Go Back  DoItYourself.com Community Forums > Interior Improvement Center > Insulation, Radiant and Vapor Barriers
Reload this Page >

Below-Grade Basement Foundation Insulation Necessary?

Below-Grade Basement Foundation Insulation Necessary?

Old 03-30-14, 10:44 AM
Thread Starter
Join Date: Mar 2009
Location: Northern Virginia
Posts: 3,914
Received 27 Upvotes on 21 Posts
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.
Old 03-30-14, 12:03 PM
Join Date: Oct 2008
Location: New England
Posts: 9,460
Received 47 Upvotes on 43 Posts
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.


Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: