Need support? Just add jack posts, right? No, it’s not that simple. It’s one thing to use it to take a squeak out of a floor perhaps, and quite another to support the weight of the load above.
Jack posts go by different names including tele-posts, lally column and adjustable steel posts / columns. The term “jack” refers to the jack screw used to adjust the height of the post.
Anytime you are dealing with a support post, there a few things you need to keep in mind. They need to be installed properly, as well as mechanically fastened at their top & bottom plates. If under a wood beam, the top plate on the jack post should be as wide as the beam (see left picture). The post itself should be plumb and centered on the beam (see centre picture). The beam and support posts should be sufficient to carry the desired load above. If the beam does not rest on a foundation wall (or in a beam pocket) there should be jack posts on each end of the beam to support it, not cantilevered (see right picture).
Not sure about the jack posts in your house? Thinking of adding some support? Get it inspected!