I was toying with the idea of a post and beam style foundation for it, since the location its going is clay soil with a tendency to get water logged, and there are plenty of tree roots in the area. So a traditional concrete raft would have to be a fairly hefty construction probably with some reinforcement in there as well.
Not having done one like this before, what are the best options for posts that are not going to rot? Treated timber posts, stub concrete posts, plastic tube full of concrete, or just build a blockwork pier on a pad foundation?
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