TYPE | Commercial Buildings | LOCATION | Kunming |
MATERIAL | KIN FLAGO DR，JOYA FN EZFLEX，KINJOYA FM PLAIN，KINJOYA PU SYSTERM | YEAR | 2023 |
AREA | 80000㎡ |
Background
Located near Changshui International Airport in Guandu District, Kunming, Yunnan Province, the Kunming Yuntianyuan project is a modern integrated community combining residential, commercial, and public services with a total area of about 350,000 sqm. Kunming, situated on the Yunnan-Guizhou Plateau, has a humid climate with over 1000 mm of annual rainfall and high groundwater levels, presenting significant waterproofing challenges. Basements typically extend 8 to 12 meters deep, subjecting them to high water pressure. Significant diurnal temperature variations can also cause temperature stress cracks in the concrete structure.
Solution
The foundation used KIN FLAGO DR HDPE pre-applied waterproofing membrane. The roof used a composite system of JOYA FN EZFLEX non-curing coating and KINJOYA FM PLAIN SBS membrane. Interiors used KINJOYA PU series coating. For complex roof details, the composite system provided a continuous sealed layer. The PU coating was applied in three coats to interior floors, achieving a dry film thickness of at least 2mm. The KIN FLAGO DR HDPE membrane offers high puncture resistance for long-term humid underground conditions. The JOYA FN EZFLEX coating maintains flexibility from -20°C to 80°C. The FM PLAIN SBS membrane and the non-curing coating work synergistically, forming a rigid-flexible roof system with enhanced crack resistance and self-healing capabilities.
Outcomes
Continuous monitoring during the rainy season revealed no leaks in the basement, resulting in a first-time successful acceptance of the waterproofing. The roof passed a 24-hour water ponding test with no leaks and good drainage. Wet areas like bathrooms passed multiple rigorous water tests with a 100% pass rate. The waterproofing system is designed for a service life exceeding 25 years, matching the lifespan of residential buildings. The project achieved zero defect repairs upon delivery, significantly enhancing customer satisfaction and establishing a benchmark for finished residential waterproofing in the Kunming area.
