Roof snow guards are a roofing specialty item that help keep snow and ice from sliding off of metal roofs. Currently there are two basic types of metal roof snow guards on the market, clamp on snow guards that attach to the seam of a standing seam metal roof and valley or panel snow guards which are attached to the roof in between seams or ribs. Some people would mention a third category being mini snow guards, but minis are really just a small version of the valley or panel style. The idea is to stop snow so that it cannot slide down and off of the roof. Using the guards as literal snow blocks can save you money and pain by keeping the snow from causing damage to anything that may unfortunately be found under the eave when snow is sliding off a metal roof.