This is an as-built of a construction detail I found during a recent demolition. The craftsmanship was pretty good. This is in South Calif. where we don’t get a lot of rain. Probably 40 years old. There was a deck attached at the floor level with a ledger nailed to the blocks for the plywood below the water table. The only deteroriation was behind the ledger. This was built by somebody who knew his way around tools, had no clue about normal construction techniques, had a limited budget but all the time in the world.