I am using adjustable jack posts to level some sagging in my house

Before you get into real trouble, lets review one of the basic laws of physics:
"For every action there is an equal and opposite reaction".
So what kind of footing do your jack posts bear against? Seems to me that the
first thing you do in any project like this is to prepare an adequate
foundation to carry the weight of the structure. If unsure, getting some xpert
help will ensure your success. Good luck.

Joe