Abstract: An assemblable temporary wall unit construction for industrial buildings wherein horizontally spaced vertical H-beam column members receive, a plurality of preformed stackable reinforced concrete panels positionable between and bridging the columns, the spacing between said columns being such that the panels can be inserted horizontally by positioning one end of the panel adjacent one of said beam columns, aligning the panel and shifting said panel horizontally to bridge the spaced column beams and wedge-like metal filler members being insertable between the panels and column beams for rigidly holding and confining the panels with respect to the column beams.