What does 4 on 12 slope for the roof mean?

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a “4 in 12” slope. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example, a “4 in 12” slope can be expressed as the ratio of 4:12. A “6 in 12” slope is expressed as 6:12.

How do you work out the pitch of a roof in degrees?

How to Calculate Roof Pitch in Degrees

1. First, you need to measure the run of your roof.
2. Next, you need to figure out the rise.
3. Now, divide the rise by the run.
4. Then, divide 1 by your tangent.
5. Finally, multiply this result by 180/π and you’ve calculated your roof pitch!

What is a 7 12 roof pitch?

For instance, a 7/12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Outside of the US, a degree angle is typically used. Roof pitch is a determining factor for cost of the roof, as well as the roof area, and the type of materials used.

What is a 4 pitch roof?

On blue prints architects & engineers usually display the pitch of a roof in the format shown on the image where number (4) represents a rise and number (12) represents a length. This means if a roof rises 4′ in the length of 12′, your Roof Pitch would be 4/12 or 18.43 degrees.

How do you calculate the angle of a roof?

Calculate the tangent of the roof angle by dividing the roof height by the roof width. For example, if the height is 7.5 feet and the width is 15 feet, the tangent of the roof angle is 0.5 because 7.5 divided by 15 equals 0.5.

What is the pitch of a roof?

Pitch Of Roof. The pitch of a roof is the term used to indicate the slope of the sides of the roof surface or the inclination of these sides with respect to a horizontal plane or a surface absolutely flat and parallel to the horizon.