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Roofing · Replace before they leak

Pipe boots aging on a mid-life roof

Pipe boots fail before shingles do. Replacing them proactively at the fifteen-year mark is inexpensive and prevents the leak that damages the ceiling below.

Quick answerThe rubber collar on a plumbing vent boot dries out and cracks long before the shingles around it wear out. Once it splits, water runs down the pipe into the attic. Boots fail before shingles do, so replacing them proactively at about the fifteen-year mark is inexpensive and prevents the leak that damages the ceiling below. You can plan this yourself, no call needed.

A mid-life roof often has years of shingle life left and a set of boots that are already on borrowed time. Catching them early is one of the cheapest bits of roof maintenance there is.

This is most common in homes built roughly 1980 to 2000. The polybutylene and aluminum-wiring window, 150 amp panels, R-22 systems and first-cycle architectural shingle.

1Why boots fail first

  • Sun on rubber. The rubber collar faces the sky all day. UV dries it out and it cracks around the pipe.
  • Movement. Pipes expand and contract with temperature, working the seal loose.
  • Fasteners. Exposed nails holding the boot’s base can back out and leave holes.
  • Animals. Squirrels sometimes chew the rubber.

2How to check them

  1. Look from the groundUse binoculars. Look for cracked or split rubber, a gap around the pipe, or a collar that has slumped.
  2. Check the atticOn a rainy day look at the pipes where they pass through the roof deck. Staining on the deck or wet insulation around a pipe is a sign.
  3. Know the ageIf the roof is around fifteen years old and the boots are original, plan to replace them.
  4. Count themMost houses have more than one plumbing vent. Check every boot, not just the one you can see.
Roof and ladder safety

Replacing a boot means working on the roof. Only do it on a low-slope, single-storey roof in dry, mild weather. Never work at the roof edge alone. If you’re unsure, have a roofer do it.

3Fixing it

Do it yourself

  • Low, walkable roof and you’re comfortable up there
  • Lift the shingles above the old boot, remove it and slide the new one in so the upper shingles overlap its top edge
  • Seal exposed nail heads
  • A slip-on repair collar can extend the life of a boot whose base is still sound

Hire a pro

  • Steep or high roof
  • The deck around the pipe is soft
  • Shingles around the boot are brittle and crack when lifted
  • You’re having other roof work done anyway

Don’t just pile sealant around a cracked collar. It may slow a leak, but it fails quickly. Replace the boot or fit a proper repair collar.

4What drives the cost

Boots themselves are inexpensive. If you hire it out, the price depends on how many boots there are, roof pitch and height, and whether any decking or ceiling below was damaged. Doing all of them at once costs less than one at a time. See roofing cost.

5Questions

How long do pipe boots last?

Typically less than the shingles around them. Plan on replacing them around the fifteen-year mark, or sooner if you see cracking.

Can I just caulk the crack?

It’s a short-term patch. The rubber keeps aging. Replace the boot or fit a repair collar.

Should boots be replaced during a reroof?

Yes. Ask for new boots in writing. Reusing old ones is a common shortcut.

Written by Jaylan Jones. I Like To Exterior Services earns a referral fee when a call connects to a contractor. See our business-model disclosure.