You need to find out why the shifting is happening before you fix something.
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The previous owner of the house I own replaced the main beam. The beam is
supported by 4-5 metal supports that appear to be adjustable. The floor in
the main level of the house slopes upwards towards where the beam, by as
much as an inch or two. I'm thinking that I can lower the main beam by an
inch or so and level the floor. Does this sound feasible? Is this a very
bad thing to do, or might I be sucessfull in leveling the floor without
hurting anything?