I'm looking to place a cut 18" oak tree trunk about 10'-12' tall total into a play/climbing structure. At the top will be a tree house. The trunk and branches will extend only up to about the tree house floor structure. I'm not sure if the tree trunk will be used as a structural element or not. My question is in how to treat the tree to ensure maximum life/durability in our indoor situation. Any ideas? I know creosote is a darn good preservative having used it quite a bit in the tropics when we sunk fresh cut poles in concrete and dirt. The trunk will not be dry/cured. Thanks for any suggestions and ideas in advance - 
mk
mk
