A basement post is usually installed to counteract a sagging frame in a wood-frame house. Typically the posts are eight-foot adjustable devices that can be placed under a sagging beam or floor joist. They are made from metal and have an adjustable screw top that can be raised to fit the space between the floor and ceiling of the basement.
Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths.
My basement and house setup are identical, except rather than a steel I- beam, my main beam is comprised of three 2 x 12's sandwiched together and running the span. My house was built in 1983, and the run is supported by three vertical 4" steel posts, spaced about 6' apart, with the two on the outside being about 6' from the wall.
Column and beam construction is common in most homes. Beams can be as short as 3 feet or as long as 16 feet. Don't guess sizes. Consult with a professional engineer. Every week I get an email from a homeowner who wants to tear down a wall or she/he's contemplating some other structural modification
I'm redoing a basement after flooding and just found this little hack.. Apparently previous owner removed permanent support post for some reason and then at some point installed this temporary jack post and covered it up with dry-wall (Im guessing so house would pass inspection).
Support Beam Replacement and Repair Options. If you notice sagging or bouncy floors in your home, this indicates that the support beams in your basement or crawl space have become weak and can no longer support the weight of your floors above.