Roofing Square Footage Multiplier

It is often compared to slope but is not exactly the same.

Roofing square footage multiplier.

Find the value of 7 12 from the roof slope multiplier table which is 1 16. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Multiply by the square footage of a single floor of your house. Plane 1 plane 2 24 000 sq.

800 multiplied by 1 16. First multiply the length by the width. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. If you know the pitch of a roof you can use the numbers in the following pitch table to do the following.

Roof surfaces are measured in squares a square is an area of roof which measures 100 square feet. Multiply the area by the pitch multiplier to get the roof s square footage. The average roof is 3 000 square feet or around 30 squares. To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.

For example a 4 12 pitch roof that is 100 square feet. For the total square footage of the roof. 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. Multiply 20 and 40 which equals 800.

Roofing material is estimated by the square which is equal to 100 square feet. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Determine how many square feet of roof area a building has by measuring blueprints or plans. Then take the product of these two dimensions and multiply it by your pitch multiplier.

Multiply step 1 and step 2 i e. 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. Many homes have an asphalt shingle roof but some have wood metal tile and slate which can be more expensive. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

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. 100 1 054 105 4ft 2. This roof pitch chart will give you your multiplier.