Are steel spreader bars that are attached to steel frames for shipping O.K. to use in installing a frame plumb and square?
No. The steel spreader bars’ sole purpose is to prevent damage while a welded frame is in transit. The spreader bars are not cut to the exact frame opening width, so the frame cannot be set ‘plumb and square’ using the spreader bar. Spreader bars should be removed prior to installation of the frame.