So in general the shallower pitch can be more dangerous with bigger slides.
Proper roof pitch for snow.
If the design necessitates a roof slope that drains onto a traffic area snow retention devices should be provided to hold the snow in place.
The pitch of your roof also helps determine the type of materials that can be used on your roofing system.
Begin by measuring 12 inches on your level and marking it with a pencil.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
Pitch is a measure of the steepness of a roof.
The pitch of the roof is determined by the vertical rise in inches for every horizontal twelve inch length.
Any pitch higher than 9 12 is considered a steep pitch.
You can safely measure the roof pitch from inside your attic with a level that is either 18 or 24 inches a tape measure and a pencil.
The roof pitch would be described as a 6 12 pitch.
The primary reason roof pitch exists in the first place is to redirect water.
A flat roof would have a 2 12 pitch while the average roof pitch would be between 4 12 and 9 12.
Divide the results by the number of 12 inch segments in your level.
The higher the roof pitch the more often the snow slides off.
For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12.
But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.