The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Minimum roof pitch for snow.
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 20 0 for slate roofs.
The standard of lower pitch actually ranges between 1 12 to 5 12.
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.
The smallest pitch of a roof is 0 5 12.
Minimum roof pitch for shingles.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
What is the smallest pitch of a roof.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
If you are adding an addition to your home or installing skylights knowing the existing pitch is important.