I have a 20 year old deck. One of the foundation posts (4x4) has sunken about an inch. The 4x4 post goes into the ground where it is affixed in concrete.
The 4x4 post is notched at the top and two carriage bolts hold it to the beam. The beam is two 2x10s.
I'm thinking the best way to correct the issue is to jack up the three joists that are sunken and put spacers between them and the beam. Is this good? If so, what should I use as a spacer? If not, any suggestions?