Metal roofs will have the highest wind blow off resistance and are best suited for ice dams prevention especially if your roof slope is below 6 12.
Roof 3 over 12.
If your roof slope is above 3 12 so called steep slope you can install either asphalt shingles or a metal roof or one of the exotic roof types.
If a roof rises 3 in a length of 12 this is 3 12 roof pitch.
3 12 roof pitch angle 14 04 degrees.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Roof pitch is represented in inches rise of 12 inches run.
Metal roof panels with lap sealant.
Pitch rise run 1 5 6 25.
For example a 3 pitch or 3 in 12 pitch or 3 12 pitch all mean that the roof rises 3 inches for every 12 inches of it s horizontal run.
Recalculate this value into an angle.
In 12 0 5 in 12 2 39 metal.
Metal roof tiles metal roof shingles interlocking 3 in 12.
X pitch 12 0 25 12 3.
Metal roof panels non soldered no lap sealant.
Angle arctan pitch arctan 0 25 14.
Roof pitch degree table.
Slate tile wood etc.
The pitch of your roof is 3 12.
A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.
Finally you can find the roof pitch in the form of x 12.
The flat roofing materials most appropriate to these shallow sloped roofs include.
25 12 to 3 12 roof pitches.
Most roof s have a pitch in the 4 12 to 9 12 range.
Roof pitches with lower angles such as 1 12 up to 3 12 are found in more urban contemporary style houses and in industrial buildings and shacks.