For example a 4 12 pitch roof that is 100 square feet.
Roof shingle formula.
Rafter rise run from the pythagorean theorem.
You can use the following equations to find the length of the rafter and the slope.
Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.
Divide the total footage by 100 to determine.
Note that in the last 3 4 years costs of roof shingles and many accessories have gone down by an average of 18 20 currently the us national average for benchmark architectural shingles is around 74 51 square or 25 per bundle.
Step 1 find the square footage of the roof.
Although ceramic tile roofs are expensive they can have a life span of over 100 years.
The pitch of the roof is the rise over a 12 inch run.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
8 inches and you have an 8 in 12 pitch.
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If this distance measures 4 inches you have a 4 in 12 pitch.
It is often compared to slope but is not exactly the same.
On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.
Simply enter your roof dimensions and roof type such as gable or hip and approximate roof pitch.
Roof pitch area multipliers.
Generally roof pitch is calculated from the same formula that describes a right triangle.
If your roof has dormers hips or other complex elements don t forget step 2 determine the total number of squares.
The best part of a roofing calculator is that it offers a free insight into the total cost of the replacement roof project on a sq ft basis.
100 1 054 105 4ft 2.
Our calculator will help you estimate the amount of roofing shingles needed for your project plus the cost of materials and accessories.
Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years.
Measure the length and width of each portion of the roof multiply length by width for each plane and then add the planes together for the total square footage 1 x research source if you have a simple gable roof you ll only need to measure and sum up the 2 planes of the roof.
As you begin to calculate various costs you will see that the cost is a result of the interplay of many different variables including roof area in terms of footage measurement of any roof extras like chimneys or skylights and the dimensions of.
Use our roof pitch calculator to find the pitch of your roof.
