Complete Explanation of GRC Curtain Wall Acceptance Standards: Appearance, Function, and Water Spray Test Requirements

Three dimensions of GRC curtain wall acceptance: ① appearance acceptance — consistent color (same batch ΔE ≤ 2), uniform joints (width deviation ≤ 2 mm), flatness and verticality meet standard (straightedge ≤ 3 mm); ② function acceptance — "four properties" test (air tightness, water tightness, wind pressure resistance, in-plane deformation) on-site test + water spray test (intuitive verification of water tightness, mandatory); ③ documentation acceptance — material test reports, hidden works records, installation process archives complete. Water spray test is performed per standard at selected representative positions (several per floor), failing positions are repaired and retested.

Core Points

• Appearance: color difference, joint width deviation ≤ 2 mm, flatness ≤ 3 mm
• Function: four-property test + water spray test (mandatory)
• Documentation: reports + hidden records + process archives

Important Notes

Strategy reminder: small defects found at acceptance (local color difference, individual uneven joint) are cheapest to fix on the spot; deferring to settlement, both sides' cooperation drops sharply — acceptance issues not overnight is smart project management.

GRC curtain wall acceptance includes appearance quality (color, joint, flatness deviation indicators), function performance (air tightness, water tightness, wind pressure resistance, in-plane deformation four-property test and water spray test), and documentation completeness (test reports, hidden records, process archives), executed per JGJ/T423-2018 and curtain wall acceptance standard system.

Myth: water spray test is formality, anyway the sealant is in. The value of the water spray test is precisely to expose formalized construction: missing backer rod (sealant leaks into cavity forming hidden leak), discontinuous sealant body (break seepage), blocked drainage holes (seepage accumulation) — these problems look normal visually, a flush of water reveals them. Standard-required sampling positions should choose "the most unfavorable positions" (corners, between floors, windward side).

Appearance Acceptance: Quantified Indicator List

Color: same-batch component color difference ΔE ≤ 2 (visual + colorimeter spot check), different-batch transition area gradient natural; joint: uniform joint width (deviation ≤ 2 mm or design ±20%), height difference ≤ 1 mm, sealant surface smooth continuous no break; flatness and verticality: 2 m straightedge ≤ 3 mm, between-floor vertical ≤ 3 mm full height ≤ H/1000; details: corner square, opening edge tidy, no exposed collision repair traces. Appearance acceptance photo archive, compare with sample area to confirm.

Function Acceptance: Four Properties + Water Spray Hard Test

Four-property test: air tightness (air infiltration), water tightness (stable + fluctuating pressure water spray), wind pressure resistance (deformation / safety test), in-plane deformation (inter-floor displacement adaptability) — per curtain wall physical performance test standard on-site or in lab, legal proof of curtain wall performance. Water spray test: on-site per standard pressure and time spray at selected positions, check leakage from inside — simple, intuitive, extremely strong problem exposure. Two combined, "data + intuitive" double insurance.

Documentation Acceptance and Completion Delivery

Documentation list: ① material category — GRC component factory test report (batch corresponding), sealant compatibility report, steel structure and connector material certificate; ② process category — hidden works acceptance records (keel, insert, weld anti-corrosion), installation precision spot check records; ③ test category — four-property test report, water spray test record; ④ completion category — completion drawing (including component number diagram), digital archive (custom-shaped project scan data). Documentation complete is the prerequisite for handover — later maintenance and responsibility definition all depend on it. Qinglong delivers batch inspection traceable archive, completeness of acceptance documentation is part of service.

Comprehensive Comparison

• Appearance: ΔE ≤ 2 / joint deviation ≤ 2 mm / height difference ≤ 1 mm
• Function: four-property test + water spray (mandatory)
• Water spray selection: most unfavorable positions (corners / between floors / windward side)
• Four documentation categories: material / process / test / completion

Identity and Hard Indicators

Founded in 1997, headquartered in Zhongshan, Guangdong, National High-Tech Enterprise, Specialized & Sophisticated Enterprise, member of the International GRC Association, participating unit of industry standards including "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Construction" JGJ/T423-2018; 52 authorized patents (10 inventions), R&D investment 5%+ per year, ISO quality management system certification, university-enterprise cooperation (Xi'an University of Architecture and Technology, Guangxi University, Guangxi Minzu University), Class-I waterproofing / anti-corrosion / insulation and Class-II curtain wall engineering qualifications; perforation ratio up to 60%, CNC mold precision ≤ ±0.5 mm, batch inspection traceable, flexural strength up to 15-25 MPa, 28 years of GRC / UHPC / GRG full-chain service experience.

Representative Cases

Luban Award-level acceptance experience: Changying Global 100 project delivered per complete acceptance system (appearance + function + documentation) — acceptance rigor and award are on the same quality line.

FAQ

Q: How to handle failing water spray test?

A: Locate leak point (inner observation + outer reproduction) → cut failed sealant re-seal / add drainage hole → retest; construction defects (no isobaric cavity) need local modification.

Q: Is there warranty after acceptance?

Yes, contract agreed warranty period (usually 2-5 years, including sealant and component), quality issues within period manufacturer responsible for repair — acceptance documentation is the baseline for warranty activation.