reviving this old thread
Searching the forum--some two years after most of this discussion-- I wonder what has evolved & if this thread might be revisited by some of the previous listers.
I'm /forever/ pondering the best way to flexibly attach a treehouse frame within the finger-like limbs of a large mango up a steep slope above my house. With other projects stalled, I am about to take action now that I've got a temporary bamboo scaffold lashed in to the limbs for construction access. The real frame and supports are something I NEVER want to worry about or think about rebuilding, so I'm shooting for a lifetime solution for attachment points and frame at least.
I keep coming back to what sounds essentially like the same basic idea that a couple of folks posted or touched on for attachment points: stainless cables through the major branches around the 'perimeter', forming a cable handrail of sorts, from which the floor-framing would be suspended, using something like turnbuckles and chain or more cable, to allow adjustability as the tree grows. But rather than sleeving the drilled cable-holes in the limbs as I'd once planned and one post mentioned, it seems to me that it might be better to thread the cable directly through tight-fitting holes drilled in the mango, to allow the tree to heal over and envelop the cable directly. This way, I envision that the sections of cable would become structurally independent, and not shift each other around as the loads vary. As for flexibility, with cable this is inherent.
Can I do anything to mitigate shock to the tree from this drilling? Should I make an attempt to seal the holes after the cable is in, maybe with polyurethane caulk or some such?
Might it not be better to drill the holes through a chord (and not the center) of a branch, in terms of wounds (as well as strength), or is a hole through the center just as bad as through other parts beneath the cambium?
I'm thinking 1/2" cable, or several strands of something smaller like 5/16", perhaps, both for redundancy and ease of working. I hope to swage the splice/s, after tensioning the cable... with something I haven't invented yet...though I may have to fall back on leaving a turnbuckle installed instead.
Thoughts?
Mahalo...Dave