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Old 05-08-2015, 12:51 AM   #1
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Freeze protection for drain and cold water line...


Up here in Canada, Winters can get to -20 C (-40 with the windchill) for weeks at a stretch.

Existing framed wall is about five inches thick, with thin vinyl siding on the outside.



As you can see, the big black drain looks to run right adjacent to the exterior wall sheathing! So, very little between it and that cold winter wind.
Also the main cold water line into the building is quite nearby (that white PEX just to the left of to it.)

The thing is, that "just adjacent to that wall" I am going to build a foot thick double stud wall, filled with ROXUL, with double layers of sheetrock either side. Effectively creating a soundproof and air-tight SEAL for noise reduction - BUT also creating the side effect of preventing heat from the interior space of the room from reaching those pipe(s)!!

So, my concern will be preventing them from getting frozen in the winter.
I do plan to have a small access panel of some sort to allow access to the water shutoff valve & drain cleanout. But the panel too must be heavily insulated - basically this room will have a complete room-within-room for SOUNDPROOFING. (I need about 60 dB noise reduction, C-weighted!)

I'm thinking about some sort of "heating cable" installation in there, which would have thermostat control (to save energy) and also master switch that completely powers it down in the spring/summer/autumn.

Has anybody used this stuff: http://www.heatline.com/ ??

Or can recommend a more reasonable approach?
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Old 05-08-2015, 03:22 PM   #2
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Just around the pipe, remove fiber insulation and use can foam. Go through the area and make sure no draft will touch the pipes.
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Old 05-08-2015, 06:27 PM   #3
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The drain line would concern me. It is not filled with water most of time and heated water will tend help keep it clear.
The water line I think I would consider moving into the new wall closer to the heat.
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Old 05-08-2015, 08:17 PM   #4
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How far below grade are you?
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Old 05-08-2015, 08:34 PM   #5
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Quote:
Originally Posted by joed View Post
The drain line would concern me. It is not filled with water most of time and heated water will tend help keep it clear.
The water line I think I would consider moving into the new wall closer to the heat.
Should read the drain line would NOT concern me.
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Old 05-08-2015, 08:51 PM   #6
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Quote:
Originally Posted by Canarywood1 View Post
How far below grade are you?
the floor of that room is actually "above grade"... only the back wall of that room is buried:

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