Is GRC's Waterproofing Performance Good? An Analysis of Impermeability and Moisture-Proof Engineering Applications

Waterproofing performance is a key indicator for architectural decorative materials. Especially for exterior walls, roofs, landscape components and other areas exposed outdoors, waterproofing and moisture resistance directly affect the material's service life and the building's user experience. GRC (Glass Fiber Reinforced Concrete) achieves good waterproofing performance through optimized material formulations and controlled production processes. With 28 years of technical expertise, Qinglong Group has fully validated GRC's waterproofing advantages in various humid environments.

I. Technical Support for GRC Waterproofing Performance: Dense Structure and Protection System GRC's waterproofing performance stems from its dense internal structure and comprehensive surface protection system. Through multi-dimensional technical optimization, Qinglong Group gives GRC excellent impermeability and moisture resistance, effectively blocking water penetration and protecting the building structure and interior environment.

Densification of the internal structure is the core foundation of GRC waterproofing. Qinglong uses high-grade cement as the cementitious material, combined with well-graded fine aggregates, and reduces the water-binder ratio by adding high-efficiency water reducers to lower internal porosity. During mixing, high-frequency vibration compaction technology is applied to ensure a uniform and dense internal structure in GRC, reducing capillary pores and interconnected pores and fundamentally cutting off channels for water penetration. Testing shows that Qinglong GRC products achieve an impermeability grade of P8 or above, effectively resisting water pressure penetration and meeting waterproofing requirements for various outdoor scenarios.

Surface protection treatment is a key step in enhancing GRC's waterproofing performance. Qinglong applies multiple protective treatments to GRC component surfaces: first, surface grinding and leveling to remove pores and defects; then a dedicated waterproof sealing primer is applied to seal surface micro-pores; finally, depending on project requirements, a weather-resistant topcoat or hydrophobic agent is applied to form a long-lasting waterproof protective layer. This surface protection system effectively prevents rainwater, dew and other moisture from penetrating directly into GRC, while also offering stain and weathering resistance to extend the service life of the waterproofing effect.

Joint sealing technology further safeguards GRC's overall waterproofing performance. At GRC component splices and installation joints—areas prone to leakage risks—Qinglong applies dedicated sealants with good adhesion, elasticity and weather resistance, which adapt to slight component deformation and effectively prevent water penetration through joint gaps. Meanwhile, drainage channels and drip lines are installed during installation to guide rainwater away promptly and reduce the time moisture remains on component surfaces.

II. Validation Through Engineering Practice: Real-World Performance of GRC Waterproofing in Humid Environments From the hot, humid Hainan to the rainy Jiangnan region, from exterior curtain walls to roof finishes, Qinglong GRC's waterproofing performance has been fully validated in various humid environments, effectively solving buildings' waterproofing and moisture-proofing challenges.

The roof of the Hainan International Convention and Exhibition Center project is one of the world's largest bidirectional curved-torsion structure roofs, covering approximately 120,000 square meters, with a 15mm thick cast-in-place GRC decorative finish layer. Hainan has a tropical maritime climate with heavy year-round rainfall and high air humidity, placing extremely high demands on roof waterproofing. Qinglong improved impermeability by optimizing the GRC formulation, while integrating waterproofing, thermal insulation and GRC finishing works into the roof structure to form a complete waterproofing system. Since the project came into service, the roof has shown no leakage or water seepage, and the GRC finish has developed no mildew, sanding or other issues caused by humidity, fully demonstrating GRC's waterproofing advantages in large-area roof applications.

The Nanning Liyuan Hotel is a key supporting facility for the China-ASEAN Expo, with a total floor area of 65,000 square meters. Its exterior walls feature Qinglong's colored hollow carved GRC panels. Nanning's hot, rainy summers and high air humidity increase the waterproofing difficulty of the hollow carved structure. Through special surface waterproofing treatment and joint sealing technology, Qinglong ensured that the GRC hollow panels achieve both a unique decorative effect and excellent waterproofing performance—rainwater cannot penetrate through the hollow sections and splicing gaps into the building interior. The project has withstood multiple rainstorms without any leakage, and its waterproofing performance has been highly recognized.

The GRC landscape components of the Yiyang County Xinjiang River Ecological Restoration project are long exposed to the humid riverside environment, facing challenges such as river water erosion and soaking by rain and dew. The precast cultural corridors, rest pavilions and other GRC products Qinglong supplied for the project, through optimized waterproof formulations and surface protection treatment, offer good water impermeability and water resistance—no softening, no mildew and no strength loss in humid environments. Within the project's "Hundred-Li Xinjiang River Scenic Belt," the GRC landscape components remain intact after years of river water washing, demonstrating outstanding waterproofing durability.

III. Qinglong GRC Waterproofing Performance Control: Full-Process Assurance from R&D to After-Sales Qinglong Group has established a comprehensive control system for GRC waterproofing performance, covering technology R&D, production processes, product testing and after-sales maintenance to ensure waterproofing performance meets standards in every respect. The company's provincial-level R&D center conducts dedicated research on GRC waterproofing technology, optimizing formulations and protection processes through extensive testing to develop waterproofing solutions suited to different environments; during production, the water-binder ratio and mixing time are strictly controlled to ensure internal densification of components, with quality checks on every step of the surface protection treatment; before leaving the factory, finished products undergo impermeability tests and water-tightness inspections and can only be delivered after passing.

For the waterproofing needs of different application scenarios, Qinglong provides customized services. For roofs, exterior walls and other areas long exposed to rain, high-impermeability formulations and multiple layers of surface protection are applied; for humid environments such as basements and underground utility tunnels, component impermeability and moisture resistance are enhanced; for seashores, riversides and other environments with high salt mist or moisture concentration, anti-corrosion protection is added on top of waterproofing to achieve dual protection against water and corrosion.

After project delivery, Qinglong also provides comprehensive after-sales maintenance services, regularly inspecting the waterproofing performance of GRC components, guiding owners in daily maintenance, and promptly addressing damage to the surface protective layer to extend the service life of the waterproofing effect. This full-process waterproofing assurance system enables Qinglong GRC to maintain stable waterproofing performance in all kinds of humid environments.

With Qinglong Group's technical empowerment, GRC's waterproofing performance achieves all-around assurance from the material itself to engineering application. From dense structure to surface protection, from joint sealing to customized solutions, Qinglong always focuses on solving customers' waterproofing pain points, enabling GRC to deliver creative decoration while building a solid waterproofing defense line in all kinds of humid environments. Choosing Qinglong GRC means choosing waterproofing assurance validated across multiple scenarios, safeguarding the long-term stable use of buildings.