A jack for forcing adjoining boards or sheathing into close proximity or contact with one another and holding them in such a position while they are fastened to supporting joists or rafters. The device consists of a housing that is adapted to engage the joist or rafter. A slot is formed lengthwise in the housing and adjoins a side of the joist or rafter. A wedge is positioned in the slot so as to wedge itself between the housing and the supporting joist or rafter and hold the tool in a fixed position relative to the supporting joist or rafter. A lever is pivotally attached to the housing and has an attached pusher to engage the edge of a board or sheathing and move it into proximity or contact with an adjoining board that has been already affixed to the joist or rafter. A simple wedge or inclined plane minimizes the number of moving parts in the invention and produces a wedging force proportional to the force being used to move the board in contact with an adjoining board. A spring holds the wedge in the slot.
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