Mat Foundationss

[wirelesstom]

I have a 10'x18.5' floating slab foundation w/minimal loading (12,600 lbs of equipment in various cabinets). The slab is 6" thick w/#4 placed both ways at 12" O.C.. The slab is placed on compacted crushed stone.

The loading equates to 185-lbs/SF and the soil pressure is approx 1000lbs/SF. Should I worry about placing footings too or is the floating slab sufficeint?

The grade is level and not sloped. I am in the Northeast (NJ) however....

 

[J1D]

Depending on how concentrate your equipment loads are. If there is no big point load, the slab-on-grade is fine. Otherwise, you'll check the bending on the slab to determine footing or not. 6" slab with the reinf at middle height can resist some bending moment as well.