I think I’ve just come up with an elegant new joist plan for the next 12-foot yurt platform. It looks like this:

12 foot yurt platform

This plan uses larger joists than I normally do, in a square on four posts, with smaller joists between, strengthened by noggins.

Four extra posts will complete the “circle”, allowing my normal 23mm thick pine flooring to be secured close to the edge, which will carry the weight of the coppiced ash frame.

(The post in the middle isn’t necessary but I might include it to stop any bounce.)

Interestingly (to me, anyway), I tried three joist layouts on paper and all required 33 metres of joist. The other two needed 12 and 17 posts, though, which is why they didn’t win.