The first step for foundation underpinning is to excavate the side of the basement that is sinking down to the footings.
Next we dig holes under the footings down to the bedrock.
We place forms over the undermined footing and pour it full of concrete.
Now we build forms and pour concrete under the existing footing.
Now we dig more holes next to the holes that have already been filled with concrete.
Now we fill in all the voids underneath the footing and add backfill.