Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.
Slope factor for 6 12 roof.
Grades are the measure of percentage.
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.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.
Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.
One medium to describe the roof pitch is in 12 runs.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
Roof pitch 6 12 roof length including overhangs 40 gable wall length including overhangs 24 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.
See the image below for more explanation on rise run and pitch.
Divide the rise by the run the run is 12.
Roof pitch degree table.
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 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.
Outside of the u s a degree angle is typically used.
This will give you the rise over run or pitch.
For example if the pitch of the roof is 6 then it is written as 6 12.
We included a roof pitch chart below the 7 12 example image and the calculator below that.
As 6 is half of 12 it is considered to be 50.
This 6 12 roof pitch factor can also be described in other measures.
The angle for 6 12 is 26 57 and in grades it is described as 50.
A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.
A 12 in 12 pitch is a steep 45 degree angle roof.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
If this isn t practical then perform the same measurement on the underside of the roof.