Quote:
Originally Posted by thevillages2013
I don’t know what the talk about 10” of foam is all about what I saw in attics in Ga was more like 3” but a complete coating of sheathing, rafters and gable walls
|
See OP post #32 rsmurano:
If you are responding to my thread, no, we didn’t cool the attic.
Our builder only used the spray foam that was over 10” thick on the attic roof. There are 2 kinds of this insulation: closed cell and open cell. We had friends that retrofitted their attics with the open cell spray foam at a cost of $8000 for a 2400 sq ft, and their attic in the middle of a GA summer was also 70 degrees. There is no magic to this. The other benefit to this in GA is your furnace lasts longer because they are located in the attic. A furnace running in a room at 70 degrees will last longer than a furnace running in an attic at 140 degrees
That's the source of 10 inch foam. You may have seen closed cell foam which has double the R value of open cell foam.
Over and out. This thread has passed the point of diminishing returns.