This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Roof pinch mulitiplier for square footage.
A 12 in 12 pitch is a steep 45 degree angle roof.
In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
800 multiplied by 1 16.
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.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
It is often compared to slope but is not exactly the same.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Enter your numbers into this go to roof pitch calculator.
Use our roof pitch calculator to find the pitch of your roof.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps.
Find the value of 7 12 from the roof slope multiplier table which is 1 16.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
The pitch of the roof is the rise over a 12 inch run.
Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.
Get your roof size by using this roof pitch calculator.
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.
The total run is the distance from the peak to the edge of the roof which in this case is the total width divided in half which is equal to 10 feet or 120 inches.
Multiply 20 and 40 which equals 800.
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.
Multiply step 1 and step 2 i e.
However shingles are packaged in a way that they are light enough for the average person to carry around.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
See the image below for more explanation on rise run and pitch.
The value arrived at 928 reflects the square feet of the roof.
Roof pitch area multipliers.
Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
The maths behind this number is that it is the square root of rise run 2 1.
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.
