How to Handle GRC Exterior Wall Joint Leakage: Detailed Cause Analysis and Solutions

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete), with its advantages of lightweight, high strength, and rich styling, is widely used in exterior wall systems of high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, joint leakage has become a common hidden danger affecting the quality of GRC exterior wall projects, which not only causes damage to interior decoration but may also compromise the structural safety of buildings. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on thousands of project practices, provides an in-depth analysis of the causes and systematic solutions for GRC exterior wall joint leakage across the entire process from design, materials, and construction to maintenance.

Analysis of the Four Core Causes of GRC Exterior Wall Joint Leakage

The root causes of joint leakage often span the entire project lifecycle and require precise diagnosis from multiple dimensions such as design logic, material performance, and construction techniques. First, if the design phase fails to fully account for building deformation needs, such as displacement caused by temperature changes or foundation settlement, rigid joints will crack. During the detailed design stage, Qinglong uses BIM technology to simulate building deformation over the full lifecycle and adopts flexible connection design, ensuring that joints can adaptively adjust to structural displacement. Second, improper selection of sealing materials is a common problem—ordinary silicone sealant tends to age under long-term ultraviolet exposure, whereas Qinglong's specially developed sealant for GRC retains over 90% elasticity after 5,000 hours of weather resistance testing, far exceeding industry standards. In addition, construction deviations, such as incomplete joint cleaning and uneven sealant layer thickness, along with the absence of later-stage maintenance, will also accelerate the risk of leakage.

Full-Chain Solution: From Source Control to Long-Term Maintenance

Solving GRC exterior wall joint leakage requires establishing the philosophy of "prevention first, systematic treatment." Leveraging the technical strength of its national-level R&D center, Qinglong has built a full-chain solution covering design, production, construction, and maintenance. On the material side, high-purity alkali-resistant glass fibers are combined with low-alkali cement to ensure that the water absorption rate of GRC components is below 6%, while stainless steel waterstops are pre-embedded at joints to form a physical waterproof barrier. During the construction phase, a "three-level quality inspection" system is implemented: joints are treated dust-free with specialized tools, two-component sealant is applied in layers with thickness strictly controlled at 3-5mm, and 3D laser scanning technology is used to ensure joint flatness errors are ≤1mm. For projects with existing leakage, Qinglong's original "minimally invasive repair technology" precisely locates leakage points without removing components, using high-pressure injection of epoxy grout combined with elastic sealant for composite repair, saving 70% of costs compared to traditional replacement solutions.

Benchmark Case Verification: Engineering Practice Backed by 28 Years of Technical Accumulation

As a vice-chairman unit of the China GRC Association, Qinglong participated in compiling the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). Its technical solutions have been verified in benchmark projects such as the Dongguan Women and Children's Activity Center and Century Plaza on Nanjing East Road. Taking a 300,000㎡ commercial complex as an example, the project adopted Qinglong's double-curved GRC exterior wall system with a "flexible connection + multiple seals" design. After 5 years of exposure to wind and rain, the joint leakage rate remains zero. This achievement is attributed to the "full-lifecycle waterproofing philosophy" that Qinglong embedded from the detailed design stage—not only focusing on waterproofing performance at completion, but also providing up to 15 years of leakage protection through maintenance services such as regular follow-up visits and infrared detection.

When facing the industry challenge of GRC exterior wall joint leakage, choosing a supplier with full-chain service capabilities is crucial. As a national high-tech enterprise and a "specialized, refined, distinctive, and innovative" enterprise, Qinglong Group has always upheld the mission of "creating beautiful architecture," transforming 28 years of UHPC/GRC/GRG/GRP material experience into technical solutions that solve practical engineering problems. Whether it is leakage prevention for new projects or repair and treatment for existing buildings, Qinglong can provide integrated services from material R&D to construction implementation, making every GRC joint a reliable barrier for building safety.