Originally Posted by WV
It sounds like you're presuming that a taped seam is a potential weak point in the tarp's construction.
No, I do realize that it's stronger (I follow all the cuben discussion here, even if I haven't commented).
From my experience it takes more tension on the ends of the tarp to get it taut than if I use a ridgeline underneath it. And I don't see any benefit to having more tension on that seam, even if it is stronger than the rest of the fabric.
But that's just my take on it. I'm not an expert regarding the fabric or anything of the sort.