Plumbing vent stack leak (snow)
I have a plumbing vent stack that has a plastic/rubber ready-made
flashing/boot. It seems to be installed correctly (the flashing is
above the shingles on the downward slope and below the shingles on the
upward slope).
However, I get a leak only when snow melts. Rain is no problem.
I suspect snow/ice is damming at the vent and accumulating upward and
below the shingles. Is there a way to prevent this? Can I use a
shingle adhesive to seal the shingle to the flashing and prevent water
penetration below the shingle?
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