Overall Repair Solution for Metal Roofs

2025-12-23

Wenrun PVC roofing sheets offer exceptional weather resistance, with a proven service life exceeding 25+ years. The sheets are also less affected by temperature, maintaining good low-temperature flexibility even at -40°C. After repairs, the finished white PVC roof reflects most solar radiation, reducing indoor energy consumption.

For the renovation of metal roofs, the owner requested that a PVC full-adhesion system be used for renovation if no insulation layer is added.

Procedure:

The PVC roll material is tightly bonded to the steel plate surface using a special weather-resistant adhesive. The overlaps are then hot-air welded, ensuring a strong and reliable joint that forms a seamless whole. As the base layer of the waterproofing system, the profiled steel sheet only requires cleaning of dust and rust. If the steel sheet is of poor quality or severely corroded, replacement is recommended.

Advantages:

Wenrun PVC waterproof membrane is lightweight and soft, effectively bonding to the corrugated steel sheet. The non-woven fabric backing not only isolates the membrane from the substrate but also enhances adhesion.

The membrane has a high elongation at break, adapting to substrate deformation.

The membrane joints are strong, resistant to aging and corrosion, reflect sunlight, and have energy-saving properties.

It requires fewer roof layers, has a lower load, is easy to install, and has strong wind uplift resistance.

It is unaffected by purlin spacing.

For projects involving the addition of insulation layers and complete roof renovation, PVC mechanical fixing systems can be used.

Procedure:

First, fill in the troughs of the existing metal roof panel, then lay a 0.6mm thick layer of Soprema self-adhesive SBS membrane; then install the polyester fiber reinforced PVC membrane on top of the insulation layer using mechanical fixing methods.

Advantages:

This approach significantly improves the roof's performance in terms of thermal insulation, waterproofing, noise reduction, and condensation prevention. The basic levels of mechanically fixed roof renovation systems are: