I am building a tree house. The platform will be 16' x16'. There will be two 16' foot beams spanning the distance between two different sets of trees located in a square. Upon those two beams floor joists will rest and will be 16' long. The tree house will be 12' x 12' and sit in the middle of the platform. Two questions: 1) what must the dimensions for the two beams be; and 2) what must the dimensions of the floor joists be?
Nothing. I'm waiting for an expert opinion.
okay. I'll wait. Bigfork Montana. Lateral resistance?
Are you still there?
I had a bit of an emergency come up.
Lateral resistance means you need some way to resist lateral forces. I will size these for gravity only. Is that reasonable?
I see what you're saying on the lateral issues. I actually have something called a Garnier Limb for the tree attachment. It has a sliding brace allows the tree to sway without moving the rest of the tree house. I'll await your advice on the size of the beams. Thank you.
Great. I can size them now if you can hang out for a few minutes.
The joists can be 2x12 @ 9" o.c. Southern Pine No. 2
The main beams will have to be pressure treated glulam - 5-1/8" x 15" with a min Fb of 2400 psi and a min E of 1800 ksi.
If you've found my answer helpful, please click the green"accept" button. I'll be happy to answer additional questionson the topic. If you could provide feedback, I would appreciate it.
No problem. Best of luck with your project.