Multiply the roof length by the gable wall length 40 24 960.
Roof slope conversion factor.
The roof slope factor chart also consists of conversion factors to determine the slope of the roof.
In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by the rafter.
Degrees to roof pitch rise in run to see a table.
Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format.
The area of this roof 1073 3 sq.
It s just a little math.
Rafter rise run this formula is from the pythagorean theorem.
Multiply this amount by the slope factor 960 1 1180 1073 28.
The roof pitch factor is also used to calculate the length of common rafters.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.
For example if you measure 4 inches the pitch of your roof is 4 12.
Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10.
The area of a hip roof equals the area of a gable roof with the same dimensions.
This will give you the rise over run or pitch.
Use the following formula which also describes a right triangle.
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.
Charts list the slope factor for various pitches usually from 1 12 to 12 12.
In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be.
A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12.
A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run.
You can also calculate roof pitch even without using a roof slope calculator.
The headache of using pythagoras and trigonometry can be spared by making use of these charts.
See below after the table for directions on how to convert any roof slope from one form to another even roof slopes not shown in the table.
Also see our page quick reference.
The combination of two numbers are used to display or show the roof pitch.
You could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts.
The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages.
The slope of the roof provides the rise and the run to be plugged into the equation.
