In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area.
Roof square footage multiplier.
The pitch of the roof is the rise over a 12 inch run.
If your roof measures 48 feet 15 m x 24 feet 7 3 m multiplying its length by its width would give you a square footage of 1 152 square feet 107 0 m 2.
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 example a 4 12 pitch roof that is 100 square feet.
How to find your what roof pitch category.
100 1 054 105 4ft 2.
Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof with the same slope.
Roof pitches in.
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.
This roof pitch table displays a multiplier for adding for different roof pitches.
The calculator cannot account for complex shapes based on a measurement of square footage alone.
Use our roof pitch calculator to find the pitch of your roof.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
If its pitch is 6 in 12 a pitch multiplier of 1 12 multiplying 1 152 sq ft 107 0 m 2 by 1 12 would give you an overall square footage of 1 290 square feet 120 m 2.
Roof pitch how much to add.
However shingles are packaged in a way that they are light enough for the average person to carry around.
Multiply step 1 and step 2 i e.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
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.
Determine how many square feet of roof area a building has by measuring from the ground.
As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house.
This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.
The value arrived at 928 reflects the square feet of the roof.
So in this case for every 12 inches the roof goes across horizontally b while rising 6 inches a there s actually 13 416 inches of roof c.
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 1 350 square feet multiply 1 350 by 1 0541 to get 1 423 square.
Find the value of 7 12 from the roof slope multiplier table which is 1 16.
800 multiplied by 1 16.
Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
