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Old 07-24-2010, 12:36 PM   #1
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venting from mobile home through new metal roof


I want to put a metal roof onto my existing mobile home roof. My gas furance vent is not tall enough to go through the new metal roof. I have been told that a mobile home gas furnace vent has both the intake and out-take in the same design; a pipe within a pipe, that is why my pipe is 12 inches in diameter. I believe it is this type of exhaust & intake system.

I have also been told that I only need to bring the exhaust pipe through the new metal roof and that the intake pipe can draw its air from inside the roof. I have end vents on both sides of my mobile home allowing it to draw enough air. My question is; is this feasible and is this safe. I would not want to have it catch fire.

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Old 07-25-2010, 11:09 PM   #2
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venting from mobile home through new metal roof


I don't know about mobile home exhaust vents. But if you're correct (pipe-within-a-pipe), then I would recommend you have both pipes thru the roof. Having a hidden (blind) intake doesn't seem smart from a maintenance or accessiblility standpoint.

Also, I think mobile homes can only have 1 layer of roofing. So plan on a tear-off. I've seen old mobile homes with multiple layers, and the roof sags between the rafters with the extra weight. Looks terrible.


Note: I am not a roofer.

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Old 07-27-2010, 08:39 PM   #3
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venting from mobile home through new metal roof


You are right about making acessibility very difficult. I was trying to cut the size of the vent down going through the new roof from 10 or 12 inches to either 4 or 6 inches.

The new roof will be built as a truss, and I am planning to use it to help hold the ceiling in place. I also have 2x6 walls to support the weight. Thanks for your thoughts. It helps.
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Old 04-30-2015, 01:23 PM   #4
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venting from mobile home through new metal roof


Trailer roofs are not like stick built homes and can only have one layer
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Old 04-30-2015, 01:24 PM   #5
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venting from mobile home through new metal roof


I hope you weren't to late in telling him that. I'm sure its a 10 year project...
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Old 04-30-2015, 01:25 PM   #6
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venting from mobile home through new metal roof


Also, do not rely on attic space for air going to the burner.I have found so many trailers that have plugged up roof vents I could not count them on one hand.
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Old 04-30-2015, 01:30 PM   #7
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venting from mobile home through new metal roof


So 6 in total?
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Old 04-30-2015, 05:23 PM   #8
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venting from mobile home through new metal roof


Quote:
Originally Posted by 1985gt View Post
I hope you weren't to late in telling him that. I'm sure its a 10 year project...

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Old 05-01-2015, 08:53 AM   #9
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