Here are the equations you may use to solve for the length of the slope and the rafter.
Roof slope conversion chart.
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.
Given that roofs are normally spotted from a distance long before any windows and doors they will be a large determining factor as to what someone will think of when they look at your property.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
Then you ll be able to measure slope from an unfinished attic space under the roof.
Approximately 8 9 16 in 12.
First convert the pitch to a slope.
Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.
Rafter rise run this formula is from the pythagorean theorem.
For many home owners the roof is a hugely important feature of the home and is the key section of the home which is seen from the exterior.
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.
0 713 x 12 8 556.
Rise run rise run slope.
To do this simply convert the rise and run as a fraction to a decimal form eg.
Giving you a slope of 8 556 in 12 or.
Use the following formula which also describes a right triangle.
You can also calculate roof pitch even without using a roof slope calculator.