Roof Shingle Formula

You can use the following equations to find the length of the rafter and the slope.

Roof shingle formula.

8 inches and you have an 8 in 12 pitch. Replacing an asphalt roof with new shingles will cost between 5 400 and 9 000 or an average of 7 211 for a 2 000 square foot home not including old roof removal. Simply enter your roof dimensions and roof type such as gable or hip and approximate roof pitch. Although ceramic tile roofs are expensive they can have a life span of over 100 years.

Divide the total footage by 100 to determine. Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry. 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.

Step 1 find the square footage of the roof. 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. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. For example a 4 12 pitch roof that is 100 square feet.

If your roof has dormers hips or other complex elements don t forget step 2 determine the total number of squares. 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. The pitch of the roof is the rise over a 12 inch run. Use our roof pitch calculator to find the pitch of your roof.

Our calculator will help you estimate the amount of roofing shingles needed for your project plus the cost of materials and accessories. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Roof pitch area multipliers. It is often compared to slope but is not exactly the same.

The actual cost will vary depending on whether it is a composite asphalt shingle roof or a fiber cement concrete composite shingle installation. 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. Formula roofing has worked hard to establish its excellent reputation as one of colorado s most trusted roofing institutions. 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.

Rafter rise run from the pythagorean theorem. If this distance measures 4 inches you have a 4 in 12 pitch.