spaced at 1.5m for smooth drainage. Anti-corrosion treatment: metal hangers and bolts are coated with anti-corrosion coating (galvanizing + fluorocarbon paint) to prevent rusting in humid environments; Qinglong's metal fittings have an anti-corrosion coating thickness ≥80μm and a rust-proof service life ≥15 years. Project case: the basement GRC decorative panels at Guiyang Huaguoyuan (humidity 85%), through material modification + surface protection + ventilation construction design, have been in use for 8 years with no mildew or corrosion.