A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
How to make floor jack lay flat.
Understand the limitations and types of floor jacks before ordering the lifts you need.
Steel floor jacks are sturdier and heavier than aluminum floor jacks.
Once the compound is dry make another sweep with your electric sander to shave down slight differences in the height of the subfloor and even out rough patches.
Perform your own automotive repairs at home or add a new floor jack to your pro mechanic shop.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Place the level on different areas of the floor and notice if it lays flat in all spots.
Hold your level over any areas of the floor that appear to be higher or lower than the surrounding surface.
Sand from one end of the room to the other pushing the sander along in a straight line and reversing your direction each time you reach the opposite wall.
The floor dimensions are about 13 by approx 5.
Question for you i have a jack and jill bathroom that has a pretty unlevel floor.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
Look for areas where the level doesn t lay flat to identify high and low spots.
Both aluminum and steel are used to make floor jacks.