Most roof s have a pitch in the 4 12 to 9 12 range.
Sloped roof 2 per 12.
Simply put it s a shallow roof.
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.
A flat roof has a slope of 2 in 12 or less.
The run always remains constant at 12 inches.
That is the roof s rise.
Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor.
3 12 1 2 12 and 1 4 12.
Also if asphalt shingles are installed on a roof slope of 2 12 to 4 12 it shall be provided with a double underlayment application.
They have a pitch ranging from 4 12 to 9 12.
Clay and concrete tile.
For example if you measure 4 inches the pitch of your roof is 4 12.
Conventional roofs are the easiest to construct and you can walk on them safely.
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.
That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
If a roof rises 2 in a length of 12 this is 2 12 roof pitch.
You can also calculate roof pitch even without using a roof slope calculator.
A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.
These roofs have a pitch less than 4 12.
The most common slopes are.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Download the slope chart pdf.
High pitched roofs often need extra fasteners and their pitch can be as high as 21 12.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
Roof slope style.
Conventional slope roof range between 4 in 12 and 8 in 12.
There are two main categories of roofing.