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

As the "first line of defense" of a building, the waterproofing performance of the exterior wall directly affects the building's safety and durability. GRC (Glass Fiber Reinforced Concrete), with its advantages of light weight, high strength, and rich styling, is widely used in high-end buildings such as grand theaters and commercial complexes, yet joint leakage has become a common pain point affecting its performance. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on more than 1,000 engineering projects to provide an in-depth analysis of the causes of GRC exterior wall joint leakage and systematic solutions, offering professional technical reference for designers and owners.

Analysis of the Core Causes of GRC Exterior Wall Joint Leakage

GRC exterior wall joint leakage is not caused by a single factor, but results from the combined effects of material properties, design details, and construction techniques. From the material perspective, GRC components undergo slight deformation under changes in temperature and humidity; if the joint design does not reserve sufficient space for expansion and contraction, cracking is likely to occur. The sealant selected in some projects has insufficient weather resistance and will age and fail after long-term exposure to ultraviolet rays and rain erosion. In the design phase, improper treatment of waterproofing details is a key trigger, such as failure to set up multiple waterproof barriers, insufficient drainage slope leading to water accumulation, or poorly sealed anchor fixings forming "water channels". Non-standard operations during the construction phase should also not be overlooked — incomplete joint cleaning, insufficient sealant filling, and installation precision deviations all create hidden risks of leakage.

Full-Chain Solution: A Leakage Prevention and Control System from Design to Maintenance

To address the complexity of GRC exterior wall joint leakage, Qinglong Group has established a full-chain prevention and control system covering "design - production - construction - maintenance". In the detailed design phase, BIM technology is used for parametric modeling to accurately calculate the thermal expansion and contraction of components, optimize joint width and structural forms, and include as standard a triple waterproofing structure of "elastic sealant + backing material + drainage groove". In production, the water-cement ratio and fiber content of GRC components are strictly controlled to ensure a product flexural strength of 20MPa or above, while factory-prefabricated standardized joint accessories reduce on-site processing errors. During construction, the "3D laser scanning positioning + modular installation" process is adopted to ensure joint alignment accuracy with an error of ≤2mm, and Qinglong's specially formulated weather-resistant sealant (temperature resistance range of -40℃~120℃) is applied together with mechanical injection to ensure the sealant is full and bubble-free.

Industry Case Verification: Leakage Treatment Practice Backed by 28 Years of Technical Expertise

As a National High-Tech Enterprise and a participant in the formulation of GRC industry standards, Qinglong Group has successfully solved the leakage challenges of complex-shaped GRC exterior walls in benchmark projects such as the Nanjing East Road Century Plaza renovation and the Dongguan Women and Children's Activity Center. Taking a landmark commercial complex as an example, the joints of its double-curved GRC exterior wall adopted an innovative design of "stepped drainage + replaceable sealant strips", quickly discharging infiltrated water through preset drainage channels. Combined with Qinglong's patented anchor fixing sealing technology, this achieved a zero-leakage record for 5 years after delivery. The solution was incorporated into the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018) and has become an industry model.

Preventing GRC exterior wall joint leakage requires systematic thinking throughout the entire life cycle. Qinglong Group always upholds the values of "honesty, hard work, trust, and collaboration", transforming its 28 years of full-chain experience into integrated service capabilities from material R&D to after-sales maintenance. For designers and owners, choosing a professional GRC manufacturer with detailed design capabilities, production strength, and engineering experience is the key to avoiding leakage risks at the source. Going forward, Qinglong will continue to drive technological innovation in UHPC/GRC/GRG/GRP materials, providing stronger technical support for its mission of "creating beautiful architecture".