If this reinforcement is being sewn through the center I would want it on the underside. If it were to double as a ridge cord it would be less likely to tear away and also damage the tarp.
If the reinforcement were sewn along a higher pitch the potential for leaking is non existent. If the stitching goes through a low point, then leakage is a concern and the waterproofing a must.
The webbing doesn't need to be webbing. It could be a tape, (light webbing if you will), and still provide more than adequate strength.
If the reinforcement were sewn along a higher pitch the potential for leaking is non existent. If the stitching goes through a low point, then leakage is a concern and the waterproofing a must.
The webbing doesn't need to be webbing. It could be a tape, (light webbing if you will), and still provide more than adequate strength.