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Old 11-16-2008, 04:47 PM   #1
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Insulation in rennovation...am 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.
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Old 11-16-2008, 06:13 PM   #2
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Insulation in rennovation...am I correct?


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
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Old 11-16-2008, 06:38 PM   #3
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Insulation in rennovation...am I correct?


The exterior wall is 2x4...do I use R13 because of that?
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Old 11-16-2008, 08:48 PM   #4
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Insulation in rennovation...am I correct?


2x4=R-13, When you try to fit to much insulation in a wall and compress it you actually are hurting the R value.
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Old 11-17-2008, 04:34 AM   #5
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Insulation in rennovation...am I correct?


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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