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Old 08-03-2015, 06:20 PM   #1
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Insulation in basement


I am finishing my basement, and I have a question on insulation. Our choice of flooring is a acid stained concrete.

Am I incorrect in thinking that the insulation in the walls is basically pointless if you have the entire floor bare concrete? We are on a tight budget, and it is a starter home so we don't want to put a ton of money into it.
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Old 08-03-2015, 09:04 PM   #2
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Wall insulation is usually a good idea...depends on location; http://www.google.com/url?sa=t&rct=j...7c2C4A&cad=rja

Gary
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Old 08-03-2015, 09:24 PM   #3
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I live in an area that shows r5-r9. Also, won't the concrete floor defeat the temperature element?
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Old 08-03-2015, 09:59 PM   #4
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Edit: the pdf that first opened isn't the one you posted

I don't live in the north, a different chart suggested r5-9 for where I live. My thought was more about the heat loss from the floor.there is much more surface area from the floor that the small part of the basement I am remodeling
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Old 08-04-2015, 06:35 PM   #5
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Where do you live?

Gary
PS; http://www.quadlock.com/technical_li...Insulation.pdf

http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja

http://www.google.com/url?sa=t&rct=j...hj_I6fU2ymaUSA

The building looses heat at the perimeter because 6' down the earth warms to soil about 10*F warmer than surface temps.
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Old 08-04-2015, 08:10 PM   #6
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Old 08-04-2015, 08:52 PM   #7
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May homes insulate the walls and not the floor.
As Gary said the walls are colder then the floor as the floor is further below ground, some of the basement wall is even above ground.
Moisture (Condensation) is also a concern.
WE use 1.5 or 2" xps glued to the concrete wall, tape the seams, then a 2x4 wall with R12 insulation. Do not poly the inside. Treated bottom plate on the wall of course.
For you if your walls are straight and flat you can use 1.5" xps. (R7) 2" would give you R10 - then use 1x3 (1x6 ripped in 1/2) strapping on top of it attached to wall with concrete screws. Then drywall on that.
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Old 08-07-2015, 06:58 AM   #8
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Not exact but I remember this. R value can be adjusted for how much the earth covers and what is exposed. You may save some there. Floor is not a factor. It is deepest part and well insulated by earth.
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