Architectural shingles are a popular roofing choice because of their durability and aesthetic appeal, but valley leaks can sometimes occur due to the way water flows through these areas where two roof planes meet. Valleys are naturally vulnerable because they concentrate a lot of rainwater, and if the valley flashing or underlayment isn’t properly installed or has worn out, water can seep underneath the shingles. Poor nailing, damaged shingles, or missing flashing can also contribute to leaks. Simple checks at home include inspecting the valley for any loose, cracked, or missing shingles and looking for signs of water stains inside the attic or along interior walls near the roof’s valley areas. If you notice dark streaks, mold, or moisture, it’s a strong indicator of a leak. While checking, avoid walking frequently in the valleys to prevent damaging the roof further.
If you find symptoms or suspect a valley leak, it’s wise to reach out to a professional roofer experienced with architectural shingles for a thorough diagnosis. Ask the contractor how they plan to inspect the valley flashing and whether they will replace or repair the underlayment beneath the shingles since this layer is crucial for waterproofing. It’s also useful to inquire about the type of flashing they recommend and if it complies with the shingle manufacturer’s warranty requirements, as poor materials or workmanship can void warranties. A trustworthy roofer should explain how they’ll secure the shingles to prevent future leaks without compromising the roof’s structural integrity. Addressing valley leaks early protects your home from water damage, so don’t hesitate to seek expert help if your own safe checks raise concerns.