Have you noticed water stains creeping across your ceiling after a heavy rain? Or maybe you’ve found damp spots near the bathroom vent? 

In many cases, the culprit is not a missing shingle but a small leak around the vent pipe on your roof. It might look harmless, but even a minor leak can lead to serious water damage over time. So, how can you fix a leaking roof vent pipe? 

Let’s go step-by-step.

What Causes A Vent Pipe Leak

Vent pipes help your plumbing system release gases safely out of your home. But over time, the materials around the pipe, like flashing or vent boots, can deteriorate due to sun exposure, age, or storm damage. Once cracks or gaps form, water finds an easy entry point during rain.

If left unchecked, that water can seep into your attic, damage insulation, and even cause mold growth. The good news? A vent pipe leak can usually be fixed with a few tools and a careful approach.

Identify The Leak Source

Start by inspecting your roof on a clear day. Look closely around the base of the vent pipe for cracked or dried-out rubber, corroded flashing, or loose shingles. Inside your attic, trace any visible water stains back to their highest point that’s often right where the leak begins.

Remove Damaged Materials

Once you’ve located the problem area, gently lift the shingles around the vent pipe using a putty knife or flat bar. Be careful not to tear the surrounding shingles. Then, remove the old flashing or vent boot and scrape away any leftover sealant or debris.

Install The New Boot Or Flashing

Slide a new vent boot or metal flashing over the vent pipe, tucking the top portion under the shingles above and letting the bottom overlap the ones below. This setup directs rainwater away from the pipe opening and prevents pooling.

Seal Everything In Place

Apply a thick bead of roofing sealant or cement along the underside of the shingles before pressing them back down. Once they’re set, use roofing nails to secure the flashing and seal the nail heads with more sealant. This step ensures a watertight finish that holds up against heavy rain.

Temporary Fix For Small Leaks

If the weather’s bad or you need a quick solution, you can apply roofing sealant and a small piece of flashing to cover the leak temporarily. Just remember, this is not a permanent solution; the boot or flashing should be replaced as soon as possible.

If you suspect a vent pipe leak or need help diagnosing roof-related HVAC issues, contact Service Wizard Heating and Air Conditioning. Our experts ensure your home stays comfortable, dry, and energy-efficient all year long.