Plumbing vent pipes on house roofs are covered with a metal square of flashing and sealed with silicone caulking.
How to seal reaeal pipe boot on roof.
And begging to caulk around where the boot will go on the roof.
The flashing of the vent pipes.
Vent pipes are roof penetrations so holes are created.
On the boots if you have metal roof jacks with rubber boot seals on top with many models the rubber seals can be popped off and replaced without removing the metal part and there are also slip over boots that can just nestle down over the existing damaged boot and overlap the top of the jack but contractor would have to look at it and see then go get parts so if using a contractor.
This is why they re installed with a rubber boot.
Place the new boot in the hole of the pipe and cut the boot on the line that touches the rim.
Why do vent pipes leak.
Even if the hole matches the size of the pipe perfectly there will still be gaps.
These gaps should be sealed.
Oatey retro master roof 4 in x 8 in aluminum vent and pipe flashing american metal products 4 in x 14 75 in aluminum vent and pipe flashing.
Find quality vent pipe flashing online or in store.
As mentioned there s a rubber boot that serves as a seal to prevent water from leaking in.
How to seal a plumbing vent pipe on the roof.