Don t constrict branches with rope straps or wire.
Treehouse roof around tree.
Add spacers between the beams and the tree to allow movement.
These two boards will serve as a support beam for the rest of the structure.
If your design calls for a flat roof try to introduce even a small slope of 3 5 so water cannot sit there.
The roof will extend the life of the tree house and is just as important as the rest of the framing.
Be sure the tree is at least 12 inches in diameter.
If you are building a tree house you can frame a roof for it on your own.
When designing a treehouse in a single tree it is often necessary to pass the trunk and or major branches through the walls or roof of the structure to maximize space and achieve weight balance.
Use extra long large bolts.
The ideal roof is impervious to water but also needs to rapidly shed water so there is no chance of pools or damp patches building up.
Lag two sets of beams to the tree using a 3 4 diameter x 10 lag screw.
The down side as you point out is that it is nearly impossible to seal the water from entering through these exit points.
The treehouse was in a very very large oak tree.
Try to to drill the pilot holes as straight and level as possible.
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To accommodate tree movement and growth allow gaps around any branches or trunks that penetrate the tree house.
An extension cable from a pole mounted outlet provided power.
It was almost something out of a beatrix potter book.
It had a gravity fed cistern from rain water for a water system and a wood stove.
Once the frame is square install your floor joist.
The roof s primary role is of protection and so it is a good place to get right.
Don t restrict tree growth.
This can strangle the tree.
The top set of beams will be the floor height of your treehouse.
Next install the perimeter beams to the top set o beams and square them up using the 3 4 5 rule.
Leave gaps around the tree.
A properly sloped or pitched roof is much superior.
A flat roof is the easiest to install and when built correctly is easy to maintain.