Getting up and around the treehouse to put up the rafters and roofing led to some "contemplation." Since the roof tilted only 40deg or so from vertical, I really didn't want to be climbing around up there unprotected. That meant that I wanted to be able to assemble the roof as much as possible from inside the treehouse. Up on a step-ladder if at all possible. With this in mind, I decided the simplest approach would be to use super light, 2-foot wide, corrugated polycarbonate panels for the roof. I was originally thinking of using sheathing with cedar shingles, but this would have required a lot of scrambling up on the roof. In contrast, the panels are fairly cheap, relatively nice looking, long-lasting, easily sourced from local big-box, and could be assembled one after the other from inside the treehouse (mostly). I had some visitors from the local squirrel family (who live in a near-by oak) come by to inspect my work (see photo).
The polycarbonate panels do require special screws that have a rubber element under the cap to keep it water-proof. Also they ideally need this plastic undulating snap-in support rail that rests on purlins (2x3's) which I had to put up orthogonally to the rafters...
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