I had a large tree in my yard cut down to about 8' above ground. It now has two stumps joined at the base. I am planning to build a treehouse for my kids around the stump with the weight being held by 1/2 inch threaded rods through the trees holding up 2x10s.
The stumps are about 20 inches in diameter. I am worried that it might not be long before the stumps will rot and be too weak to hold up the weight of the treehouse.
How long of a life can I expect from my treehouse? Is there anything I can do to increase the life?
I am planning on treating the top of the stumps with bora-care to deter bugs. Any other suggestions would be much appreciated.