My only thought was that I wondered why you pulled up the sub-floor? Why
not just put tube over the sub-floor in a layer of mortar and set the tiles
on top? Some drawbacks could be extra floor thickness and maybe you wanted
to add extra insulation below - I guess.

I'm going to do my whole house (I'm in the middle of a major renovation)
with a thin slab. I'm wondering what DYIs do? I want to minimize weight
and thickness.

Thanks R

Anyway
"Miffed One" wrote in message
...
YOU ARE RUNNING POTABLE WATER THROUGH THIS SYSTEM WITH NO CHECKVALVE?

I'm sorry, I misunderstood.

The answer to your question is "no".