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Old 10-07-2010, 05:55 PM   #1
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Bathroom vent thru the roof


I would like to vent my bathroom fan thru the roof, it's a normal 4" duct. How involved is this procedure? Is there a good chance of it leaking if not done perfectly?

What would a roofer charge for cutting the hole and sealing the vent (I would do all the ductwork inside myself)?

I'm trying to weigh my options here, the roof is pretty high

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Old 10-07-2010, 07:56 PM   #2
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Bathroom vent thru the roof


Yes there is a good chance of it leaking if it is not properly installed and flashed. You can probably do this yourself if you are armed with necessary information to do it right.

Roofers typically provide free estimates on site. I doubt many would do so over the phone or online.

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Old 10-07-2010, 08:37 PM   #3
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Bathroom vent thru the roof


If it is a shingle roof I would charge my service call charge
(min $175),as many others probably would.A flat or low-slope roof would take a little longer.I think most companies would give you a price on the phone for that.I definitely would be cheaper doing it yourself if you think you could handle it.http://video.google.com/videoplay?do...9255397426783# maybe this would help
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Old 10-07-2010, 08:58 PM   #4
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Bathroom vent thru the roof


If you follow that video, add a bead of caulking or roof tar alongside the hole on the bottom half, each side, leaving the bottom open to drain any wind-blown rain from the sides. Tim will have a lot of leaks from that one....

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Old 10-07-2010, 09:24 PM   #5
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Bathroom vent thru the roof


I didn't really watch the video,I just thought it would give you the basic idea.
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Old 10-08-2010, 12:16 AM   #6
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Bathroom vent thru the roof


what if the bathroom is on the 1st floor? where does it usually vent to?
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Old 10-08-2010, 08:40 AM   #7
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Bathroom vent thru the roof


Bathroom exhaust fans can vent through walls or the roof or soffits, soffit venting is not recommended if your attic is vented through the soffit as the humid air from the bathroom could enter the attic through the soffit vents.
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Old 10-08-2010, 03:59 PM   #8
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Bathroom vent thru the roof


Quote:
Originally Posted by johnk View Post
If it is a shingle roof I would charge my service call charge
(min $175),as many others probably would.A flat or low-slope roof would take a little longer.I think most companies would give you a price on the phone for that.I definitely would be cheaper doing it yourself if you think you could handle it.http://video.google.com/videoplay?do...9255397426783# maybe this would help
Yes, it's a shingle roof.

You mentioned $175, for that price I would probably rather just pay a professional, both for the possiblity of my work leaking and the danger factor.

My roof is pretty steep and it is a normal shingle roof with one layer of shingles and plywood decking.

Out of curiosity, why would a low slope roof take longer?

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