Effect of adding cellulose insulation on top of existing R-19 fibergass batts
My builder has installed R-19 fiberglass insulation (with vapor barrior) in the attic of the 2000 square foot one-story house he is building for me in Maine. He now plans to add 13-14 inches of blown Green Fiber cellulose insulation on top of this. Cellulose insulation being as heavy as it is, my concern is that it will compress the fiberglass, diminishing its loft and hence diminishing its R-value. Does anyone have any data on the relationship between compression and loss of R-value with fiberglass insulation? Or on the question of how much such a layer of cellulose would compress the underlying fiberglass batts? If this could be known, the cellulose layer could be increased in depth to compensate for the R-value loss.
Posted Sun, 03/23/2014 - 11:14
Other Questions in General questions