Jack up that portion of the house and place new footers.
How to jack up a wood floor.
You cannot jack up a house in one day.
Slowly jack up the floor.
It took a long time for your floor to sink so you can t push it back up quickly without causing cracks and stress in the building.
Keep an eye on the girder so that it does not get out of position and try to roll.
You cannot simply put a screw jack under the lowest spot and start turning.
It has to be jacked up slowly over days or even weeks to avoid cracking drywall plaster windows and even structural elements.
Use a string to watch the floor come up.
Raising up a shed w a car jack and adding concrete blocks.
In this series i am taking an old 10 x 14 foot pre fab shed and making it a finished office and.
As with other structural repairs jacking must also be done appropriately.
Jacking must proceed slowly.