Snow guards are like tabs that are strategically placed on a roof. They are placed in those areas in which snow begins to slide when it starts to melt. Being that snow starts to melt from its underside first, the water that results forms a lubricant on the roof that causes the snow on the top layer to slide. This is what causes an avalanche off of a roof. If anyone is standing below, they can become injured. Property and landscaping can also be damaged from this type of avalanche. With a snow guard in place, that is no longer an issue. Snow guards will hold the snow in place so that it doesn’t slide off.