Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
Roofing square footage multiplier.
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.
So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having.
The number you get will be an accurate estimate of how much area you have to cover for your roofing project.
For example a 4 12 pitch roof that is 100 square feet.
Roof surfaces are measured in squares a square is an area of roof which measures 100 square feet.
Multiply by the square footage of a single floor of your house.
If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps.
Determine how many square feet of roof area a building has by measuring blueprints or plans.
Multiply step 1 and step 2 i e.
This roof pitch chart will give you your multiplier.
100 1 054 105 4ft 2.
If your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width.
The average roof is 3 000 square feet or around 30 squares.
If you know the pitch of a roof you can use the numbers in the following pitch table to do the following.
A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by.
First multiply the length by the width.
Determine how many square feet of roof area a building has by measuring from the ground.
To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
For the total square footage of the roof.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
Multiply 20 and 40 which equals 800.
Multiply the area by the pitch multiplier to get the roof s square footage.
Then take the product of these two dimensions and multiply it by your pitch multiplier.
It is often compared to slope but is not exactly the same.
Find the value of 7 12 from the roof slope multiplier table which is 1 16.
800 multiplied by 1 16.
