Engineered suspended garage slab

[perryh]

If you think about it, a car that weighs 2200 lbs + 4 adults at 200 lbs each and occupies a space of 10'x20' is only exerting an average load of 15 lbs/sq.ft. - less than a normal live load for a living space. The point loads at the wheel locations would be 750 lbs each which is why I use the thicker plywood and 4x's @ 12" o.c.

It makes for a really stiff floor - shear wall requirements are no more than for any other occupied space.

That must be a small car, what about a motorhome at 22,000 lbs or a truck.