One of the reasons I chose to double up 2 2x10 beams for the supports was so I could drill a hole down the middle for a flexible anchor. A flexible anchor is needed so that when the wind blows your tree around, the tree can move without putting stress on the treehouse. If you just lag bolt all the beams to several trees, it can rip the whole house apart. Of course larger diameter trees are safer for this, and a single tree treehouse doesn't need to deal with flexible anchors. I decided to make the flexible anchor with a 5/8" thick eye-bolt, attached to a rigging twin clevis link, attached to an 8" long 5/8" thick eye-screw that was driven into the hemlock trees. This was a nice idea as you could turn the nut to move the beam up and down, getting it level in space - so important for the platform!!Monday, October 10, 2016
Flexible anchor
One of the reasons I chose to double up 2 2x10 beams for the supports was so I could drill a hole down the middle for a flexible anchor. A flexible anchor is needed so that when the wind blows your tree around, the tree can move without putting stress on the treehouse. If you just lag bolt all the beams to several trees, it can rip the whole house apart. Of course larger diameter trees are safer for this, and a single tree treehouse doesn't need to deal with flexible anchors. I decided to make the flexible anchor with a 5/8" thick eye-bolt, attached to a rigging twin clevis link, attached to an 8" long 5/8" thick eye-screw that was driven into the hemlock trees. This was a nice idea as you could turn the nut to move the beam up and down, getting it level in space - so important for the platform!!
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