i would like to build a workshop/garage in my backyard. I have a ~16 x 24' concrete slab that was poured as a basketball goal many years back by the previous owner. I have 2 options build my building on a skid and just level the blocks or somehow utilize the concrete slab and anchor the building to it. Question is how do I know if the slab will hold the weight and how can i utilize the slab w/out having to jackhammer it out and pour another slab. Any advice would be great!