How to Waterproof UHPC Curtain Walls in Humid Regions: Key Technologies and Practical Applications

Waterproofing is the lifeline of building curtain walls in humid regions, and UHPC (Ultra-High Performance Concrete), with its outstanding mechanical properties and durability, is becoming the ideal choice for high-end curtain walls. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will systematically analyze waterproofing solutions for UHPC curtain walls in humid environments—from material properties and process innovation to engineering practice—providing full-chain technical support for designers and owners.

The natural environment of humid regions poses severe challenges to curtain wall waterproofing: high temperature and humidity readily cause material aging, while rainwater penetration triggers structural corrosion—traditional curtain wall materials often struggle to balance strength with waterproofing performance. UHPC material itself features an extremely low porosity (typically below 1%) and excellent impermeability, and its dense internal microstructure provides a natural advantage for waterproofing. Verified through 28 years of engineering practice, Qinglong Group has demonstrated that in tropical marine climate regions (such as projects in Malaysia and Singapore), the water seepage rate of UHPC curtain walls is reduced by more than 60% compared with traditional stone curtain walls, fully demonstrating the material's inherent waterproofing potential.

Achieving waterproofing of UHPC curtain wall systems requires building multiple lines of defense from the design source. Qinglong Group innovatively adopts a trinity technical system of “material waterproofing + structural waterproofing + joint waterproofing”: at the material level, by incorporating nano-silane waterproofing agents to optimize the UHPC mix ratio, the surface contact angle is raised above 110°, forming a lotus effect; in structural design, a combination of inclined drainage channels and concealed water guide holes ensures rapid rainwater discharge; for joint treatment, Qinglong's patented double-sealing technology (Plan No. 2024-0232T-JC, a technology supporting industry standards) applies composite sealing with EPDM rubber strips and structural adhesive, solving the pain point of traditional single-seal failure.

Detailed design is the key link in delivering waterproofing results. Relying on the R&D strength of its provincial engineering technology center, Qinglong Group deeply integrates BIM technology with parametric design. In the Nanjing East Road Century Plaza renovation project, a curtain wall drainage simulation model was built with Rhino+Grasshopper to precisely calculate the drainage slope and water guide path of each panel. Addressing the joints between UHPC panels—a weak point in waterproofing—the Group innovatively developed a mortise-and-tenon tongue-and-groove connection structure, combined with embedded water-stop strips, extending the waterproofing life at the joints to more than 20 years, far exceeding the industry average.

Construction workmanship directly determines the final performance of the waterproofing system. Qinglong Group has established a strict construction quality control system: UHPC panels undergo a 72-hour water immersion test before leaving the factory to ensure water absorption ≤3%; on-site installation uses 3D laser scanning positioning technology with errors controlled within ±2mm to avoid waterproofing failure caused by installation deviations; and specially addressing the typhoon-prone characteristics of humid regions, wind-pressure-resistant reinforcement joints have been developed, verified by third-party testing to withstand Category 12 typhoon loads. These process standards have been incorporated into the formulation of the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)”.

Full lifecycle waterproofing assurance is the core advantage of Qinglong's services. As a national high-tech enterprise providing full-chain services covering detailed design, manufacturing, construction and installation, and after-sales maintenance, Qinglong Group establishes digital archives for each UHPC curtain wall project, achieving dynamic assessment of waterproofing performance through regular drone inspections and sensor monitoring. In projects such as the Dongguan Women and Children's Activity Center, the after-sales maintenance system has promptly identified and addressed minor leakage risks, ensuring the long-term stable operation of the curtain wall system in humid environments.

Waterproofing of UHPC curtain walls in humid regions is a systematic project requiring the coordinated efforts of material innovation, design optimization, refined construction, and service assurance. Founded on 28 years of industry experience, Qinglong Group will continue to uphold the philosophy of “meticulousness and excellence” and, through the deep integration of technological R&D and engineering practice, provide UHPC curtain wall solutions combining aesthetic appeal and waterproofing performance for more high-end buildings, contributing to the fulfillment of its corporate mission of “creating beautiful architecture”.