Insulation Touching Concrete In Basement - General DIY Discussions - DIY Chatroom Home Improvement Forum

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Old 02-22-2010, 12:12 AM   #1
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insulation touching concrete in basement

Im framing my walls in my basement, the exterior first.Im useing metal framing and i want to 2 1/2 studs to give me more sq footage.My question is if i do that and leave myself some space behind for clearance,then use 3 1/2 batt insulation it will touch the concrete,im thinking that will be a problem in the long run.



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Old 02-22-2010, 10:09 AM   #2
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You do not want the fiberglass insulation touching the basement walls
Ideally you want 1" of air space behind the insulation
Or use rigid foam boards up against the basement walls...then studs


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Old 02-22-2010, 01:49 PM   #3
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And by compressing the 3-1/2" insulation into the 2-1/2" cavity you would actually lose R-value....
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Old 02-22-2010, 02:13 PM   #4
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Just curious, why is it a problem if the insulation touches the basement floor?
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Old 02-22-2010, 10:37 PM   #5
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You might want to read this before you get started. I would NOT use fiberglass! You will just end up with mold!

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Old 02-23-2010, 12:25 AM   #6
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"use 3 1/2 batt insulation it will touch the concrete,im thinking that will be a problem in the long run." ----- correct:

No air space behind the insulation: Glass batt relies on the small air spaces to work properly. A bigger space allows air currents to form defeating the whole idea of still air. AND, fire-stopping is required every 10' horizontally and vertically, per safety code.

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