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Old 01-22-2012, 11:08 AM   #1
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2" XPS board


Hey guys I'm gonna start to insulate the basement walls next weekend and my question is what should I do about getting the 2" insulation behind my sewer pipes hung on the wall. I don't think I can fit it behind there, do I have any other options or should I just not worry about it and tuck up as close as I can. I only have about a half inch to work with back there.

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Old 01-22-2012, 11:23 AM   #2
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2" XPS board


Go buy some 1/2 foam board.

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Old 01-22-2012, 12:28 PM   #3
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Go buy some 1/2 foam board.
Ya think just do 1/2 " behind the pipe? Should be ok? Gonna finish basement over the next months
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Old 01-22-2012, 03:12 PM   #4
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How are the sewer pipes spaced?

Are they affixed to the wall, in the poured slab, etc?

If they are in the slab, 1/2 board is all you can get and if they are sewer lines (i.e. not supply lines) you should be fine.
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Old 01-22-2012, 03:36 PM   #5
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There hanging on the basement wall with metal banding. I live jut outside of buffalo by. It's not a slab house. Poured concrete foundation. You think the 1/2" board would be fine. Than I can just continue to use the 2" XPS board everywhere else
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Old 01-22-2012, 08:41 PM   #6
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What about leaving a 1/2" to 1" gap on each side of the pipe and using spray foam to fill the gap?

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Old 01-22-2012, 10:58 PM   #7
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That would work but I think folks are over-thinking it a bit. If it is a vertical sewer pipe, I would not worry too much about getting it perfectly insulated from the foundation wall. It should never freeze.
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Old 01-23-2012, 12:13 AM   #8
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That would work but I think folks are over-thinking it a bit. If it is a vertical sewer pipe, I would not worry too much about getting it perfectly insulated from the foundation wall. It should never freeze.
Yeah it runs horizontal, it's about a 15 ft run of 3" PVC pipe. I maybe loosen te metal banding and try to squeeze the 1/2 " board behind it that's All. Thanks everyone for the help. I like havin the 2nd opinion.

Mike
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Old 01-23-2012, 12:22 AM   #9
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Use a little foam compatible adhesive on them, to keep the air from the cold concrete wall:http://joneakes.com/jons-fixit-database/743

Gary

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