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Old 01-02-2019, 05:48 PM   #1
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XPS in basement around pipes


I am planning to finish my poured concrete basement with 2" XPS over the concrete, with a 2x4 framed wall in front with fiberglass insulation and drywall.

I have some plumbing attached to one wall, and although I know a continuous insulation layer would be ideal, I would really like to avoid moving them. Can I cut pieces to fit around the pipes, or would I end up with condensation issues? If I cut around, should I seal against the pipes with expanding foam? Or tape over a plastic vabor barrier?
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Old 01-02-2019, 08:41 PM   #2
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Re: XPS in basement around pipes


I am not a basement guy, but there is NO way I would move those drain lines...
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Old 01-03-2019, 08:04 PM   #3
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Re: XPS in basement around pipes


When I did my basement last year, most of my research leaned towards not using fiberglass batts over xps. A faced fiberglass creates a situation where moisture can get trapped between 2 vapor barriers. I did piece xps around drain lines and spray foam the remaining gaps. Also, tape the seams to prevent moisture getting through the seams of the xps and condensing on the concrete.

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Old 01-03-2019, 09:11 PM   #4
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Re: XPS in basement around pipes


Quote:
Originally Posted by cmwhitmoyer View Post
When I did my basement last year, most of my research leaned towards not using fiberglass batts over xps. A faced fiberglass creates a situation where moisture can get trapped between 2 vapor barriers. I did piece xps around drain lines and spray foam the remaining gaps. Also, tape the seams to prevent moisture getting through the seams of the xps and condensing on the concrete.

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I plan to tape or caulk the XPS seams, and use unfaced fiberglass, as I donít want to vapor barrier here. For my climate 2Ē XPS will be a sufficient vapor barrier. Good to hear you just sealed around drain lines. I assume no issues?
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