Drainage Design Essentials for Single-Curved GRC Roof Panels: Coordinated Waterproofing and Drainage Solution

The core of drainage design for single-curved GRC panels used on roofs is "slope adaptation, path optimization, joint waterproofing, and material protection." Through scientific design, water accumulation and leakage are avoided; roof projects such as the Qinglong Hainan International Convention and Exhibition Center and the Ningbo International Conference Center have been in use for 8 years with no leakage issues.

I. Core Points of Drainage Design

Four key points ensure drainage performance. Slope adaptation: single-curved roofs have a slope of ≥3%, with ≥5% at small-curvature sections; Qinglong's slope design error is ≤0.5%, preventing water accumulation. Drainage paths: drainage direction is designed according to the single-curve geometry, with longitudinal drainage channels plus transverse drainage outlets; Qinglong's drainage channels are spaced at intervals of ≤3m, and drainage outlets at ≤6m. Joint waterproofing: splicing joints adopt a "tongue-and-groove + weather-resistant sealant" approach, with sealant elongation ≥500%; Qinglong's joint waterproofing depth is ≥15mm. Material protection: the surface of roof GRC panels is coated with fluorocarbon varnish to enhance water impermeability; Qinglong's protective layer achieves an impermeability of 1.5kPa.

II. Drainage Optimization for Special Areas

Targeted design for key areas. Corner sections: diversion channels are installed to guide water flow toward drainage outlets; Qinglong's corner diversion channels are ≥50mm wide. Around drainage outlets: the local slope is increased to 8%, and the drainage outlet diameter is ≥100mm; Qinglong's drainage outlets feature an anti-clogging design with built-in filter screens. Eave sections: drip lines are installed to prevent water backflow; Qinglong's drip lines are ≥20mm wide and ≥10mm high. Lap sections: upper panels overlap lower panels with a lap length ≥100mm; Qinglong adds extra sealant at laps for double waterproofing.

III. Qinglong Project Practice and Technical Advantages

Real-world projects verify drainage design effectiveness. Hainan International Convention and Exhibition Center: 120,000㎡ of single-curved roof GRC panels with rational drainage design, free of water accumulation and leakage; Ningbo International Conference Center landscaping project: the single-curved roof drainage system withstood rainstorms without water accumulation. Technical support: Qinglong participated in drafting the "GRC Roofing Engineering Technical Specification" and holds 3 patents related to drainage design. Material assurance: the sealant is highly weather-resistant silicone with a service life ≥10 years, and Qinglong provides an 8-year warranty on sealant. Commitment assurance: a 10-year warranty on the roof drainage system with free repair in case of leakage, ensuring long-term stability.