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Roof leak

Posted: Tue Oct 01, 2019 6:55 pm
by 204999
I'm in Winnipeg and during some very hard rain I noticed water leaking down the plumbing vent in the basement. Did some research and thought the issue might be a problem with the pipe flashing. A couple days later I went to the roof to check it out and found the flashing is not like anything i saw online. It appears the pipe is flush to the roof and some sort of inverse funnel flashing is installed and a short piece of pipe was at one time caulked to it.

Before going onto the roof I was ready to replace the flashing but I don't know how to do it with this type of pipe that is flush.

Do you think the water is getting in trough here ? And what is the best thing do do at this point

Re: Roof leak

Posted: Tue Oct 01, 2019 9:37 pm
by A. Spruce
I have never seen anything like this before, so I can't help.

Re: Roof leak

Posted: Wed Oct 02, 2019 8:32 am
by Shannon
ya these are supper common here. Its a lead flashing installed over the vent pipe. replacement is not as easy as just slipping it off and installing a new one since the new ones are plastic/rubber combos and designed for a pipe protruding through the roof. Yours is actually in pretty good shape, most times when the roof is reshingled these are bent up out of the way during shingle removal and then re used on new roof and after a few reshingles they get pretty beat up. yours is pretty good yet. I would use some roof tar to cover over the seams that are there ,looks like there could be a couple of spots where water was getting in and also down inside where the pipe edge is ,try sealing that. The small piece of pipe needs to be set back in and sealed as well. Finally carefully hammer the bottom lead edge flat, where it is sitting up a bit could allow a driving rain in.

If you decide to replace this it will involve getting in the attic and cutting the vent stack off about 12' lower and splicing in a new piece that sticks up through the roof about 12"-24". then installing a pipe boot over it and getting the boot under the surrounding shingles properly.