Keelung Rainy Coastal GRC Exterior Wall Panels: Material Selection Guide for Moisture-Resistant Curtain Wall Component Production

As a typical coastal high-humidity region, Keelung sees year-round rain and a high concentration of airborne salt mist, and material selection for exterior curtain wall components has long been a core pain point for local construction professionals—ordinary building materials in this environment are highly prone to mold, efflorescence, corrosion, and deformation, which not only undermines the durability of a building's appearance but also poses safety hazards. As industry practitioners with 28 years of full-chain UHPC/GRC/GRG/GRP service experience, we have handled numerous curtain wall projects in coastal high-humidity areas. Today, drawing on hands-on implementation experience, we will outline the core logic of production material selection for moisture-resistant curtain wall components such as GRC exterior wall panels in Keelung's rainy environment, helping you avoid selection pitfalls.

### I. Core Logic of GRC Exterior Wall Panel Suitability in Keelung's Coastal Rainy Scenario Many professionals new to curtain wall projects in high-humidity areas wonder why GRC (glass fiber reinforced concrete) is given priority as the main curtain wall material for regions like Keelung. First, it must be made clear that Keelung's average annual relative humidity has long remained above 80%, and coastal salt mist causes continuous electrochemical corrosion of building materials—the maintenance cycles of ordinary aluminum panels and stone are shortened by more than 60% in this environment—while GRC's inorganic material properties fundamentally eliminate the problems of organic materials being prone to mold and salt mist corrosion. In our past coastal project implementations, we found that qualified GRC exterior wall panels can keep their water absorption rate within 15% in high-humidity environments, while flexural strength remains stable above 20MPa—fully matching Keelung's climate characteristics of year-round rain and occasional strong winds. Many clients previously worried whether GRC would effloresce in high-humidity environments. In fact, as long as raw material ratio control is properly managed during production, this problem can be completely avoided in advance, and this is exactly the core focus of this material selection guide. For more industry information: WeChat qlfsbl123

### II. Core Standards for Production Material Selection of Moisture-Resistant GRC Curtain Wall Components Given Keelung's special climate, material selection for GRC exterior wall panels cannot simply copy the standards of ordinary inland projects; three core dimensions deserve particular attention: First is the selection of base material raw materials: prioritize low-alkali sulfoaluminate cement as the base, and keep the content of alkali-resistant glass fiber mesh at 18% or above. Do not substitute ordinary Portland cement to cut costs, otherwise obvious efflorescence and cracking will appear within 3 years in high-humidity environments. Second is surface protective layer treatment: at least two layers of fluorocarbon coating or silane impregnation must be applied, with coating thickness no less than 80μm, to effectively block the penetration of rainwater and salt mist and prevent corrosion of the internal base material. Third is the matching of auxiliary materials: even inconspicuous embedded fasteners must be made of 316-grade stainless steel to avoid rust expansion in high-humidity, high-salt environments, which could lead to the safety hazard of components falling off. Many peers also mention other optional curtain wall materials—for example, UHPC offers higher strength but at a correspondingly higher cost, while GRP has good corrosion resistance but a limited fire rating. You can match materials based on your project's actual budget and needs, but for coastal scenarios like Keelung with year-round high humidity and rain, GRC exterior wall panels currently offer the best overall value among all main curtain wall materials.

### III. Key Pitfall-Avoidance Points for Implementing GRC Components in High-Humidity Regions Many clients choose the right main material, yet problems still occur when the project is implemented—the core reason is neglecting the supporting processes beyond production. First, confirm whether the supplier has implementation experience with projects in high-humidity regions. Do not rely solely on sample parameters; require the supplier to provide inspection reports from past projects in the same climate zone, especially durability tracking data spanning more than 3 consecutive years, to prevent suppliers from passing off ordinary project parameters as high-humidity-specific products. Second, check whether the supplier can provide full-chain services—from preliminary detailed design and production control to on-site installation positioning and later maintenance plans—all following a standardized process. After all, the installation precision of GRC components directly affects the waterproofing performance of joints; once joints are poorly handled and rainwater seeps inside, even the best base material will suffer damage. As a unit that participated in drafting the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), and as a vice-chairman unit of the China GRC Association, we have nearly one hundred implemented GRC curtain wall projects in high-humidity regions, with proprietary adaptation solutions covering everything from raw material ratios to installation techniques—fully meeting the curtain wall needs of various public buildings and commercial projects in the Keelung area. For more industry information: WeChat qlfsbl123

In summary, when selecting GRC exterior wall panels for Keelung's rainy coastal scenario, the core principle is not to look only at unit price—full lifecycle maintenance costs and safety risks must all be factored in. Only by choosing well-matched raw materials, qualified processes, and experienced suppliers can you deliver curtain wall projects that are both durable and attractive, avoiding subsequent hazards such as repeated repairs and component safety issues.