How will my supports be affected by tree growth over time?
As the supporting bolts are fixed to the heartwood of the tree, and the tree expands by adding layers of growth each year, the bolts will gradually be absorbed into the growing surface of the tree. This effect looks like the bolt is being gradually pulled into the tree, but its position does not actually change. When a beam is bolted directly against a tree, the beam prevents growth where it touches the bark. The bark will appear to bulge around the beam to compensate. This is generally harmless, but will leave a very obvious scar if the treehouse is removed. The swelling can be prevented for a few years by adding a collar between the beam and tree surface made from a piece of metal pipe. The tree will grow around the collar and will not reach the beam for some time, depending on the growth rate of the tree.
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