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Old 03-19-2014, 08:08 AM   #1
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EPS vs XPS


Hi All,

Is there a preference for one foam board versus the other. There is about a $10 difference (EPS is cheaper). I am planning on using 1.5" x 4' x 8' boards in my basement.

I have read that there are marginally performance differences.

I need 40 boards - is the extra $400 worth it?

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Old 03-19-2014, 10:33 AM   #2
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EPS vs XPS


There is a difference in the insulating value.

XPS is a much better insulator and you may be able use thinner sheets for the same insulation value if you go by the fictitious and theoretical R-value concept promoted and miss-used by the fiberglass industry. - Decreasing the thickness can make some finishing details much easier.

In a basement, the R-value might may not be that critical since you are only trying to insulate from the 55F soil for your area in comparison the bitter cold above grade.

EPS does a good job of making coffee cups and trays for meat cuts in a super market.

Dick

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Old 03-19-2014, 03:18 PM   #3
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EPS vs XPS


Quote:
Originally Posted by concretemasonry View Post
There is a difference in the insulating value.

XPS is a much better insulator and you may be able use thinner sheets for the same insulation value if you go by the fictitious and theoretical R-value concept promoted and miss-used by the fiberglass industry. - Decreasing the thickness can make some finishing details much easier.

In a basement, the R-value might may not be that critical since you are only trying to insulate from the 55F soil for your area in comparison the bitter cold above grade.

EPS does a good job of making coffee cups and trays for meat cuts in a super market.

Dick
thanx - i guess i am going with XPS
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Old 03-19-2014, 03:32 PM   #4
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EPS vs XPS


+1 to Concretemasonry's feedback.

XPS is the way to go in terms of basement walls.
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Old 03-20-2014, 12:43 AM   #5
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EPS vs XPS


Or use both (saving $$$) so long as the XPS is above grade and below to the "freeze line" for your location as in fig.40, also read pages 55-58? here; http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja

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