Discussion and Practice of Waterproofing Treatment Solutions for UHPC Panels Used on Roofs

**Discussion and Practice of Waterproofing Solutions for UHPC Panels Used on Roofs**

In modern architecture, UHPC (Ultra-High Performance Concrete) has gradually become an ideal material for integrating roof decoration and functionality, thanks to its high strength, high durability, and excellent formability. However, as the roof is a critical area for building waterproofing, the waterproofing treatment of UHPC panels directly affects the building's safety and service life. As an industry expert with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on its full-chain service experience—covering material properties, in-depth design, and construction techniques—has developed a systematic UHPC roof waterproofing solution.

**Core Challenges and Material Advantages of UHPC Roof Waterproofing**

Roof environments are exposed long-term to ultraviolet radiation, temperature variations, and rain and snow erosion, and traditional materials are prone to cracking, leakage, and other problems. With a compressive strength exceeding 200MPa and extremely low porosity, UHPC panels inherently offer excellent impermeability, yet their joints and anchoring nodes may still become weak points in waterproofing. Through material formulation optimization, Qinglong Group incorporates nano-scale silica fume and a fiber reinforcement system into UHPC, controlling the panel water absorption rate below 0.5%, laying a solid foundation for waterproofing treatment. Meanwhile, the lightweight nature of UHPC panels (density only 1/3 that of traditional concrete) reduces roof loads, indirectly lowering the risk of waterproofing failure caused by structural deformation.

**Full-Process Waterproofing Solution: Refined Control from Design to Construction**

Qinglong Group adopts the principle of "prevention first, multiple lines of defense" to build the UHPC roof waterproofing system. During the detailed design stage, BIM technology is used to simulate the impact of thermal deformation on panel splicing; a tongue-and-groove joint design with reserved elastic buffer space is adopted, combined with a dedicated weather-resistant sealant (temperature range -40℃~80℃) to establish the first line of defense. For anchoring locations, Qinglong has innovatively developed concealed stainless steel connectors, using flexible sealing between waterproof gaskets and panels to prevent leakage risks caused by corrosion of metal components.

During construction, Qinglong strictly implements the four-step process of "substrate treatment - waterproof coating - panel installation - sealing and finishing." The substrate is leveled with polymer cement mortar, and the surface is coated with a 2mm-thick Qinglong-customized waterproof coating developed specifically for UHPC, with a bonding strength to the panels of over 1.5MPa. Three-dimensional laser positioning technology is used during panel installation to ensure joint deviation ≤2mm. Finally, water-swellable waterstops are embedded at the joints, forming a dual guarantee of "sealant sealing + water stopping."

**Engineering Practice and Long-Term Maintenance: Technical Accumulation from 28 Years of Experience**

In a commercial complex roof project in Nanjing, Qinglong Group used UHPC panels to create a 3000㎡ irregularly curved roof, achieving five years of zero-leakage operation through the above waterproofing solution. The project adopts Qinglong's self-developed integrated design combining UHPC translucent panels with the waterproofing system, meeting architectural aesthetic requirements while ensuring long-term stable waterproofing performance through regular inspections (twice a year) and after-sales maintenance services. As a National High-Tech Enterprise, Qinglong participated in formulating the "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)," and its waterproofing treatment process has passed the scientific and technological achievement appraisal of the Ministry of Housing and Urban-Rural Development, with 12 related technical patents.

**Conclusion: Future Trends in UHPC Roof Waterproofing**

With the deepening of green building concepts, UHPC roof waterproofing will develop toward full life-cycle management of "materials - design - construction - operation and maintenance." Guided by its mission of "creating beautiful architecture," Qinglong Group continues to promote the composite application of UHPC with GRC, GRG, and other materials, providing designers and owners with one-stop services from design development to after-sales maintenance through modular production and intelligent construction technology. In the future, UHPC roofs will not only be the "fifth facade" of buildings, but will also become a model of green building materials that combine aesthetic value with waterproofing reliability.