Two Trees: Platform Spanning Between Trunks Two Trees: Platform Spanning Between TrunksTwo large trees spaced about 6 ft. to 8 ft. apart allow for an open platform with a simple structure. This platform is supported by two 2×10 beams attached on both sides of the host trees with fixed anchors. The floor frame cantilevers to the sides of the beams and must be supported at each corner with a 2 × 6 knee brace anchored to the side of the tree. This rigid design is suitable for mature trees (at least 10" in diameter) at a low height where movement is slight. As shown, the platform decking is made of 2 × 6 boards. For thinner decking boards two additional common joists are required to reduce the joist spacing to about 16" on center.
NOTE: The platform frame is not safe to stand on before the knee braces are installed.