How many square feet does a square of shingles cover?
100 square feet
If the shingles you are using come three bundles to a square, calculating the number of bundles you'll need is simple. Each bundle covers 33.3 sq. ft. of roof area—close enough to the 32 sq. ft. a sheet covers.
- An average roof size is about 30 squares so (3,000 ÷ 100 = 30). This means you would need 30 squares of shingles to replace that roof. The most common type of shingle, called a three-tab or strip shingle, is generally packaged three bundles per square so you would need about 90 bundles.
- To estimate how many shingles you'll need, first estimate the total square footage of your roof's surface. To do this, measure the length and width of each plane on the roof, including dormers. Then, multiply length x width to get the square footage of each plane.
- The slope of your roof is the ratio of vertical distance (rise) to horizontal distance (run). Just write down the measurements you found. There's no need to simplify them. For example, if you find 4 inches of height with the tape measure at the 12 inch mark on the level, your slope is 4:12 or "4 in 12."
To determine the number of squares on the gable roof above, divide its total of 24,000 square feet by 100 (24,000 ÷ 100 = 240). This means you would need 240 squares of shingles to cover that roof. The most common type of shingle, called a three-tab or strip shingle, is generally packaged three bundles per square.
- Assume you have a rectangular area such as a room and, for example, you want to calculate the square footage area for flooring or carpet. The way to calculate a rectangular area is by measuring the length and width of your area then multiplying those two numbers together to get the area in feet squared (ft2).
- The vast majority of roof shingle bundles weigh between 50 and 80 lbs. Architectural style shingles generally weigh 65 to 80 lbs. per bundle, while 3 tab shingles weigh 50 to 65 lbs. per bundle.
- It's a component of the Owens Corning™ Total Protection Roofing System™^. 1. Starter Strip is packaged two pieces per shingle, 16 shingles per bundle, 105 lineal feet.
Find the square footage of the roof. 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. Determine the total number of squares. Divide the total footage by 100 to determine the number of “squares” in the roof.
- Nail Quantity per Square. Shingle manufacturers recommend using four nails per shingle in the main part of the roof and five nails per shingle in the first row. This amounts to an average of 320 nails per square, or 100 square feet. In high-wind areas, you need five nails per shingle, or 480 nails per square.
- Straight to the answer
- Divide your roof pitch by 12. Roof pitch is given as the number of inches in height change over the distance of one foot.
- Square the result of Step 1.
- Add 1, then take the square root.
- Multiply by the square footage of a single floor of your house.
- Things You Will Need.
- References (1)
- A bundle of asphalt shingles weighs between 60 and 80 pounds, but this may vary depending on the quality and type of shingle. Generally, three bundles of shingles are enough to cover 1 square of roof (100 square feet), which typically weighs 250 pounds.
Updated: 21st October 2019