THE POURED FLOOR IN MY GARAGE HAS SHRUNK ABOUT 1/4 IN FROM THE POURED WALLS SHOULD I USE A SPEICAL CALKING TO FILL THE VOID?
Use a self-leveling urethane caulking to fill the cracks. Fill the cracks up with sand to within 3/8" below floor level. This will help save on caulking. This caulking will flow into the cracks and level itself. The sand also acts as a bond breaker. Caulking should only be bonded on two opposing sides to allow it to stretch properly.