I have had bird netting stretched over my run for 4 years, and it has held up to snow, ice, even small branches falling on it and my cat walking on it. It is not sloped, it kind of sags. At the widest, it's stretched 25' and is attached to 5' high cattle panels with zip ties. With a heavy load it sags a lot, but bounces back after I knock it off. One year a big branch fell and tore it, but I repaired the tear with zip ties.