As an apt bldg manager that has had numerous problems with
shower pans over the years....foam is not as reliable as mortar.
In fact in my home (we just bought) I'm having a problem with a fiberglass
tub that
that leaks and warbles, it was not set in mortar.
Not a pretty sight after the tub has been installed.
The mortar is thin...
I vote for mortar mix

Terry

"gntry" wrote in message
...
The manufacture suggests setting the new acrylic shower pan in a bed of
cement to add support I guess. My question I hope not that stupid, Is
something like a mortar mix better than cement mix? would I use a "stiff"
mix and just trowel it out so the pan "seat" itself? Anything better then
using cement? Expanding foam?