How to Deal with GRC Exterior Wall Joint Leakage: Cause Analysis and Effective Solutions

Water leakage in building exterior walls not only affects a building's appearance but also shortens the service life of the structure. As a common industry challenge, GRC exterior wall joint leakage has long been a focal concern for designers and owners. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain technical experience to analyze the root causes of leakage and provide systematic solutions, safeguarding building quality.

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

GRC (Glass Fiber Reinforced Concrete) is widely used for the exterior walls of landmark buildings thanks to its light weight, high strength, and flexible shaping, but improper joint treatment can easily become a leakage hazard. Based on Qinglong Group's practice across thousands of undertaken projects, leakage mainly stems from four factors: cracks caused by differential material shrinkage, such as mismatched drying shrinkage rates between GRC components and the base wall; sealant selection and application defects, including aging sealant strips and insufficiently filled joints; structural stress caused by installation precision deviations, such as joint deformation resulting from keel positioning errors; and material fatigue under extreme climate conditions, such as long-term freeze-thaw cycles accelerating joint aging. These problems are particularly prominent in high-end projects such as grand theaters and commercial complexes, requiring full-process control from design to construction.

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

To address GRC exterior wall joint leakage, Qinglong Group has established a full-chain prevention and control system covering "detailed design - manufacturing - installation - after-sales maintenance." In the design stage, BIM technology is used for parametric modeling to precisely calculate reserved joint widths, and sealing materials with compatible elastic moduli are selected according to the climate characteristics of the project location; in the production stage, automated production lines control the moisture content of GRC components to ensure shrinkage stability before leaving the factory; during construction, 3D laser scanning positioning technology is applied to achieve keel installation errors of ≤2mm, and the joint filling process strictly follows the "three coats and two fabric layers" standard; in the after-sales stage, a 5-year regular inspection service is provided, using infrared detection technology to identify potential leakage risks in advance. This system has been successfully applied in projects such as the Nanjing Road Century Plaza renovation project, achieving an industry-leading leakage rate of less than 0.5%.

Industry Experience Empowerment: Qinglong's Three Technical Advantages in GRC Joint Treatment

As a national high-tech enterprise, Qinglong Group has developed three core advantages in GRC joint treatment: first, material innovation—its independently developed elastic sealant offers weather resistance of over 20 years, suitable for extreme environments from -40℃ to 80℃; second, process upgrade—its original "stepped joint structure" design enhances the impermeability grade through multiple waterproof barriers; third, standard leadership—participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and incorporating joint treatment specifications into industry standards. This technical accumulation has enabled Qinglong GRC products to withstand high-temperature and high-humidity environments in overseas projects in Malaysia, Australia, and elsewhere, earning recognition in international markets.

Solving GRC exterior wall joint leakage requires systematically integrating material properties, construction techniques, and later-stage maintenance. Qinglong Group has always upheld the principle of "meticulousness and excellence," converting 28 years of full-chain experience into practical solutions, providing designers with the technical assurance to realize their creative visions and delivering architectural works that combine aesthetics with durability for owners. Choosing a professional GRC manufacturer is the key to avoiding leakage risks at the source and, more importantly, a long-term guarantee of building quality.