What Methods Are Commonly Used for Waterproofing GRC Curtain Walls? — Detailed Explanation of Waterproofing System Design and Construction Technology

Waterproofing treatment of GRC curtain walls is a key link in ensuring building functionality, requiring comprehensive implementation through multiple measures including material waterproofing, constructional waterproofing, and structural waterproofing. Based on 28 years of waterproofing engineering experience, Qinglong Group believes that high-quality GRC curtain walls should meet waterproofing standards of no leakage during rainstorms and no hidden risks over long-term use, providing reliable waterproofing protection for buildings through scientific waterproofing design and refined construction.

Panel joint waterproofing is the core link. A multi-layer sealing design is adopted: sealant is applied on the inner side, a drainage cavity is formed in the middle, and the outer side is sealed with weather-resistant sealant. In its Shenzhen project, Qinglong Group selected silicone sealant with a movement capability of ≥25% and a service life of more than 20 years. Sealant application requires strict control, with thickness at 0.5 times the joint width, applied full and continuous. The backer rod diameter should be appropriate to ensure the sealant forms the ideal shape. Joint design takes thermal deformation into account, with width determined by calculation to avoid seal failure caused by deformation.

Detail node waterproofing is crucial. Areas such as parapets and internal/external corners are prone to leakage and require reinforced treatment. Qinglong Group uses metal flashing to cover joints with an overlap length of ≥150mm, forming a continuous waterproofing layer. Sealing collars are installed around penetrations, allowing a certain degree of movement. The drainage system is rationally designed to avoid water accumulation. Through these measures, the waterproofing performance of GRC curtain walls is reliably guaranteed.

Regular maintenance preserves waterproofing effectiveness. Check the sealant for aging and replace it promptly. Clear drainage holes to keep them unobstructed. Qinglong Group recommends a comprehensive inspection every 3 years to ensure the waterproofing system remains effective. Scientific waterproofing treatment enables GRC curtain walls to be used reliably under various climatic conditions.