Metal Roof Slope For Snow

The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope.

Metal roof slope for snow.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. Metal is rising in popularity as recycled options have improved in quality and can be cheaper than purchasing tiles. The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. If roofing material is installed on a roof with a slope that is less than what is specified by the manufacturer it will void the warranty.

This is particularly important to pay attention to when using metal roofing products such as standing seam metal which have a multitude of profiles attachment methods and seam lap joint styles which can affect the recommended slope. It makes sense when designing a metal roof to shed snow not to keep it on. The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. There are some opinions that standing seam metal roof minimum slope is 12 but it increases the possibility of leaking on the few first days of snow arrival.

However if your area is prone to hail avoid installing a metal roof as denting will occur. But without designing the snow retention based on accurate testing you could be wishing you had that steep slope and metal roof which was always intended to shed snow. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed. Asphalt is the most versatile and works well in any roof pitch climate.