I've got two 15" trees about 15 feet apart and plan to build a ladder frame across the gap and then build a tree house atop that that will be 36" wide and perhaps 8 feet long. It will be 10 feet off the ground. The trees move in the wind obviously, and I'm looking for a good way to attach the two main frame rails to them. The easy way would be to sink a heavy lag bolt through each main rail into the tree, but I'm worried I'll damage the tree. Some think it's no big deal to put something straight into the tree, that it's things that girdle a tree that cause it to die. I tend to agree with this.
My other thought would be to wrap the tree at the attachment point with rubber or wood and cinch a chain or cable around that with an eye toward not cutting into the tree over the years. Unfortunately that won't provide as solid an attachment as a big bolt directly to the tree and with perhaps several kids up there and 10 feet to fall I'm hesitant.
Anyone think of or used another way to attach boards to a tree trunk for this type of thing? I'll also be doing the old fashioned "rungs up the tree trunk" so more screws into the trunk. Does it matter if they're in line with each other (I seem to recall the flow of trees is in lines up the center and down the bark)?
Any arborists out there?
DougM
My other thought would be to wrap the tree at the attachment point with rubber or wood and cinch a chain or cable around that with an eye toward not cutting into the tree over the years. Unfortunately that won't provide as solid an attachment as a big bolt directly to the tree and with perhaps several kids up there and 10 feet to fall I'm hesitant.
Anyone think of or used another way to attach boards to a tree trunk for this type of thing? I'll also be doing the old fashioned "rungs up the tree trunk" so more screws into the trunk. Does it matter if they're in line with each other (I seem to recall the flow of trees is in lines up the center and down the bark)?
Any arborists out there?
DougM