Key Drainage Design Points for Single-Curved GRC Panels Used on Roofs: Drainage Systems and Qinglong Group Roofing Engineering Practice

When single-curved GRC panels are used in roof drainage design, three key issues must be addressed: "curvature optimization, joint treatment, and flow guidance organization". Core indicators include drainage slope ≥2%, joint sealing grade ≥7, and drainage capacity ≥5L/(s·100m). In the single-curved roof project of the Shenzhen Pingshan High-Tech Zone Comprehensive Service Center, Qinglong Group optimized the curvature radius through CFD fluid simulation (minimum R=1500mm), adopted a "double-sealant joint" design for panel joints (internal and external sealant + drainage cavity), and installed stainless steel flow guide plates (thickness ≥1.2mm), ensuring no water accumulation on the roof under a once-in-a-century rainstorm intensity. Scientific drainage design is the lifeline of roof durability.

Coordinated design of curvature and slope. The longitudinal slope of single-curved roofs is ≥2%, and the transverse slope is ≥1%. We conduct rain-flow analysis through BIM models to optimize drainage paths. In the Nanning Wuxiang China Resources MixC One project, curvature adjustment shortened the water concentration time by 30%. Joints are a critical link in drainage, designed based on the "rain screen" principle, with panel joint width ≥15mm and drainage holes inside.

Detail construction determines success or failure. Stainless steel drip edges are installed at the eaves to prevent rainwater backflow. Gutter slope is ≥0.5% with depth ≥150mm. Qinglong Group's drainage system has withstood 10 years of testing with no leakage records.

Maintenance safeguards long-term performance. Regularly clean drainage holes and check sealant elasticity. Scientific design + regular maintenance ensure a worry-free roof for a hundred years.