Key Points for Connecting GRC Exterior Walls with Door and Window Openings? GRC Door and Window Opening Waterproofing Technical Specifications

The connection between GRC exterior walls and door/window openings requires focused handling of three aspects: waterproofing, sealing, and deformation coordination. A concrete frame is set around the opening (width ≥100mm), with a 15-20mm gap between the GRC panel and the opening, filled with polyurethane foam adhesive + silicone sealant. Window frame installation tolerance ≤3mm, sealant bond strength ≥0.5MPa, ensuring water tightness and air tightness meet standards.

Specific practices: install a drip edge along the top of the opening (overhang ≥20mm), waterproof boards on the sides (slope ≥10%), and drainage holes at the bottom (spacing ≤500mm). One project adopted a multi-layer waterproofing design and showed no leakage in water spray testing. The Qinglong GRC opening treatment method has been successfully applied to multiple key projects.

Waterproof Structural Design

Designed using the rain screen principle, with cavity depth ≥20mm. Multiple waterproof lines are provided so that failure of any single line does not affect the whole. Drainage hole area ≥1/50 of the water infiltration area, to promptly drain infiltrated water.

Sealing System Requirements

Foam adhesive fill fullness ≥90%, sealant thickness ≥6mm. Two-component sealant is used, with a curing time of 4-8 hours. Sealant movement capability ≥25%, accommodating thermal deformation.

Installation Precision Control

Window frame positioning tolerance ≤2mm, verticality ≤1.5mm/m. GRC panel installation tolerance ≤3mm, with uniform joints. Three-dimensionally adjustable connectors are used to eliminate accumulated errors.

Acceptance Testing Methods

Water spray test pressure 0.3MPa, duration 30min. Air tightness test pressure difference 100Pa, air leakage ≤1.5m³/(m·h). Acceptance records are established to achieve traceable management.

Opening treatment is key to waterproofing. Qinglong GRC system solutions eliminate leakage risks.