Posted By mtrentw on 11 Feb 2018 03:14 PM
I'd be curious about the space underneath the bridge. What is it's use, Garage? Parking? Wouldn't any type of foam likely require some sort of fir/ignition barrier?
Code requires a timed ignition barrier between the foam and conditioned space/ interior of the building. The slab is a good enough ignition barrier.
Foam insulation has been used on roofs and the exerior of walls without ignition barriers between the foam and exterior forever. That's a serious issue on walls for high-rise buildings with vented cladding (as in last year's apartment block fire in the UK), but not for 1-2 story houses, and certainly not for a drive-under parking space unless it's an enclosed garage.