Replacing Roof Flashing Vent

Plumbing vent pipes that extend through the roof come with metal flashing or rubber boot type flashing to seal the penetrations.

Replacing roof flashing vent. To replace flashing around the vent pipe first remove the shingles covering the flange at the back and sides. The collar and sleeve looks like the new construction version without the roof flange slides over the plumbing vent pipe and damaged boot flashing. Replacing a dry rotted vent pipe flashing since the rubber material that fits around the pipe is susceptible to breaking down from uv sun rays it is only a matter of years until you will need to replace the flashing. Pull or cut off any nails.

Pull the old flashing up over the vent pipe and scrape any old caulk and debris off the roof. On a typical re roofing job where you are replacing an old or underperforming roof it is wise to replace all flashing. Pry and lift off the flashing. A cap collar slides over the base assembly to completely enclose the vent pipe.

Roof flashing sometimes develops holes often from hailstorms. Figuring that the rubber collar on the new flashing may split before it s time to strip and replace the roof shingles another 20 years hopefully i first seal the vent pipe to the metal of existing flashing with protectowrap s form flash 2 flashing tape. Position a new vent pipe flashing over the vent push it down into place and nail where shingles will cover it. When you reach the vent pipe you then insert a vent pipe flashing and continue adding shingles around and above it as normal.

If you find a hole simply cut a patch from an extra piece of flashing and thoroughly clean and smooth the area around the hole. The home mender shows how to replace a broken pipe collar on a shingle roof. Click the links below to see inside dustin s toolbox ps roofers charge up to 2. Cover the screws with a waterproof substance such as a silicon seal.

Old flashing may begin to fail before the new roof s lifespan is over. Replace the shingles and cover the nail heads with roofing cement. They also make a boot flashing repair version. However there are limited circumstances where a roofer may decide to reuse flashing.