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R13, R19, or what?


Libor's Avatar
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04-07-03, 01:12 PM   #1  
Libor
R13, R19, or what?

I will be tearing out plaster and insulating a couple of rooms this spring. The walls are exactly four inches thick because the studs in our 90 year-old house measure exactly 2 inches by 4 inches. Which means that R13 fiberglass insulation is a little too thin for that space, but R19 is a little too thick. Is there something in-between? At the big box places, I can only find those two R-values. I live in So. Maryland, by the way, so any R-value I can get is appreciated.

 
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04-07-03, 04:06 PM   #2  
I found that trying to compress fiberglass insulation made mounting drywall challenging. If you have to compress the insulation, you might consider using 5/8" dry wall to avoid problems with screws tearing out.

Others may be able to give more advice, but you might as well go with the thicker insulation.

Hope this helps.

 
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04-07-03, 04:25 PM   #3  
insulation

Could you glue 1" polystyrene in the studs and then use the R13. That would give you 1"+3 1/2". That would give you 4 1/2" as to the R19 at 6 1/4" To put the drywll over ED

 
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04-08-03, 05:28 PM   #4  
YankeeCraftmn
I would recommend that you use R-15 in your walls. That 1/2" of dead air space acts like insulation too. If you use polystyrene, that becomes you vapor barrier now.
Best bet, R-15 unfaced with 3-4 mill poly stapled to walls, tape all joints and around outlet boxes. Fool proof.
Good luck

 
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