The picture below shows an old car jack on top of a wood post being used to support a main beam in the basement of a residential home. The jack and wood post were not joined together, making this “do-it-yourself” support subject to being knocked over. The steel plate between the jack and the beam was also not attached to the beam. If this home were located in an active seismic area, this support could eventual fail.
Permanent supports should be at least 3 1/2 inch diameter, one piece cement filled columns on proper footings. The top plates for the column should also be screwed to the beam. As some would have guessed, the owner of this home was an auto mechanic.
Photo taken by Dennis Robitaille of Able Home Inspection.