I have a backyard porch that has 2 load bearing posts (the other side are attached on the house). The wood base trims around the bottoms of the posts looked rotten so I wanted to replace these trims. After opening the trims, I found the posts themselves were rotten by moisture from the bottom as they touch ground and there are working irrigation heads nearby. Now I wonder if these posts are repairable, and if not, how to replace them.
These posts are ~12 years old. Each post is 7 1/2 inch (width) by 7 1/2 inch (thickness) by 12 1/2 feet (height). They were secured on the ground with Simpson Strong-Tie CB88 column bases in concrete. Each post has 2 bolts on the top to the railings and 2 bolts on the column bases.
Each CB88 column base has 2 bolts. The external rotten area starts at the post bottom and goes up close to around the column base's bottom bolt height. I think inside these posts, the rot may progress even higher. I dug some holes on a post with a screwdriver; it was soft internally, and blackened by fungus infestation.
If these posts must be replaced, is it a DIY project?
Attach a few images showing the porch and posts' rot.
How to tell if these posts are still repairable? For instance, if I dry the wood, and apply lay up & laminating resin, then fill-it epoxy filler, perhaps add fungicide (Bora care or TimBor), will this buy me a few more years before replacing these posts?