Hydrostatic Pressure floor-on ground

(1)  Where groundwater levels may cause hydrostatic pressure beneath a floor-on-ground, the floor-on-ground shall be,

    (a)   a cast-in-place concrete slab, and               

(b) designed to resist such pressures

Article 9.16.3.2 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.