> I'd be curious if anyone had problems due to NOT using a ridge line?
Pete, I would personally not use the tarp without a ridge line cord. The ridge line is subject to significant forces, especially tension. The one thing polycryo is vulnerable to is tearing, and for just a couple of grams (I use 1 mm 150 lb. dyneema cord) you can virtually eliminate that danger. Also, the ridge line cord, when properly constructed, takes all the stress off the tape-to-tarp connection at the ridge line. Plus, the ridge line cord holds the A-frame shape of the pitched tarp and keeps a nice taut pitch in side winds.