Follow the manufacturer's step-by-step instructions to unpack the box.
A lot of the work on the tree fort has already been done at the manufacturer, such as the windows and panels.
Take measurements to figure out where you want the tree fort. When digging postholes, it's best to move about 10' away from tree. This way you are less likely to hit any of the large roots.
You'll need help unloading the kit due to its size and weight.
Attach two cross braces to each 4 x 4 (Image 1), which will give the structure added strength. Once they are all in place you can then tighten the nuts down.
Note: Be careful not to over tighten the nuts because the cedar is fairly soft.
Run a short piece of rebar through the post (Image 2) to help stabilize the footings in the cement.
When deciding where to place the freestanding tree fort, bear in mind that it would be great and convenient to be able to watch your children from the deck or patio. Also, it's a good idea to blend the fort in with the surrounding branches from the tree or trees.
Use a power auger or posthole digger to drill holes for footings. When drilling the holes with an auger, if you feel any resistance you've probably hit a root. If this happens you may want to move over a few inches.
Note: The cost to rent a power auger is approximately $150 a day -- and add a $50 delivery fee.
Place the posts in the holes, and level the base using a 6' level. After assembling the structure, pour fast-drying cement into the holes and add water. Give it a good stir and the concrete will set overnight.
Pour fast-drying concrete in the holes that support the posts. You can do this with an easy technique -- instead of using a wheel barrel simply pour the concrete mix right into the hole, add water and give the compound a good stir. Let it setup overnight and the fort will be on solid footing by morning.