How to Waterproof UHPC Curtain Walls in Humid Regions?

Waterproofing of UHPC curtain walls in humid regions requires a systematic solution combining "drainage, sealing, and prevention." The waterproofing system developed by Qinglong Group through projects in high-temperature, high-humidity regions such as Hainan and Southeast Asia ensures curtain wall reliability in environments with annual rainfall of 2000mm.

Pressure-equalized cavity design is the first line of defense for waterproofing. By providing an air layer between the outer UHPC panels and the inner structural wall, internal and external pressures are balanced, fundamentally eliminating the driving force for rainwater penetration. In the Haikou International Convention and Exhibition Center project, we combined the pressure-equalized cavity with the building ventilation system, addressing both moisture protection and energy efficiency.

Selection of joint waterproofing materials requires particular care. Qinglong recommends weather-resistant silicone sealant with a movement capability of ≥25%. In the Ho Chi Minh City project in Vietnam, we used two-component silicone sealant, mixed on site to ensure deep-curing quality. Drainage holes are provided behind all joints to promptly discharge any rainwater that may penetrate.

Panel surface waterproof coatings require regular maintenance. Nano-modified fluorocarbon coatings offer durability of up to 10 years in humid environments. The self-cleaning coating used by Qinglong in the Yangshengtang Pharmaceutical Hangzhou Industrial Park keeps the surface water contact angle above 110° at all times. Coating performance testing every 5 years is recommended, with timely recoating.

The innovatively developed "breathing" waterproofing system is now being promoted. Smart humidity sensors installed on the exterior wall automatically activate a moisture discharge device when excessive cavity humidity is detected. After this system was applied in the National Service Center project in Singapore, indoor relative humidity has been kept below 60% year-round.