DIAGONAL SUPPORT
1. Cut wedges in the ends of the two 2' x 4's.2. Nail one end to the underside of the frame, the other to the bottom of the posts.
THE FLOOR
1. Run 2' x 6' floor joists 16 inches apart and parallel to the original 2' x 6' board. Nail from outside the frame.2. Cut the floorboards to length and lay them perpendicular to the joists.
3. Cut notches in the end planks to fit around the posts and all four rail supports.
4. If desired, cut curves in the floorboards to allow tree limbs to come through.
TIPS
• Leave some space between floorboards for rain, but not toes, to fall through.• To ensure a sturdy tree house, you may have to shake the corners of the frame while building. It becomes a kind of tic: shake the frame, climb down the ladder, stare up, climb back, shake the frame.
