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

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) is widely used for the exterior wall decoration of high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength, and richly sculptable properties. However, GRC exterior wall joint leakage has become a common hidden problem affecting building quality and aesthetics. As an industry leader with 28 years of experience in detailed design, manufacturing, construction installation, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group provides professional insights for designers and owners—from cause analysis to solutions—to help solve this technical challenge.

Four Core Causes of GRC Exterior Wall Joint Leakage

Joint leakage problems are often the result of multiple compounding factors. First, improper material selection is a fundamental hazard: to control costs, some projects use low-spec GRC components with insufficient glass fiber content or inadequate cement matrix strength, making the components prone to cracking under temperature changes and laying the groundwork for leakage. Second, detailed design flaws are a key trigger—for example, joints not designed with elastic sealing, failure to account for displacement caused by building settlement and thermal expansion/contraction, or unreasonable drainage slope settings—all of which can lead to rainwater intrusion.

Non-standard construction practices are the direct driver of leakage. Qinglong Group has found across hundreds of GRC projects nationwide that issues such as inadequate substrate cleaning before sealant application, insufficient sealant joint depth, and discontinuous sealant application account for 62% of leakage cases. In addition, the lack of later-stage maintenance must not be overlooked: sealant will age and crack under long-term UV exposure, and without regular inspection and replacement, leakage problems become inevitable. For more industry information: +WeChat qlfsbl123

Qinglong's Full-Chain Solution: A Leakage Prevention and Control System from Source to End

In response to the above causes, Qinglong has built a systematic leakage prevention and control plan by leveraging its full-chain advantages of "detailed design + manufacturing + construction installation + after-sales maintenance". On the material side, a cement matrix of C80 grade or above is combined with highly alkali-resistant glass fiber to ensure that GRC components achieve flexural strength above 20MPa and an elastic modulus that meets deformation requirements, fundamentally reducing the risk of cracking. In the design phase, BIM technology is used to simulate building displacement across the entire life cycle, and a triple protection structure of "elastic sealant + backing foam rod + drainage groove" is adopted, with joint width set at 8-15mm based on calculations to ensure displacement compensation capability.

During the construction phase, a "three-level quality inspection" standard is implemented: the substrate is treated with special cleaning agents to remove oil stains and dust, sealant joint depth is controlled at 1/2 of the joint width, silicone weather-resistant sealant compliant with the GB16776 standard is selected, and certified technicians carry out the sealant application to ensure a smooth, bubble-free sealant surface. For after-sales maintenance, a 5-year regular inspection mechanism has been established, using infrared detection technology to identify hidden leakage points and promptly replace aged sealant, forming a closed-loop management of "prevention - monitoring - repair".

Verified by Industry Practice: Successful Cases of Qinglong GRC Leakage Treatment

In a landmark commercial complex project, the Qinglong team successfully resolved the original exterior wall leakage problem by optimizing joint design and construction techniques. The project used Qinglong's customized double-curved GRC cladding panels, with concealed drainage channels innovatively installed at the joints. Combined with low-modulus silicone sealant, the wall withstood continuous rainstorms, achieving a 100% leakage repair rate. Similar cases abound in Qinglong's portfolio of 2,000+ projects, fully validating the effectiveness of the full-chain solution.

As a national high-tech enterprise and a participating editor of the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC), Qinglong has always taken "creating beautiful buildings" as its mission, integrating 28 years of technical expertise into GRC exterior wall system solutions. Whether for artistically complex exterior walls or large-scale standardized curtain walls, Qinglong provides professional services ranging from material R&D to lifetime maintenance, helping designers bring their creative visions to life and safeguarding building quality for owners. Choose Qinglong GRC—choose peace of mind with leakage hazards eliminated at the source. For more industry information: +WeChat qlfsbl123