Concrete-Free Slab for Garage

With the greener building practices turning up around concrete-free slabs, I have not found anything around using the same practice for a detached garage.

To be clear (and if you’re not familiar), I’m referring to a general floor assembly of crushed/compacted rock, then foam, then poly, then staggered sheets of plywood subfloor.

The immediate concerns that come to mind are:
– the finish layer: what would you lay on top of the plywood to protect it from the elements? tile? epoxy?
– the compressive strength of the foam and plywood: would it hold up with a vehicle driving and parking on it?
– garage door transition: would you use the same one you’d use for any other door opening?

What do you think?

I don't think you can as wood won't meet non-combustible requirement unless you get expensive wood. At that point, might as well pay for the concrete.

A concrete-free slab can work fine for a detached garage if your soil drains well and you include good insulation, a vapor barrier, and a solid crushed-stone base. I’ve done similar builds and they’ve held up well as long as the edges are protected from frost. While sorting out my own projects, I also used https://emersonproservices.com/air-duct/ for indoor air quality stuff at home, and that freed up time and energy to focus on the build.