Expanding foundation foam - GIF

[nova_robotics]

Ok Much less than Concrete. Concrete is 300PSI for non air entrained concrete.

Oh definitely weaker than concrete. But (generally) much stronger than the soil it's sitting on. The foam is going to have 3-4x the compressive strength of the dirt that's under it. So it's still an extremely useful material.

[Toolmaker51]

https://www.aa.co.nz/travel/editoria...asser-toilets/

Then I parry or raise you with https://www.madonnainn.com/blog/2019...ly-competition
and another for the pot The Madonna Inn: more than just a potty stop | Mom Central

In comparison, worked for an immense [nearly 200k employees] multi-national corporation. Their restrooms were famous too, largest cockroaches imaginable. Having plant built atop a horse racing track might have something to do with it.