The $20 Roof Part That Often Leaks First
Cracked plumbing vent boots are a common roof leak. Learn the warning signs and how The Great House replaces pipe boots in Northern Virginia.
ROOFING
11/30/20263 min read
ASK MASON · ROOF
The $20 Roof Part That Often Leaks First: Pipe Boots
Mason shows how pipe boots crack, the signs of a leak, and how we replace them.
One of the most common roof leaks starts at a twenty-dollar part.
Watch Mason’s video, then read where it is, the warning signs, and how we fix it.
IN THIS GUIDE
01
What Mason Checks
The Boot Around Every Vent Pipe
VENT PIPE
Plumbing vents come up through the roof.
RUBBER COLLAR
Seals tight around the pipe.
UNDER THE SHINGLES
The flashing tucks under the row above.
Every plumbing vent pipe that comes through your roof has a boot around it.
It’s a metal flashing with a rubber collar that seals tight around the pipe, and tucks under the shingles above.
The sun beats on that rubber every day. Over time, it dries out and cracks.
Mason’s diagram: a new pipe boot vs. a sun-baked, cracked one
The roof can be fine, and still leak at one small collar.
02
Warning Signs
Signs a Pipe Boot Is Leaking
CEILING STAIN
A stain near a bathroom ceiling.
CRACKED BOOT
A cracked or split rubber collar.
ATTIC DRIPS
Drips in the attic after rain.
Rain runs down the pipe, right through the crack and into your attic.
It soaks the roof wood and the insulation, and shows up as a stain on the ceiling, often near a bathroom.
Check this today
Use binoculars to look at the rubber collars around the vent pipes. In the attic after rain, look for wet wood or drips along the pipes.
03
How We Fix It
A Quick Fix Now, or Ceiling Repairs Later
We remove the shingles around the pipe, install a new boot, tuck it under the shingles above, seal it properly, and check the wood underneath.
Caught early vs. caught late
Caught early, it’s a quick fix. Caught late, it’s ceiling and roof repairs.
In Northern Virginia
Northern Virginia’s hot summer sun is hard on rubber roof parts. In Fairfax County, a boot replacement doesn’t need a permit; replacing 256 square feet or more of roof plywood does. We fixed this on our Armistead St renovation in Alexandria.
Planning a bigger project?
Getting a new roof? We replace every pipe boot as part of the job. See prices and real projects on our roofing page.
The fix: a new boot tucked under the shingles
ASK MASON · ROOF
Want to know another problem?
SPOTTED ONE OF THESE SIGNS?
We’ll check it before it turns into a big repair
Free in-home visit from a Class A licensed team. We check the problem, your roof and your attic, then give you a clear written plan.
ABOUT THE AUTHOR
The Great House team
Written by the team at The Great House LLC, a Class A licensed builder and remodeler in McLean, VA (License #2705197237). We have renovated 30+ Northern Virginia homes since 2022.
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Our roofing service
See prices, real photos and how we work: our roofing page. Real projects: our project gallery.
Serving McLean, Vienna, Great Falls, Fairfax, all of Northern Virginia.