Abstract: A prefabricated transportable building module comprising a metal floor frame having a reinforced concrete floor provided within the perimeter thereof, four upstanding vertical posts secured at each corner of the floor structure and a roof structure including a transverse beam extending between and secured to the pair of vertical columns at each end of the building module and further including a plurality of spaced-apart and parallel open web trusses extending between and secured at each end thereof to the pair of transverse beams.