If the area is 10 000 squares then roof pitch would be 12 500 10 000x1 25.
Roof area pitch factor.
What is the roof pitch factor.
A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof.
So keeping with our roof pitch of 4 this gives us 1 9.
This will give you the rise over run or pitch.
It is sometimes called the roof pitch multiplier.
Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about 1 0541.
Feet the area of a hip roof equals the area of a gable roof with the same dimensions.
For example if you measure 4 inches the pitch of your roof is 4 12.
You can calculate roof pitch from the rafter tail bottom or at a barge rafter at the gable end on the roof over hangs.
If you do not wish to climb on the roof to calculate roof pitch then use a ladder.
Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.
For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.
A 12 in 12 pitch is a steep 45 degree angle roof.
Then multiply the square footage with the roof pitch factor to get the total area of the roof.
How roof area is calculated.
The formula for the roof pitch multiplier comes from the formula for a right triangle and more specifically the pythagorean theorem.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
The maths behind this number is that it is the square root of rise run 2 1.
The procedure to follow is the same.
In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table.
This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.
A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.
It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches.
Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.
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.
Roof pitch affects the actual area of the roof.
Add 1 then take the square root.
