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Old 10-30-2015, 08:14 PM   #1
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Cold climate vs. plumbing in outside walls

I am beginning to plan room layouts for a house in Northern Minnesota (-25 deg F. or colder in winter) and need some guidance on pipe runs in outside walls.

Must all water appliances against an outside wall be plumbed directly to the floor or ceiling without running in an outside wall?
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Old 10-30-2015, 08:56 PM   #2
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In a room like the laundry room or a bathroom, if you need pipes in an exterior wall you can build a double wall, the outside one full of insulation and the inside one open for pipes, each framed with 2x4's.

If it's a something-and-a-half storey building, watch for pipes in walls where the other side is in a cold attic. Watch also for pipes in the floor between a garage and a living space above.
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Old 10-30-2015, 10:28 PM   #3
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Drywall is such a poor insulator, as long as the bare pipe is next to the drywall with the insulation on the opposite side, without exception, freezing isn't a problem as long as the structure is heated.
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Old 10-30-2015, 10:56 PM   #4
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You will need to double any walls you plan to run plumbing in to prevent freezing on an outside wall. I would strongly suggest that you use interior walls for all plumbing considering the extreme cold you have. So plan accordingly.
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