P-trap On In Exterior Wall Install To Prevent Freezing - Plumbing - DIY Home Improvement | DIYChatroom


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Old 02-27-2013, 02:24 PM   #1
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p-trap on in exterior wall install to prevent freezing


I am installing a laundry on the 2nd floor of my home. I have the easiest access to run the drain to the basement next to an existing vent for the bathroom below on the 1st floor.

I would like to install the p-trap in the wall for a clean look and gain a few more inches in the small space.

I live in Southeastern Michigan so it can get cold, but the walls have fiberglass insulation. Can I wrap the p-trap in more insulation or spray foam it? When I removed the drywall, yesterday, to expose the drainpipe it didnít seem cold because of the insulation.

I want to prevent freezing, there shouldn't be cold air running over the trap in the insulated wall.

Any help would be appreciated.
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Old 02-27-2013, 11:01 PM   #2
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p-trap on in exterior wall install to prevent freezing


You can insulate between the trap and the exterior, but don't insulate between the trap and the interior of the house. That way the trap will pick up the warmth of the house.

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Old 03-01-2013, 09:42 AM   #3
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p-trap on in exterior wall install to prevent freezing


To ensure no freezing can I put the trap in the basement before the line goes to the main waste line? Effectively have like a 15ft standpipe?

So like the orange pipe in the picture.
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Old 03-01-2013, 10:07 AM   #4
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p-trap on in exterior wall install to prevent freezing


To meet IRC and UPC codes the trap must be as close as possible to the fixture. I think being that far of drop to the trap the velocity of the water may siphon it.

Last edited by OpieGoneBad; 03-01-2013 at 10:15 AM.
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