Hi All, Im thinking about putting a storm celler under my Garage, The thing im not sure of is how AND how thick do I make the concrete floor over the celler, It will have to be thick enough to hold up a car.. See my point? Is there anyone that can halp?? celler would be about 12'x10'. :-[
Take a look at www.spancrete.com
They have a diagram of exactly what you want to do, having a car parked over a "basement" under the garage slab.
This type of application usually requires a local engineer to design it, then you will know exactly what is necessary. :)