Preparing a deck for PVC roofing involves ensuring a smooth, stable surface to maximize the membrane’s lifespan and performance. Start by inspecting the decking itself—a plywood or OSB sheathing is typical, but it must be in good condition with no soft spots, rot, or damage. The sheathing should be securely fastened to prevent movement, as loose panels can lead to membrane wrinkling or punctures. Use corrosion-resistant fasteners suitable for the deck material, such as ring-shank nails or screws, spaced according to the manufacturer’s guidelines. The flatness of the deck is critical since PVC roofing membranes require a smooth base to prevent ponding water and ensure proper drainage. Check for any uneven areas or gaps by running a straightedge across the surface; areas that deviate more than 1/8 inch over 10 feet should be addressed through sanding, shimming, or replacing damaged sections.
Before calling in a professional, homeowners and roofers can perform a simple visual and physical check to spot obvious issues like loose decking or uneven spots. However, since PVC roofing requires strict adherence to manufacturer specifications, when in doubt, it’s best to consult a licensed roofer experienced with PVC installations. Asking your contractor about their approach to deck preparation is key: “How do you verify that the decking is sufficiently flat and secure before applying the membrane?” and “What type of sheathing and fasteners do you recommend to ensure compatibility with the PVC system?” These questions help ensure your roof’s foundation is properly prepared, safeguarding your warranty and the overall performance of your PVC roofing.