PVC roofs, commonly used in commercial and some residential buildings, require good ventilation to prevent heat buildup and moisture problems that can shorten the roof’s life. Proper ventilation helps regulate temperature and humidity under the membrane, reducing the risk of condensation that can cause damage over time. Poor ventilation can lead to the roof membrane becoming brittle or the adhesive failing, which affects the water-tightness of the PVC roof. One simple way to check ventilation is by inspecting the attic or roof deck space for signs of dampness or mold. You can also look for excessive heat or noticeable smells, especially after rain. Safe DIY checks involve ensuring that soffit vents and ridge vents (if installed) are clear of debris and not blocked by insulation.
If you suspect ventilation is insufficient or your roof is aging, it’s wise to call a professional roofing contractor with PVC experience. When consulting a roofer, ask how their recommended ventilation system will prevent heat and moisture buildup under your specific PVC roof and if their solution complies with the manufacturer’s installation and warranty guidelines. Also, inquire whether they will provide documentation that verifies proper ventilation upon completion. Proper ventilation isn't just about comfort—it protects your investment and keeps your warranty intact. A roofer can assess your building’s unique conditions and recommend modifications, such as adding vents or using mechanical ventilation, to ensure your PVC roof performs well over time.