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Old 01-22-2007, 09:27 PM   #1
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Insulation


I am building a new home and the local building codes require that I have at least R-18 in the exterior walls. What I looking for is advice on the best materials to use and also the lowest cost. Thanks for any and all help!!!

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Old 01-22-2007, 09:51 PM   #2
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Insulation


Best AND lowest cost? Rarely do they happen at the same time.

If you want cheap and have wood frame, use 2x6 studs for the exterior and use fiberglass between the studs. The R19 insulation coupled with the uninsulated studs should give you an R18 or so wall if they are 16" or 24" on center. If you have 6" steel studs and fiberglass you will not meet a true R19 because of the heat loss through the steel.

Your other option for wood frame would be 2x4s, fiberglass and some sort of extruded polystyene insulation sheeting.

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Old 01-23-2007, 07:17 AM   #3
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Insulation


Blown cellulose is the solution, but you will have to have 6 inch walls...to get there with 4 inch walls and fiberglass, you will have to have a an inch of EPS and vapor barrier. You should be able to find a cellulose insulation installer that you can talk to. I just bought the system to add to our business...great stuff.
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Old 01-23-2007, 06:06 PM   #4
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FWIW:

THis Old House Mag. Had a small section covering the different forms/kinds of insulation. Brief descriptions, R-values, Pros and cons, etc....etc...
...If that helps you.
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Old 01-23-2007, 06:12 PM   #5
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Insulation


Thanks everyone for your information. After a lot of internet time, reading and a call to my local inspector I will be going with 2x6 walls and R-19 fiberglass. Its the most cost effective and will pass inspection the easiest, per the inspector. They have the last word so I guess I'll go with him. Again thanks to all! Bob
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