Thanks for the info on the White Styrofoam. I never really ask if they could get different grades of it as far as PSI. I guess I just thought Styrofoam was Styrofoam? I will have ask about that. In the mean time I have one bundle of Dow 2" Square edge and one bundle of the 2" utility fit ordered. The guy at the lumber store said it may take 4 to 6 weeks to get, I am hoping to have it by the end of the month???