Originally Posted by
ThePenIsMightier
So, you're still going to have to throw sand or gravel in there and then pour a concrete slab, correct? And it looks like the mono-foamed together chunks of styrofoam are going to essentially be the concrete forms?
I guess there also won't be rebar as basement floors don't usually have that.
This will certainly keep the plumbing safe from freezing, but it seems weird and that's probably only because I've never seen a house built this way. I worry that your concrete will be extra susceptible to cracking but I bet it actually won't because your house probably isn't going to settle a nanometer because it's on so many piles and if your house isn't settling and the slab is resting horizontally against styrofoam then you might never get cracks.
It's pretty neat!
Edit: since you just posted while I did.
That looks to me like your main inlet runs through a sleeve that has heat trace cable in it! That's extra extra freeze protection.