"TP" wrote in message
.. .


wrote:
Polyisocyanurate board, eg 1" Atlas Energy-Shield roof insulation.

Nick



Thanks for the replies. I was going with my gut and using a
polyiso board base, then the 1/2" gypcrete on top. I’m glad I
asked about the bubble stuff… can’t figure out why they
recommend it.
I see gypcrete isn’t sold to DIY’ers, so that is why I may go
with the sand mix.


Somewhere I may have a recipe for gypcrete. Email me and I'll send it to
you, if I can find it.
TP