50 Pack Snow Guards for Metal Roofs, Plastic Roof Ice Guard for Standing Seam Metal Roofing, Stops Roof Snow from Breaking Up (Includes Set Screws)

I recently replaced my asphalt shingle roof with a traditional standing seam roof, and our first winter with the new roof ended up being one with heavy snowfall and ice in the Virginia Appalachians. I found that the thick sheets of snow and ice ripped off my gutter guards and came rumbling down off my roof with enough force to kill someone, so I realized I needed some snow stops to slow the flow off my roof.Recognize that these guards are designed for traditional standing seam metal roofs only, they will not work on corrugated metal roofs or metal roofs with exposed fasteners (screw-down panel roofs), even those that have what look like an occasional seam. These guards will only affix to a traditional thin seam, as they only have a half-inch opening width.Each guard is very lightweight at only 2.6-ounces and each guard has two stainless steel set screws that affix to the seam with a supplied Allen wrench, but you’ll find installation easier and faster if you use a ratchet wrench with an extension bar and 3/16-inch Hex head bit. No instructions were included with this set, but I did some research and learned that they should be tightened to around 150 in/lbs. (12 ft/lbs.); if you make them too tight you can crack the bracket.Based on the pitch of my roof, I installed one guard per seam, staggering them at 12-inches and 24-inches from the edge of the roof line above the gutters, with additional guards over any doorway 2-inches back from the roof line.I do have a few issues with this set in addition to the lack of instructions. The screws were packaged loose in a cheap bag that exploded in the box. After gathering them up and installing them in the brackets, I was fortunate to find that no screws were missing. I also do not like that the end of each set-screw is slightly concave, so when you tighten them down, they make a round impression into the seam, marring the paint on my roof. I ended up driving the screws into the folded side of the seam to minimize damage, but there should have been a rubber or silicone strip on the end of the set screw to prevent this.It is springtime when I installed these, so I cannot yet speak to the efficacy or durability of these plastic snow guards, but when winter comes, if I have any issues, I will return to update this review.