I've started rebuilding the foundation of my shed. I just discovered that I have concrete piers (likely 4' deep cause we're have freeze here). The picture shows the concrete pier from the side, because I have not moved the shed off the existing foundation yet.
However, since those concrete piers were poured decades ago, the yard has been re-graded, so now some of those poured concrete piers are below grade by as much as 3".
I am planning to add new concrete to the top of the concrete piers that are too low, to bring them higher, because attaching my new shed base (PT wood) to a concrete pier that is below grade is only asking for future rot.
BUT, the surfaces of the existing piers are not flat (so I can't just drop a concrete block on the top). The round formed concrete (3" high) protrudes from the footing, and then there is a metal post anchor (4" high) in the top of that. So I would have to add at least 7" of new concrete.
Can I just place a form, add concrete adhesive according to directions, and throw in the 7" of new concrete and a new post anchor? Or is there something else I need to consider?
Thanks for your help.