How to Fix GRC After Installation: Detailed Steps and Precautions Explained

**The Complete Guide to GRC Installation and Fixing: A 28-Year Industry Expert on Avoiding 90% of Construction Risks**

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) has become the material of choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its light weight, high strength, and flexible shaping. However, the process precision of the installation and fixing stage directly determines the safety and durability of the components. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group systematically breaks down the core steps and technical essentials of GRC installation and fixing in this article, providing professional solutions for designers, owners, and contractors.

**1. Preparations Before GRC Installation and Fixing: Details Determine Success or Failure**

The foundation of GRC installation and fixing lies in precise early planning. First, a structural substrate inspection must be carried out, using 3D laser scanning technology to obtain wall flatness data and ensure the error is kept within ±3mm—this is key to avoiding uneven loading of components later. Qinglong Group's Nanning production base has a professional detailed design team that can provide BIM model pre-assembly services tailored to project needs, simulating installation nodes in advance. For example, for double-curved GRC components, parametric design is used to optimize the distribution of anchoring points, keeping the load-bearing error per square meter within 5%.

The material preparation stage requires close attention to connector quality. Hot-dip galvanized Q235B steel is recommended for embedded parts, offering 300% better corrosion resistance than ordinary carbon steel. Paired with Qinglong's patented anti-loosening nuts (Patent No. ZL20XXXXXXXXX), they effectively cope with stress changes caused by building settlement. In addition, the site should be equipped with dedicated testing tools, such as torque wrenches (accuracy ±2N·m) and pull-out testers (range 0-50kN), to ensure the pull-out resistance of every anchoring point is no less than 15kN.

**2. Core Steps of GRC Installation and Fixing: The Standardized Process from Positioning to Anchoring**

1. **Precise Positioning**: Use a total station for axis setting-out, combined with Qinglong's self-developed modular positioning fixtures, to achieve a 3D installation deviation of ≤2mm. For large GRC curtain walls, it is recommended to set 3 reference control points every 100m² and calibrate in real time with an infrared line projector.

2. **Substrate Treatment**: Remove floating dust and debris from the structural surface, and apply a bonding agent (e.g., Qinglong JS-2000) to reinforce the substrate and raise bond strength above 1.2MPa. When substrate flatness deviation exceeds 10mm, special leveling mortar (Qinglong GRC-800) must be used to level the surface, with a curing period of no less than 7 days.

3. **Component Installation**: Choose the hoisting method according to weight; when a single piece weighs more than 50kg, four-point hoisting should be used, with a safety factor for lifting gear of no less than 5. The installation sequence follows the principle of "from bottom to top, from center to both sides," and adjustable supports are used for temporary fixing to keep verticality deviation ≤1.5mm/m.

4. **Anchoring Connection**: For concealed anchoring, a back-bolt connection system is preferred, with bolt embedment depth controlled at 2/3 of the GRC component thickness and no less than 50mm from the edge. Exposed joints must be concealed with decorative cover plates, and the gap between the cover plate and the component filled with silicone sealant (weathering grade ≥25 years), with sealant joint width controlled at 8-12mm.

**3. Key Precautions for GRC Installation and Fixing: A Veteran Engineer's Pitfall-Avoidance Guide**

Environmental factors have a significant impact on installation quality. When the outdoor temperature is below 5°C or above 35°C, work should be suspended to avoid installation errors caused by changes in the physical properties of materials. During the rainy season, proper rain protection is essential; sealant work must not be performed when the surface moisture content of a component exceeds 12%, otherwise debonding is likely to occur.

Differentiated solutions are needed for different building types: municipal projects must consider vehicle vibration, so it is recommended to add shock-absorbing washers at anchoring nodes; coastal areas require enhanced anti-corrosion treatment, with connectors made of 316 stainless steel; historic building renovation projects should use reversible connections to avoid permanent damage to the original structure. The Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), which Qinglong Group helped develop, clearly stipulates that in areas with a seismic fortification intensity of ≥8 degrees, anchoring nodes must undergo fatigue performance testing to ensure no failure under 500,000 load cycles.

**4. Acceptance and Maintenance: Building Long-Term Assurance of GRC Installation Quality**

After installation, three-stage acceptance is required: the initial inspection focuses on surface flatness (≤3mm/2m) and joint width (allowable deviation ±1mm); the second inspection uses the tapping method to check the hollowing rate (≤5%); and the final inspection involves an on-site water spray test (1 hour with no leakage). Qinglong's "QR code quality traceability system" enables data queries across the entire process for every component, from production to installation, providing a basis for later maintenance.

For after-sales maintenance, a full inspection once a year is recommended, focusing on sealant aging and the degree of corrosion of anchor bolts. For GRC components on high-rise buildings, drone inspections combined with infrared thermal imaging can be used to promptly detect hidden internal debonding. As a national high-tech enterprise, Qinglong Group offers a warranty commitment of up to 15 years, and its UHPC/GRC composite components have achieved a 20-year zero-maintenance record in projects such as Century Plaza on Nanjing East Road.

From detailed design to installation and fixing, every stage of a GRC project tests a supplier's professional strength. Built on 28 years of industry experience, Qinglong Group carries the philosophy of "meticulousness and the pursuit of excellence" throughout the entire chain, delivering safe and reliable GRC solutions for building projects worldwide through technological innovation and standardized construction. Choosing a professional manufacturer is not only a guarantee of project quality, but also a long-term investment in architectural aesthetics and durability.