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Old 02-20-2011, 10:36 AM   #1
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Insulating an existing finished basement


Hello Everybody,
I am currently looking to turn my partially finished basement into a usable everyday area. The basement currently has furring strips and then drywall over the CMU block wall...NO insulation. The finishing job on the drywall is pretty good so I would hate to rip out the sheetrock and have to frame and insulate. I have a very dry basement. Does anybody have any suggestions for adding insulation without removing sheetrock? Could I possibly blow in insulation by removing base molding and blowing through the gaps between furring strips? Thanks so much.

Jason

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Old 02-20-2011, 04:06 PM   #2
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Insulating an existing finished basement


As best as I can gather, blown in cellulose or fiberglass are not the best choices for your app. Sorry to tell you, but if you are going to insulate, nuke the drywall and install either rigid foam on the wall, rock wool between the studs, or both. Check on buildingscience.com

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Old 02-20-2011, 08:53 PM   #3
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Insulating an existing finished basement


One option may be spray foam.

Check out:

Tiger Foam™ 600 bd. ft. Kit - SR here

http://www.tigerfoam.com/products.php

This will be pretty pricey in comparison to other methods. When it comes to basements, you can pretty much stick with XPS foam and spray polyurethane foam.
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Old 02-21-2011, 09:28 AM   #4
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Insulating an existing finished basement


Thanks for the responses guys. I will most likely rip out the sheetrock and insulate with foam board.
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Old 02-21-2011, 09:33 AM   #5
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Insulating an existing finished basement


Quote:
Originally Posted by jman0505 View Post
Thanks for the responses guys. I will most likely rip out the sheetrock and insulate with foam board.
What about your outlets and switches?

The most common method of finishing basements is to frame a 2x4 wall set 1" away from the foundation.
This method makes insulation, electrical and drywall much much easier and a better bang for your buck.
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Old 02-21-2011, 12:32 PM   #6
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Insulating an existing finished basement


1" rigid foam sandwich. Just another alternative
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Old 02-21-2011, 07:01 PM   #7
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Insulating an existing finished basement


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Originally Posted by algored2deth View Post
you can pretty much stick with XPS foam and spray polyurethane foam.
I used to think the same thing, but after a lot of digging I am finding that EPS actually works a bit better than XPS. EPS is being used sub-grade extensively. So, either one, in a basement, should work fine. EPS is cheaper. (EPS is "white board", for those not into acronyms.
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Old 02-22-2011, 11:10 AM   #8
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Insulating an existing finished basement


Here is a review of different foam materials.

http://www.finehomebuilding.com/item...hould-i-choose


Another link to read:

http://www.greenbuildingadvisor.com/...oam-insulation

I have seen some basement remodels done with EPS. From what the above link says, it appears to not be a good enough vapor barrier on its own. I have no direct experience with EPS so I cannot comment on it directly. It may work just fine.

dennis


Last edited by algored2deth; 02-22-2011 at 11:15 AM. Reason: added link
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