How to Handle Joint Leakage in GRC Exterior Walls: Cause Analysis and Solution Discussion

As the building's "first line of defense," the waterproofing performance of exterior walls directly affects building safety and durability. Among the many exterior wall decoration materials, GRC (Glass Fiber Reinforced Concrete), with advantages such as light weight, high strength, and versatile styling, is widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, joint leakage has become a common pain point affecting the quality of GRC exterior wall projects, which not only affects the building's appearance but may also cause internal structural damage. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on more than a thousand engineering projects, thoroughly analyzes the root causes of GRC exterior wall joint leakage and provides systematic solutions.

Four Core Causes of GRC Exterior Wall Joint Leakage

Unreasonable joint design is the primary hidden danger of leakage. Some projects fail to fully consider the thermal expansion and contraction characteristics of GRC components during the design phase, with insufficient joint width or no elastic design, causing components to compress and deform under temperature changes and sealing materials to tear. Secondly, improper material selection aggravates leakage risks. For example, ordinary cement mortar used for joint filling is rigid and cannot accommodate substrate movement, making it prone to cracking; inferior sealants, on the other hand, may age and debond within a short time due to insufficient weather resistance. Non-standard construction practices are equally significant—for example, incomplete joint cleaning, insufficient sealant filling, and failure to perform substrate treatment as required can all leave channels for leakage. In addition, lack of later maintenance is another important factor. During long-term use, the sealant on GRC exterior walls gradually ages; if it is not inspected and replaced regularly, rainwater will seep in through the gaps.

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

To address GRC exterior wall joint leakage, Qinglong Group leverages its full-chain advantages in detailed design, manufacturing, construction and installation, and after-sales maintenance to build a solution featuring "prevention first and systematic treatment." At the design stage, BIM technology is used for parametric modeling to precisely calculate deformation caused by temperature differences, optimize joint width and structural forms, and recommend a composite waterproofing system of "elastic sealant + backing material" to ensure that joints have sufficient deformation capacity. In material selection, Qinglong insists on using high-quality GRC panels that comply with the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), paired with silicone sealants with weather resistance of more than 20 years, ensuring material performance at the source.

During construction, Qinglong strictly implements the "Three Cleanings and Three Checks" standard: cleaning joint debris, substrate oil stains, and surface dust; checking sealant compatibility, construction ambient temperature, and joint filling depth. Through 3D laser scanning positioning technology, the installation accuracy error of GRC components is controlled within ±2mm, creating a solid foundation for joint waterproofing. For large and complex projects, Qinglong also provides customized construction methods, such as double sealing, rain screen drainage and other innovative technologies, to further improve waterproofing reliability.

After-sales maintenance is key to long-term waterproofing. Qinglong has established a nationwide maintenance team that provides customers with regular inspection services, assesses sealant aging through professional testing equipment, and promptly replaces failed materials. For overseas projects, Qinglong Malaysia Building Materials Co., Ltd. can also provide rapid response to ensure the long-term stable operation of GRC exterior walls.

Industry Practice and Brand Commitment: Safeguarding Building Safety with Technological Innovation

As a National High-Tech Enterprise and a drafting unit of the industry standard General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components, Qinglong Group has always regarded technological innovation as the core driving force for solving industry pain points. In benchmark projects such as the Dongguan Women and Children's Activity Center and Century Plaza on Nanjing East Road, Qinglong achieved outstanding performance with zero exterior wall leakage by optimizing GRC joint design and construction techniques, winning multiple industry recognitions including the "AALBORG WHITE Cup GRC/UHPC Construction Engineering Innovation Award."

"Meticulous attention to detail and constant pursuit of excellence" is the commitment of Qinglong people. Facing the industry-wide challenge of GRC exterior wall joint leakage, Qinglong Group will continue to leverage its full-chain service advantages, providing designers and owners with one-stop solutions from scheme design to later maintenance, safeguarding the safety and beauty of every building with professional technology, and fulfilling its corporate mission of "creating beautiful architecture."