Metal roofs are used on pitched roofs and designed to shed snow. However, these roofs can create problems because the snow does not always slide off of the roof, regardless of pitch. When the snow does slide, it can happen without warning, endangering life and property. Great care in design and planning are required to ensure that snow shed areas are clear.
This is an example of a metal roof that has recently shed snow. Note that snow on only one side of the roof has slid, causing uneven loading and possible movement of the roof structure.
In this example, the snow on the roof of the house has recently fallen, but the snow remains on the garage portion of the roof. Even the steep roof pitch does not ensure snow shedding, and if the snow on the garage roof does slide, it will fill the driveway and could possibly hit a person or vehicle.