I've taken a look at "The Barrier" and it looks like an exceptionally good product and I would not hesitate for one second using under a slab that I only walk on. I am concerned with it under a slab that more than a few thousand pounds is rolling around on it, and a two post hoist with a 1 ton...
3-4 weeks from starting the construction of a new house(3300sq/ft) and attached shop(2800sq/ft) which consist of:
One(1) 30'x30' 9' ceiling - heated
One(1) 30'x30' 14' ceiling - heated
One(1) 15'x30' 14' ceiling - Unheated
One(1) an odd shaped room 550 sq/ft that is for tools, beer...