In my country, steel structure roofs generally employ self-waterproofing, relying on the waterproofing structure between the panels. However, due to climate change and the thermal expansion and contraction of steel, localized leaks are prone to occur, especially in southern regions. Leaks mainly occur at the overlap of profiled panels, roof skylights, and the connection between the steel eaves gutter and the cement wall.

By laying insulation boards on the steel roof layer and then using PVC waterproof membrane, a complete waterproof layer can be formed on the outer layer of the original roof, thereby enhancing the waterproofing capability of the steel structure roof.

PVC is a thermoplastic material. Due to its mechanical properties, chemical stability, good cold resistance, and fire retardancy, PVC has become the most widely used plastic product in construction. PVC waterproof membrane is made from PVC resin as the main raw material, with the addition of various chemical additives, through processes such as mixing and extrusion molding. It can be used for various industrial and civil building roofs, underground waterproofing projects, factory roofs, and other waterproofing projects.

What are the characteristics of PVC waterproof membrane?

1. High tensile strength, good ductility, low shrinkage, and good dimensional stability;

2. Excellent resistance to aging, chemical corrosion, and root penetration;

3. Good weldability; after hot air welding, the joints become integrated with the substrate, and there is no peeling or detachment at the overlaps;

4. Good water vapor diffusion, allowing for easy release of condensate;

5. Good flexibility in both high and low temperature environments, and good adaptability to environmental temperature changes;

6. Made with environmentally friendly raw materials and technology, causing no environmental pollution, long service life, and easy maintenance.

   
   

   
   

What are the construction techniques for PVC roll materials?

To ensure optimal waterproofing, it is crucial to pay attention to key construction points during the installation of the waterproof membrane, and for a professional construction team to perform the work according to the established procedures. Our professional construction team continuously summarizes experiences and lessons learned during the construction process, improving roof waterproofing technology to guarantee the best waterproofing effect from the waterproof membrane.

There are three installation methods for PVC waterproof membranes: mechanical fixing method, full adhesion method, and loose laying method. Seams are welded using a hot air welding process.

1.Construction process of mechanical fixing method: base surface cleaning → laying polyethylene film and insulation board → pre-laying PVC waterproof membrane → fastening with fasteners → hot air welding → reinforcement of joints → inspection and repair → acceptance.

2. Full Adhesion Method Construction Process: Base surface cleaning → Positioning and marking lines → Applying adhesive to the main surface → Laying the roll material → Roll material overlap → Reinforcing joints → Finishing → Acceptance inspection.

3. Loose-lay method construction process: base surface cleaning → pre-laying waterproof membrane → hot air welding of waterproof membrane → reinforcement of joints → inspection and repair → acceptance.

PVC waterproof membranes, with their excellent anti-aging, corrosion resistance, and temperature adaptability, are poised to become a significant future development direction for waterproofing steel structure roofs. Furthermore, in the renovation of old buildings and the maintenance of existing steel structure roofs, PVC membrane waterproofing is far more economical and reliable than replacing roof panels, demonstrating its advantages. It is believed that with improvements in production processes and increased output, PVC waterproof membranes will see even wider application and development.