Abstract: A modular building structure for converting an existing building interior to a convenience store or the like comprises a grid made up of a first set of parallel metal tubes supportable by levelers on an existing floor, and a second set of parallel metal tubes supported on, and extending orthogonally to, the tubes of the first set. Rectangular metal floor panels are supported on the grid. The panels have aprons along two opposite edges for resting on tubes of the first set, and the other two edges rest on tubes of the second set. The grid tubes are engaged with feet extending horizontally from upright, wall-panel supporting posts. The feet are identical and each is adapted to receive and support grid tubes of either set.

Abstract: In a metal wall comprising prefabricated modules joined together by double lap joints, an insulating strip, provided on each prefabricated module, is clamped between opposed transverse flanges which connect a laterally extending internal web of the joint to one of the faces of the module. The insulated strip extends from between the flanges into a space between the laterally extending internal webs of the joint, and thereby provides insulation between the opposite faces of the module, as well as between the module and its adjoining module. A screw fastener is used to secure the internal webs together, and a space between adjacent edges of faces of the adjoining modules is situated opposite the internal webs so that the fastener can be introduced through the space and concealed by a tamper-resistant caulking material introduced into the space.