I'm resurfacing a deck. It was built 19-20 years ago. Had an inspection and was recommended to replace 4x4 direct-bury posts with 6x6 with concrete piers/footings. This work isn't as simple as jacking the deck and digging (sistered boards against 4x4s, posts right against foundation, stone pavers and drainage pipes to deal with; not to mention 30"x22"x22" dig with 70 bags of concrete). The posts are currently fine after 20 years. I'd rather just leave it and deal with replacement in 10-30 years. But is there anything I can do with existing buried posts to extend the life? There are some related answers (only 1 for existing, and none discussing post protectors) and looks like my options are:
- post protectors - no mention of using these post-construction to extend life
- blueskin around the posts
- concrete - not recommended because of 'collar rot'
- packed gravel around post - haven't seen any mention of this
Would a post protector work to extend the life (I would probably have to cut it to get it around the existing buried post) or would any other alternative work better? at all?