On Thursday, July 26, 2018 at 10:46:05 AM UTC-5, DerbyDad03 wrote:


That is very close to what we had in mind, other than the "diagonal" rafter
between the trunks. Considered it, not sure it's needed.

The main idea was to "box" in each trunk with 2x6's

Along the line of over kill(?), your "not sure it's needed" comment: The trunks to be boxed in, with the boxing members at 90°. A diagonal bracing, in the corners or in some fashion, would further prevent racking, if the boxed joints area are the weakest, in the structure's whole system.

I don't know tree house construction. Maybe my idea of a more rigid framing system is not correct. Maybe the structure needs to be a little flexible, for when the trees move in the wind, etc. But I would think one needs to guard against too much racking, potential racking.

Sonny