Metal Roof Slope Snow

In snowy areas your roof should be at least 10 12 40 to allow snow to shed while the safest roof pitch in very windy areas is between 4 12 6 12 18 5 26 5.

Metal roof slope snow.

Others allow a 1 4 inch slope. Minimum pitch for metal roof the minimum roof slope for metal roofs is dependent upon the roof profile. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. For a gothic style the rafters must equal the span 60 while an elizabethan style requires the rafters to be longer than the span.

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. A roof shall be considered unobstructed if no objects exist on it that prevent snow on it from sliding. Some metal building manufacturers will not warranty a roof with a 1 4 inch slope. 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.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. 3 12 1 2 12 and 1 4 12. Slippery surfaces shall include metal slate glass and bituminous rubber and plastic membranes with a smooth surface. It makes sense when designing a metal roof to shed snow not to keep it on.

However when determining the pitch for a new roof both climate and materials should be considered. 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. The most common slopes are. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

It is critical that a designer specify enough snow retention devices based on the slope and snow load. For example a roof with a 6 inch 12 pitch is one where it rises 6 inches vertically for every 12 inches of the horizontal run. 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. Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span.