How Do You Find The Angle Of A Roof Pitch

Roof pitch and corresponding angles.

How do you find the angle of a roof pitch.

Rafter height width from pythagoras remember that at school so. The angle of your roof is calculated the same way you d work the angle of a right angled triangle. Find all the needed factors in order to determine the pitch angle s degree. Before you calculate roof pitch you ll need to measure the slope of your roof.

Locate its tangent or tan and follow the left row for you to read its corresponding degree. Angle the angle of a roof is the same as the roof s slope except instead of being represented as x 12 it is represented in degrees. Enter any angle or fraction of angle to find pitch. The easiest way to do this is by accessing a rafter in your attic if you can.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. Pitch tan angle where angle is the roof pitch expressed in degrees. The traditional method has been rise inches 12 run inches. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

If it rises only 6 for every 12 it s a 6 12 pitch. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. To do this simply convert the rise and run as a fraction to a decimal form eg. After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof.

If you prefer to work the angle out the traditional way without our handy calculator you can use the following equations to find the length of the rafter and the slope. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. So use the 12 inch level as a constant run and 18 inch ruler as a variable rise. This is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.

This is useful because sometime you may need to cut a bevel with your circular saw that is not calibrated using roof pitch style this setting on circular saws is calibrated in degrees. If you want to find the roof pitch in the form of x 12 simply calculate the pitch and substitute 12 for the run length. 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. The 12 inch run is considered standard in roof pitch or angle terminologies.

Roof pitch refers to the slope which the rafter creates. Roof pitch is measured in a rise to run ratio with the vertical rise always shown first. If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. Rise run rise run slope.

The value displayed as the rise will be your x. First convert the pitch to a slope.