Why Do Roofs Leak Around Chimneys and Skylights?

When water appears around a chimney or skylight, many homeowners blame the shingles. But
penetrations are complex transition points where several materials must work together to
direct water safely down the roof.

Chimney leak causes
Step flashing along sidewalls, apron flashing at the lower side, counterflashing, and
appropriate upper details must be correctly integrated. Cracked masonry, deteriorated mortar,
or a missing chimney cricket on a large uphill chimney can also contribute.

Skylight leak causes
A skylight may leak because of damaged or improperly integrated flashing, aging seals,
condensation, or issues in the surrounding roofing. The source matters because replacing
shingles alone might not solve a defective skylight seal.

Why water stains can mislead
Water sometimes travels along framing or underlayment before appearing indoors. The visible
stain may be several feet from the entry point. A thorough diagnosis checks roof details and
interior moisture patterns.

Why caulk is not a permanent plan
Roof cement and sealants have legitimate uses when approved by manufacturers, but a bead of
caulk cannot replace a complete flashing assembly. Repeated surface patches can also conceal
the original problem.

What should you do?
Photograph when and where the leak occurs, avoid unsafe roof access, and schedule an
inspection. Reliant Roofing evaluates roofing details so homeowners can choose targeted
repairs when possible and more extensive work when necessary.

Reliant Roofing | Finally, a contractor you can rely on.