![]() ![]() Be sure to add 10%-15% to all your material totals for trim allowance (waste factor). This means you would need 24 squares of shingles to cover that roof. To determine the number of squares on the gable roof example in this post, divide its total of 2400 square feet by 100 (2400 ÷ 100 = 24). What is a “Roofing Square”?Ī roofing square is equal to 100 square feet of the roof. ![]() Ready to get an estimate? Find an independent roofing contractor in the Owens Corning Roofing Contractor Network near you. for the total square footage of the roof. Multiply length (A) times width (B) and length (A) times width (C) to get the square footage for each plane.So to derive the total square footage of the roof, you would: for the total square footage of the roof.Įxample #2: Gable Roof with Two Roof Planes Shed Roof with One Roof PlaneĪ x B = 40′ x 30′ = 1200 sq. Add the square footage of each of the planes together.Įxample #1: Shed Roof with One Roof Planeįor example, this shed roof has one roof plane. ![]() Measure the length and width of each plane on the roof (including dormers) then multiply length times width. ![]() To find your roof’s total square footage: How to Calculate Total Square Footage of Your Roof To estimate how much roofing material you need, such as bundles of architectural shingles or rolls of synthetic roofing underlayment, you need to know the total square footage of your roof’s surface. Roofing Suppliers – Where to Buy Roofing Materials.If you have decided to do the work on your own, check out our estimating guidelines below and these other Roofing resources: Estimating How Much Roofing Material You Need Search our list of independent roofing contractors in the Owens Corning Roofing Contractor Network to find the roofing professional that’s right for you. Since you cannot afford mistakes during installation, we highly recommend you hire a professional roofing contractor. A successful re-roofing project requires a large investment in both time and money. Your roof is a major structural component of your home. ![]()
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