My run is only 20' x 20' and I'm thinking about replacing the 1/2 of the run that has poultry net on it someday with the same stuff you used. Did you have to have some kind of a brace under it? Will it sag if you don't?
Yes the barrier netting will sag especially when splicing it together for width, roll is 48" wide. I left my run posts high and attached to the coop roof and the fence posts.
You can cut the width to about 1 foot wide and make a grid pattern like you would fishing line to save on weight and sag.