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gone_fishing 11-16-2008 04:47 PM

Insulation in I correct?
Quick background...I live in a split level home. In January I will start a project in which I will gut the garage (living space above and adjacent). Once gutted I am sectioning off the back 1/3 and adding a home office. My place was to add R19 on the exterior wall, frame along the cinderblock wall and add R13 to all interior walls and R30 to the ceiling. I read that unfaced with a 6 mil vapor barrier is more effective. Am I correct on my plan?

Oh yeah, my home is outside of Philadelphia.

buletbob 11-16-2008 06:13 PM

sounds as tho you did your home work. Just make sure you have the R-19 In a 2x6 wall. Over lap your seems and tape them. BOB

gone_fishing 11-16-2008 06:38 PM

The exterior wall is I use R13 because of that?

ponch37300 11-16-2008 08:48 PM

2x4=R-13, When you try to fit to much insulation in a wall and compress it you actually are hurting the R value.

buletbob 11-17-2008 04:34 AM

gonefishing , Ponch is correct. even in the ceiling it will have an effect with R-30 in a 2x6 ceiling beam bay. in that case I install r-19 unfaced and then go over it in the other direction with the R-30 keeping the sides of the insulation tight. The Idea is to not expose the sides of the insulation or else it cuts down on its performance.

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