I bought some heavy duty 1" nylon flat webbing for jacklines. Turns out the stuff is really slippery. I can't just use a clove hitch to attach to a cleat. It pulls right out. What kind of attachement should I use on each end? Does it need to be adjustable? Maybe a loop sewn in, a carabiner...?
At Home Depot, I found a ratcheting tie-down that was sold singularly. I am considering using a loop sewn into one end and the ratchet part of the tie-down to pull that tight. I won't be over-tightening it, but the ratchet should let it be adjustable.
Clove hitch??? Do you mean cleat hitch? Clove hitch doesn't hold very well even in it's intended use.
I take a full turn on the bow cleat and finish with cleat hitch, no problems so far. Get them as tight as you can. Or you can sew loops into each end. Put one end over the cleat and the other end lash to the other anchor point.
Over the years I have noticed that most "jack lines" do have a -heavily- stitched loop in one end. We usually just take the other end to a horn cleat and apply a cleat hitch with some extra added hitches to account for the slipperyness of the material.
(Agreed also that a "clove hitch" is easy to work loose with most any line.)
No matter what hitch or knot you start with, it's ok to add some additional hitches with the free end.... after all, that's what a "hitch" or "knot" does: adds enough layers of friction of line against itself that it does not pull loose, for the given purpose and material.
I have sewn loops in one end. The first two photos are my cockpit jackine. I terminate the aft end via a water knot. You can use the water knot to fashion a loop too. The aft ends of my main jacks terminate using a cleat hitch. If they are going to be out for several days, sometimes I chicken out and fasten a plastic cable tie over the finished cleat hitch.
Look at some climbing sites for good info on tying webbing. What Joel H. says above is what works for me, bowlines tie well in webbing as well as a "waterman's knot" which may be what Joel H. is describing as a "tape knot?", never heard that term before so I learned something today. Time to quit.