Dr Joe & CALNNC,
You can see why I liked the acoustical ceiling tile so much now, it was solid with some give to it, does an incredible job, unfortunately it is not cheap any more. I got mine free when Westinghouse left East Pittsburgh years ago, it was finally falling apart after 30 years, so I discarded it. I am going to look at Home Depot for the PolyPro EPS Insolation, if CAL had good luck with it, I may try it. Cal can you drill thru this Poly Pro EPS Insolation without it totally degrading? DR Joe I can't go the squishy backing route for what I need to accomplish engineering wise, my 2nd and 3rd levels need to sit on 2x4 type Trestling, the squishy stuff will not work. Hoping the PolyPro EPS Insolation will be firm enough to do the job.
Thanks much guys for the recommendations
PCRR/Dave