Architectural shingles, known for their layered, dimensional appearance, are a durable roofing choice, but they still rely heavily on proper flashing to prevent leaks around chimneys. Chimney flashing is a metal barrier installed where the roof meets the chimney to direct water away and keep it from seeping into the roof structure. Leaks often happen because flashing can corrode over time, become loose, or get damaged during severe weather or poor installation. Another common issue arises when the shingles around the chimney are not properly sealed or underlapped, allowing water to slip beneath the layers. Simple DIY checks involve looking for rust, cracks, or gaps in the metal flashing, and inspecting the shingles near the chimney for curling edges or missing sealant strips. If you notice water stains or damp spots inside your attic or on walls near the chimney, that's a clear sign the flashing may be compromised.
If you have any doubts about your assessment or if your simple checks reveal potential damage, it’s best to call a professional roofer. They can safely remove and replace faulty flashing and reseal shingles to restore the roof's waterproof barrier. When consulting a contractor, ask specifically how they will ensure the flashing is properly sealed to accommodate roof movement without cracking, and whether they use corrosion-resistant metals like aluminum or copper for durability. Also, inquire about their warranty on the flashing work, as roofs can shift and settle, requiring a contractor confident in their craftsmanship. Ensuring your flashing is installed with code-compliant techniques can prevent more serious leaks and costly repairs down the line.