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I am in the process of building a tree house for my sons and have access to three local sawmills that are now cutting white oak. I would like to use white oak for the foundation and support structure because of its strength and durability. The only problem is the sawmills only have green white oak.
I have gone to Lowes and Home Depot for pressure treated pine, and since it's stored outdoors, it's also wet.
In my opinion, both the white oak and PT pine are going to shrink once I secure them to the trees. Yet I fear either may pull out of square or level in the tree, making playing in it dangerous.
I am familiar with an early structure Frank Lloyd Wright built out of green lumber in the early 1920's, using it right on top of the dirt foundation. Of course, the structure is now in need of serious structural repair. However, for my purposes at present I'm thinking that if a green-wood built house can last this long, then surely a green-wood built tree house foundation would meet my needs.
Any input you can provide would be appreciated.