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Tag Archives: snow rails
Snow rails (or snow guards) come in both metal and plastic formats, but it is generally considered that for metal roofing set ups, plastic snow rails are best. The plastic snow guard came about in 1976, when it was discovered that metal guards were causing some damage to metal roofing and the situation was reconsidered. In addition to getting brittle and breaking in the cold, some of the metal guards were causing severe metal reactions that ended up eroding the metal panel finish. In these cases the conductive liquid or electrolyte was rainwater. During evaporation water becomes concentrated and water films become more conductive, causing the initially benign water to create a dynamic galvanic effect, which causes rust. Continue reading