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Old 11-29-2007, 07:57 AM   #1
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Removal of Vent Pipe


We have removed our gas and there is a couple of gas vents where we had some gas appliance and heating and I am taking those out. The roof is Shingles and it is going to have about a 4" circle hole. What is the best way to take care of the hole. I thought maybe cut a piece of metal sheating and cove them up. But is there a better way. It is by the way a 4 x12 pitch roof and trusses if that helps plywood under shingles.

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Old 11-29-2007, 11:30 AM   #2
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Removal of Vent Pipe


Are you reroofing your house?

If not, what is the harm in the pipe? I would leave it if you are not putting new shingles on. Otherwise, best way would be to cut the extisting sheathing from truss to truss and add a new piece. We have covered smaller holes with flashing, but 4" is large considering a 4/12 pitch will be supporting more weight in snow and water sits on a lower pitch for longer amount of time.

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Old 11-29-2007, 11:51 AM   #3
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Removal of Vent Pipe


This one has a leak around it that is the reason
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Old 11-29-2007, 12:19 PM   #4
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Removal of Vent Pipe


Do you have shingles to patch with to exactly match your existing shingles? If so, you can remove the existing shingles back to past the roof trusses on either side and patch the roof sheathing, roofing felt and shingles.
If not, why don't you just seal around the pipes with black plastic roofing cement until you're ready to re-roof with all new shingles that do match.
That cement is extremely sticky and can be applied in the rain to seal leaks. Wear old clothes, rubber gloves and use a throw-away paint paddle to spread the cement with. You WILL get it on things that you don't want to. LOL
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Old 11-29-2007, 06:11 PM   #5
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Removal of Vent Pipe


Don't use any sheet metal for a patch. Besides the lack of structural support and the future possibility of someone stepping on it some time down the road and collapsing it and/or breaking their ankle, their would be a large sheet metal surface for condensation to collect on and drip into the residence.

Do it with equal thickness plywood or plank boards, which ever you have on it currently, and go from rafter to rafter with the patch. Also, use at least a 2 foot X 2 foot piece minimum for structural stability.

What is that black stuff Mike was talking about? I have not used that on any roof since my old hot tar roofing days.

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Old 12-01-2007, 11:35 PM   #6
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Removal of Vent Pipe


by all means cut in the plywood joist to joist,although wit adequate insulation /ventilation saying that large sheet metal srface ill drip water into the residence is overkill

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