Careful attention must be paid to the details when installing PVC-coated steel roofing tiles, as their lightweight nature makes them prone to issues such as leaks, loosening, and being blown off. The key lies in the preparation of the substrate and the fastening method: the spacing between the purlins should be 60–80 centimeters, and the tiles should be secured with self-tapping screws fitted with waterproof washers; the screws should not be overtightened. The overlap at seams should be at least 10 centimeters, and the direction of the overlap should be opposite to the prevailing wind direction to prevent rainwater from flowing back into the roof. Edge trim must be installed at the eaves and ridge to secure...
