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I probably can’t make a batter and flat top work for my planned obs build. I intend to put in a raised timber floor so the block needs to allow for footings to support the joists. By the time I add another 400mm or so to the top of the block I might be getting a bit wide?
I might just go a little deeper. Some movement over time might be inevitable given about 700 of the 900mm or so is in clay so probably reactive soil. Although once an obs is built over it there should not be much variation in moisture to contend with.
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