PVC flashing around chimneys is designed to create a watertight seal between the chimney structure and the roof surface, preventing water from seeping into your home. However, leaks often occur due to a few common issues such as improper installation, degraded sealants, or physical damage from weather and UV exposure. Over time, the flexible PVC material can shrink or crack, while chimney flashing that is improperly integrated with roofing materials often allows water to find a way underneath. Diagnosing a leak typically begins with a careful inspection around the chimney where water stains or mold may appear inside the attic or ceiling. A simple and safe DIY check involves visually inspecting the flashing for splits, gaps, or deteriorated sealants and gently running water over the area using a garden hose to see if it seeps inside. It's important to avoid walking on the flashing itself, as this can cause further damage or void warranties.
If you notice signs of deterioration or persistent leaks, it’s wise to call a professional roofer who has experience with both PVC flashing and chimney details. When discussing the problem with a contractor, ask if they will check the entire flashing system around the chimney, including any step flashing or counter flashing, to ensure it is properly sealed and fastened. Another helpful question is whether they recommend using a specific type of sealant or protective coating to extend the durability of the PVC flashing. A good roofer will also confirm that their repair work will maintain compliance with roofing manufacturer warranties and local building codes, helping ensure your roof’s long-term protection.