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Old 05-03-2018, 06:38 AM   #1
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Bathroom Vent Pipe - uninsulated or insulated?


I’ll be replacing my bathroom vent hose as the original owner decided to used this terrible plastic flexipipe. Duct tape around the connections.... yeah that kind of setup. Air never flowed well.

This is a first floor bathroom in MA and it is being vented out the side of the house with the run going in between the first and second floor.

My question is should I use rigid insulated pipe or can I used uninsulated rigid pipe? The run will be about 6-7 feet long with one turn.
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Old 05-03-2018, 03:15 PM   #2
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Re: Bathroom Vent Pipe - uninsulated or insulated?


Technically there is no water in the pipe, only air, so nothing should need insulation.
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Old 05-03-2018, 04:02 PM   #3
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Re: Bathroom Vent Pipe - uninsulated or insulated?


It has been my experience, the typical ceiling mount 50 -70 CFM bathroom fans do not do well, when venting them horizontally from the room, straight outside.
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Old 05-03-2018, 06:04 PM   #4
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Re: Bathroom Vent Pipe - uninsulated or insulated?


Sorry, I was thinking "vent", not fan exit.
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Old 07-06-2018, 01:48 PM   #5
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Re: Bathroom Vent Pipe - uninsulated or insulated?


Quote:
Originally Posted by Gregsoldtruck79 View Post
It has been my experience, the typical ceiling mount 50 -70 CFM bathroom fans do not do well, when venting them horizontally from the room, straight outside.
Can you elaborate on this a bit? Or suggest what you would recommend instead of venting horizontally?
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Old 07-06-2018, 02:21 PM   #6
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Re: Bathroom Vent Pipe - uninsulated or insulated?


I don't think you need to use insulated duct. The space between floors is going to be fairly close to room temp. I would pay more attention to sealing the duct well since it will be moist air(assuming there is a shower in there). Only think you may want to insulated is the last couple feet before it gets to the outdoors since that could see cold temps and cause condensation. Probably overkill though.
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Old 07-06-2018, 02:52 PM   #7
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Re: Bathroom Vent Pipe - uninsulated or insulated?


@Bret86844 has the right idea you have a short warm pipe but the last couple feet will be cold and that cold will effect the floor above and the ceiling below. So for 2 reasons wrap bat insulation around the last few feet.
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