If your house is sagging or uneven due to sinking foundations then you can use a jack to raise the house back up to level.
How to level your house floor.
Place heavy duty floor jacks under the low spots.
Jacking can mean different things.
Place your level in several different spots as you did before to get a more accurate reading of the floor s overall slope.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
This type of floor leveling is diy friendly and costs approximately 1 50 per square foot when applied 1 8 inch thick.
Determine how far the middle of the house needs to be lifted.
With a taut string water or laser level make a straight line from one side of the foundation to the other.
Raise the lower end of the level until the bubble is centered then measure the distance from the bottom of the level to the floor to find the depth of the dip.
The level shouldn t be off by more than 3 16 inch 0 48 cm any minor deviations you happen to discover shouldn t impact the stability of the finished floor.
You may find this task easier if you hold the string off the sagging floor joists by attaching blocks of the same thickness at opposite sides of the basement.
Assign a person to each jack and raise the jacks slowly and at the same time until the spirit level shows the house is level.
Lay a long level downhill on the floor with one end of the level on the level part of the floor and the other end at the lowest point.
Check to ensure that the product you purchase is compatible with your floor.
All you re going to need is to find the location of the sagging beams and to bring them back to level with a house jack many of which are built for hundreds of tons.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.