I have a gas-fired unit heater in my garage/Workshop, 30K Btu with a 3″ B-vent or double walled stack. There is water coming in looks like around the outside of the vent pipe when we get a heavy blowing rain. It amounts to a few drops on the floor enough to just cover the bottom of a five gal. Bucket.
On the roof, the vent pipe is not sealed to the roof flashing but the storm ring is sealed with what looks like gutter sealant. Should the vent pipe be sealed to the roof flash as well? I’ve received two options on this from two different contractors, one says yes it should and the other said no, “there should be movement because of the roof”.
Any ideas?
Paul
Replies
Paul
You might want to ask this over at Breaktime, they have some real good people on there.
My B-vent is installed on a shingle roof.
The flashing goes under the shingle above and above the shingle below.
Caulked it with a good coat of Lexel above and below.
Roof tarred it around where the flashing is exposed.
Lexel around the storm collar.
Never had it leak.
Jeff
Why wait... They drift in and out of here on occasion..
What kind of roof? Pitch?
What kind of stack cap?
How wide of flange on the storm colar?
Is the storm collar all the way down to the roof jack?
What's the rise on the roof jack? Is it installed upside down?
Is it the right jack for the pitch of the roof?
Can you tell if there is any water coming in on the inside of the stack?
Can you see the inside of the roof jack from the underside? (looking up the stack from inside the attic) Any rust or corrosion on the stack or roof jack? How much daylight can you see? Has it always leaked from day one?
You can seal the stack to the jack as a plan "B" but wait there's more. You may have other problems that need addressing.
Who ever invented work didn't know how to fish....
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