I put a steel roof on my shop last year and found out too late that I need some kind of snow block or guard to keep the sheets from flattening my gutters and goats. I found some molded plastic guards at Lowes. They look to be well built, but they are plastic. I'm looking for feedback from anyone who may have used these or one that you prefer. My average snowfall is 3 feet per year, it's a 5/12 pitch and the roof is 15 feet peak to gutter. Thanks.