As I piece together my tarp plan, I realize I'm confused on how to sew a proper seam joining panels of silnylon.
I gather the seam as depicted by Mountainfitter in this thread: http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=73739&startat=20 – is plenty strong.
Is there a step-by-step diagram out there to achieve this sort of seam?
The seam Dan Cooke uses on his tarps, which in my own experience has been so far flawless in terms of strength durability, appears to be the sort of seam where 2 stitch lines appear on one side, whereas on the opposite side of the fabric, only 1 stitch line is visible.
I think Dan Cooke's "double stitched lapped seam," as used on his tarps ("French seam," "felled seam"…so many names I don't know which designates it properly) is easiest, but I'd rather use an overkill seam given my own sewing will be well-below the CCS standard.
Looking at the flat-felled or knock-off seams, I can't picture how to sew each line of stitching to avoid, for example, 2 lines of stitches in the same line when the layers of fabric are folded over each other.
I recognize and apologize for the ignorance contained in the forgoing.
