In case your house looks uneven or sagging as a result of a sinking foundation, it can be raised or lifted with several hydraulic jacks to be levelled out.
In this case, any sagging bearers/beams will be located and lifted to their normal level. Hydraulic jacks can lift several tons.
Once the house is lifted and levelled, concrete stumps are placed beneath the sagging bearers/beams to support the raised level in place. The process of jacking up a sagging house includes:
First, access the area beneath your house. Check for the beams/bearers holding up your house. In case the foundation appears to be sinking, lift the sinking section with a jack.
Check for any bowed beams beneath the house that appear to be sunk lower than other beams. Also, check where the floor is sagging and mark the problematic bearer/beam beneath.
Next, position a hydraulic jack below the sunk beam. Jack it up to level the house. Use non-sagging beams as the ideal height when jacking up your house.
Jack up the beam slowly such that it gradually shifts and readjusts until its level again. In case several beams require being jacked up, use several jacks to lift them simultaneously.
Get a concrete stump and place it under the beam such that the new level will be maintained upon removing the jack. You should size them in such a way that they fit into the raised gap perfectly.
The stump should be placed close to the jack and centered properly under the beam so that once the jack is removed, the stump will support the load that the hydraulic jack held.