I have a gas-fired unit heater in my garage 30K Btu with a 3" B-vent or double walled stack through the roof. 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 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?