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Below-Grade Basement Foundation Insulation Necessary?

mossman's Avatar

Join Date: Mar 2009
Posts: 3,309

03-30-14, 10:44 AM   #1  
Below-Grade Basement Foundation Insulation Necessary?

I have a finished basement, the majority of which is more than 3/4 below grade. The builder installed 4-foot foil-faced batts all around the perimeter of the concrete foundation wall, some of which have been removed prior to me buying the house. My question is, do these batts serve any purpose for the below-grade portions of the foundation? I don't plan on removing all of them, but there is one 8 foot section in particular that is barely hanging on and it is in the way of a project I am doing. This particular section is all below grade and is adjacent to my concrete porch, so it seems even more unnecessary.

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Bud9051's Avatar

Join Date: Oct 2008
Posts: 9,764

03-30-14, 12:03 PM   #2  
I don't like fiberglass directly against the concrete, but the exposed concrete and first 2' below grade should be insulated. An 8" concrete wall is less than r-1.


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