PVC roofing and ridge vent leaks commonly occur due to improper installation, deteriorated seals, or physical damage to the materials. PVC roofs are single-ply membranes known for flexibility and chemical resistance, but if seams are not properly welded or the membrane is punctured, water can penetrate underneath. Ridge vents, designed to provide attic ventilation, can leak if the vent cover is cracked, flashing is damaged, or if sealant around the vent deteriorates. Leaks often appear as water stains in the attic or dripping near the ridge line after heavy rain. Simple DIY checks include visually inspecting the ridge vent for obvious cracks or shifts, and looking for gaps or loose flashing. On the PVC membrane, examine seams firing, check for blisters, punctures or gaps, especially after storms or heavy wind, which could have caused movement or tears.
If these simple inspections reveal no obvious issues or if you’re uncomfortable getting on the roof, it’s wise to call a professional roofer who specializes in PVC roofing and ventilation. Ask them specifically about how they confirm proper seam welding or flashing integrity and whether they include a warranty on their repairs to ensure long-term leak prevention. You might want to ask, “Can you show me how you verify the ridge vent flashing is watertight?” and “Do your repairs come with a warranty that covers seam failure or leaks over time?” These questions help ensure the roofer uses code-compliant methods and quality materials that won’t void the manufacturer’s PVC warranty, protecting your investment while addressing leaks safely.