The most common leak on a Georgia roof
Plumbing vent boots fail before almost anything else on a shingle roof. The rubber collar sits in full sun, bakes for years, dries out and splits — and once it splits, water runs straight down the outside of the pipe into the attic. Shingles can have a decade of life left while the boot is finished.
That is exactly what we found here. The old boot's collar had cracked and hardened, and someone had tried to keep it alive with a heavy smear of sealant around the base and the pipe. The sealant had shrunk and pulled away in places, so the only thing standing between the attic and the next rain was a failing bead of caulk.
Why caulking a bad boot never works
Sealant is a maintenance product with a short life on an exposed, sun-facing roof detail. It also traps water: once it lifts on one edge, rain gets underneath and has nowhere to drain. Every time we cut out a caulk-repaired boot, the decking around the penetration is darker and softer than the deck a foot away.
The fix is replacement, not more sealant.
What we did
- Removed the old boot. Shingles around the penetration were carefully lifted, the sealant and old boot were cut away, and the deck around the pipe was checked for soft spots.
- New boot installed. A new pipe boot with a proper flange was set on the deck and fastened, sized to the vent pipe so the collar seats tight without stretching.
- Fresh flashing and shingle lap. Shingles were laid back over the flange in the correct order so water runs over the flashing, not into it — the shingle courses do the waterproofing and the boot does the sealing.
- Sealed and finished. The collar was sealed at the pipe, the surrounding courses were re-secured, and the area was cleaned off.
The result
A clean, flat penetration with no sealant blob, no split rubber and no exposed fastener heads. In the finished photo the boot sits tight to the shingles and the pipe, which is exactly how it should look and rarely does on a roof that has been patched.
Worth checking on your own roof
If your home is more than ten years old and still has its original boots, they are near the end of their service life. Replacing them is inexpensive compared with drywall, insulation and framing repairs after a slow leak. When we are on a roof for any reason, we check every penetration — boots, vents, and the roof-to-wall flashing — and tell you what has life left and what does not.
Other details worth having inspected at the same time:
- Ridge and off-ridge vent sealant
- Step flashing where the roof meets a wall or chimney
- Exposed nail heads on ridge caps and hips
- Gutter overflow that keeps a fascia line wet
Book a free roof inspection
Small roof repairs done on time are the cheapest work we do. Get in touch and we will inspect your roof, send you photos of anything we find, and give you a straight recommendation. More before-and-after write-ups are on our projects page.
Project photos
