How to Address Joint Leakage Issues on GRC Exterior Walls: Cause Analysis and Systematic Solutions

A building's exterior facade is like the clothing of a city, and with its outstanding modeling capability and textural expressiveness, GRC materials have become the “haute couture” choice for many landmark buildings. However, joint leakage is like a stubborn “wrinkle” that not only affects a building's appearance but also erodes structural safety. As an industry leader with 28 years of deep expertise in the field of UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze the underlying logic of GRC facade joint leakage from a full-chain perspective and provide systematic solutions.

The Three “Invisible Killers” of GRC Facade Joint Leakage

In GRC facade projects, joint leakage is often not an “accidental incident” caused by a single factor, but the inevitable result of accumulated problems across design, materials, construction, and other stages. Based on Qinglong's experience with thousands of projects, the main causes concentrate in three areas: first, insufficient material compatibility—some projects use ordinary cement mortar for joint filling, whose elastic modulus differs greatly from that of GRC panels, making it prone to cracking under thermal stress; second, node design defects—traditional flat joints or right-angle splices fail to account for water flow paths and lack multi-layer waterproofing construction; third, non-standard construction practices, such as insufficient sealant application and inadequate substrate preparation, which lay hidden risks for leakage. Take a commercial complex project as an example: because an elastic sealing system was not adopted, obvious leakage traces appeared at the joints after just one winter-summer cycle.

Systematic Solutions: Full-Cycle Prevention and Control from Design to Maintenance

Solving GRC facade joint leakage requires building a full-chain prevention and control system of “prevention first, with prevention and treatment combined.” Leveraging the technical accumulation of its national-level R&D center, Qinglong has developed a mature solution: at the design stage, BIM technology is used for parametric node design to optimize joint construction, with pressure-relief cavities and drainage channels set up, along with specialized sealants matched to the elastic modulus of GRC panels; in production, the dimensional accuracy of GRC panels is strictly controlled to ensure uniform and consistent joint gaps, with water-spray tests conducted before leaving the factory; during construction and installation, a “three-level quality inspection” system is implemented to fully control key steps such as substrate cleaning, sealant joint filling, and caulking workmanship; in the after-sales maintenance stage, a regular inspection mechanism is established, using infrared detection and other technical means to promptly identify potential leakage risks. This solution was verified in the Nanjing East Road Century Plaza renovation project, which has had no leakage issues in the five years since delivery.

Qinglong GRC: Building a Solid Waterproofing Barrier Through Technological Innovation

As a national high-tech enterprise and a GRC industry standard-setting organization, Qinglong continues to innovate in the field of GRC facade waterproofing. Its independently developed “elastic composite sealing system” scientifically proportions specialized sealants with backing materials and can withstand ±50% joint movement; modular installation technology uses 3D laser positioning to keep joint tolerances within 0.5mm; combined with an RFID chip traceability system, every GRC panel can be quality-tracked throughout its full life cycle. These technical advantages have earned Qinglong GRC products high recognition in overseas projects such as the Petronas Twin Towers in Malaysia and the Sydney Opera House in Australia.

The quality of a building hides in the details of every joint. With 28 years of full-chain experience as its foundation, Qinglong Group integrates its commitment to “meticulousness and excellence” into every aspect of GRC facade projects, offering designers a reliable choice for bringing creativity to life while safeguarding the long-term value of buildings for owners. Choosing a professional GRC manufacturer means avoiding leakage risks at the source and letting architectural beauty endure through the years.