The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Minium roof pitch.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.
Corrugated metal roofing has the same minimum pitch.
The minimum requirement is 2 12.
Shingles of all types need to have a slope to function properly.
So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.
The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12.
There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.
The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.
Anything above that will require you to put out higher cost because they are already considered as higher pitch.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
The standard of lower pitch actually ranges between 1 12 to 5 12.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.
Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles.
In the usa the range of standard pitches is anywhere between 4 12 and 9 12.
Roof pitch varies depending on culture climate style and available materials.
In the uk the typical house has a pitch between 40 50 although 45 should be avoided.
There is no standard universal roof pitch.
What is the minimum pitch slope of an asphalt shingle roof.
For the most part the minimum pitch for metal roof installations depends on what kind of material you are installing and the method in which the material is being fastened.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.
That works out to about nine degrees if that works better for you.
