XPS on uneven basement walls.

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TomK
Posts: 31
Joined: Fri Dec 22, 2017 3:09 pm

XPS on uneven basement walls.

Post by TomK » Sun Jun 30, 2019 9:20 am

Hey All,

If I encounter uneven basement walls, such as these:

https://drive.google.com/open?id=1amZXX ... rVlmdY-EMt

1) I'm thinking it's better to place the XPS against the concrete then set the 2x4's straight as in the image. However, that will leave a gap between the 2x4's and the XPS up to 1 inch in some places.

2) Framing right against the wall will leave an uneven wall later on, so I don't see that as an option.

I'm going with 1) to minimize the air space between the concrete and the XPS however need to ask should I bother to fill in the space between the 2x4's and the XPS with thin strips of wood or another material?

The reason, why I ask, is that blocking is installed midway to prevent the studs from a) warping and b) prevent the spread of fires.

If I have a 1" gap between the 2x4's and the XPS, it certainly defeats the second purpose, b), since there's now a 1" gap between the XPS and the 2x4's.

Wondering about your thoughts on this.

Thx,
TK

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Shannon
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Re: XPS on uneven basement walls.

Post by Shannon » Sun Jun 30, 2019 5:30 pm

When working with non straight walls it is pretty tough to have it ideal.

In most cases you are fine with things like you have in the diagram.
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TomK
Posts: 31
Joined: Fri Dec 22, 2017 3:09 pm

Re: XPS on uneven basement walls.

Post by TomK » Mon Jul 01, 2019 2:04 pm

Thanks Shannon. Appreciated!

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