After having spray foam installed on Friday we've had the weekend to assess the results. We have had record heat in Atlanta over the last few days, seeing triple digits every day. The insulation has kept the temperatures down substantially in the attic. They have been contained to about the same outdoor temperature versus the 130-140 degree range without the insulation. On Saturday afternoon the attic temperature peaked at 102 degrees. This is quite a dramatic reduction in the amount of heat getting into the attic, but I would like it to be even less. I am working on some ideas to further reduce the heat gain in the attic. I will post them as they are implemented.
There is a noticeable odor when they first spray the foam. By the next day it had all but dissipated.