In building a treehouse part three, we list the final steps needed to finish this simple treehouse, which is great for beginner do it yourselfers.
We begin laying the deck in this step. Get up on your platform and put down the deck, use a jigsaw to cut around the tree trunks, with a 1-2″ gap all around. A compass for drawing circles can be used to help mark the jigsaw cuts.
Railing is a safety plus, use 2 x 4′s and two 40″ lengths at each corner as uprights. Screw them to each other, then nail them to the platform. The handrail should measure 2 x 4, laid flat, and can then be nailed straight down into the uprights. Finish up by mitering the corners and screwing the handrails to each other through the miter.
To finish the sides, you may use rope, plywood, or other material you have lying around to fill in under the railing. Strips of 1 x 1 is all thats required to hold them in place on either side under the railing.
The ladder to the tree house can be a rope ladder, a purchased ladder, or if you prefer you can make one.
For the roof, keep it simple. String a bungee cord between two hooks, which has been put into the trees at about 7′ above the deck, then put a tarp on top. Use a compound mitre saw like the Milwaukee 6955-20 12″ Dual-Bevel Sliding Compound Miter Saw, cut four outriggers and screw them to the uprights, as this will keep the sides up.
Now load up on Nerf guns and water pistols! This tree house is big enough for two single air mattresses, so you and the kids can camp out in it. Also add a swing or a braided rope as you make this tree house your own.