welcome to the forums
i agree with your concern in regards to potential damage to trees, as i've stated several times on here (not much of a popular opinion as you can see
![Wink](https://www.hammockforums.net/forum/images/smilies/wink.png)
). but you don't need to make the entire ridgeline out of webbing, just use the treestraps that your hammock is suspended to (i described this a while ago in a thread called "the levitating tarp" or something of that sort; edit:
here).
this way you get the full protection for the trees, and you also save line you would have to otherwise wrap around the tree just for the tarp, and save a lot of trouble (i just connect my tarp ridgeline to the treestrap with a softshackle on each side, and then pull the ridgeline through the tensioners to adjust tension, it litterally takes seconds)
edit: <sigh> and i failed to answer your question (sorry, should have coffee first, answer after)
to your question: prusiks themselves are the wrong tool for the job even on rope, imo. rope on webbing, they will be quite a pain (they will hold fine, but they will be terribly jammy). for attaching the ridgeline to "normal" treestraps (before i redesigned the treestraps too), i was using a piece of paracord or equivalent, with either a one wrap klemheist or even a larkshead (so one wrap prusik you might say). i preferred the klemheist (although i don't use it for anything else), thin (3-4mm) rope on webbing will work very nicely. now, if you'll be using ultralight dyneema webbing, that might be a different story. if it proves to be too slippery, you can always use a blake hitch, or a valdotain tressee (that is to say, proper friction hitches, not prusik :P ). i would still advise to consider hooking on directly to the treestraps (so reusing the hammock suspension treestraps tosupport the tarp too), and using a "normal" ridgeline, as i noted above.
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