Regarding the other two piers that are still 3.5 inches below the rest of the floor. I don't think I can set my new steel post in the hole because the adjusting bolt will be out of reach of a wrench. I expect I will have to pour in concrete to fill the hole, then set the post on that. Three questions:
1. Any special type of concrete?
2. How long to let the concrete cure before setting the post on it?
3. Should I fill the concrete level with the floor, or raise it a little like what was done to the third pier that I have? Not sure of the advantages. Perhaps it helps not to crack the surrounding floor?
Thanks for any suggestions! I can probably ask the folks at Home Depot about #1 and #2, but I'm clueless on #3.