Insulation, Radiant and Vapor Barriers - blown insulation thickness

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dan619fan
03-29-05, 03:22 PM
We are building a new home and we wanted to put in blown insulation. but we wor wondering how much r-value is in an inch of blown insulation.

Ed Imeduc
03-29-05, 03:32 PM
It all comes down to just what is the insulation you want to use. The R is marked on roll, pads, boards of foam. bags of blow in will say on the side just how many sq ft per bag for what R.


ED ;)
grover
03-29-05, 06:57 PM
There will be tables printed right on the bag that states specifically the R/inch. I believe it changes depending on the installation method too (blown vs spread by hand), but that will be marked too if it's a factor.

I jotted down "40sqft R-19 (6") or 25sqft R-38 (9")" for the $7 bags of cellulose last time I was at lowes, if that helps you ballpark it at all.

michiganguy
03-29-05, 08:05 PM
It makes a difference, too, whether your talking blown fiberglass or blown

cellulose. The cellulose has a higher R-value than the FG.