Follow these steps for calculations you’ll use to learn how to measure for wood siding:
- Measure height and width of each side. For each side, multiply height times width to get the total square feet.
- Measure other areas not included in the sides, such as gables, dormers and more. For triangle areas, measure from the…
- Measure the height and width of each window, door…
What Is a Roofing Square?
In roofing, one square equals 10 X 10 ft., or 100 sq. ft. This unit of measurement determines how many shingles you’ll need for every 100 sq. ft. of rooftop. As you prepare for your roofing project, you’ll use squares to determine the amount of roofing materials you need, from asphalt shingles down to the underlayment.
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How to Calculate a Roofing Square
Before beginning, make sure you can safely access your roof—if you can’t, contact a roofing professional for help.
Grab your measuring tape, level, pen and paper, roof safety equipment, and your ladder. With these in hand, you can measure your roof in five simple steps.
- Determine the number of planes. Your roof is made up of planes. If you have a flat roof, it has one plane. If you have a simple gable roof, it has two planes. The more architectural details your roof has, the more planes you will have to measure.
- Measure each plane. Find the length and width of each plane. Then, multiply those two numbers together to find the square footage of that plane. For example, a 35 ft. X 36 ft. plane = 1260 sq. ft.
- Find the total of all the planes. Add the square footage for each roof plane into one total. 1,260 sq. ft. + 1,260 sq. ft. = 2,520 sq. ft.
- Divide to find the squares. To find how many squares are on your roof, divide the total square footage of all your planes by 100. In our example, the total was 25.2 squares — 2,520 sq. ft. divided by 100.
- Remember the roof slope. Roof slope indicates how steep your roof is and may increase the number of squares of materials you need. Roof slope is calculated by determining how many inches a roof rises vertically for every 12 inches it extends horizontally. For example, if that vertical rise is 4 inches, the slope is 4:12.
You can use an online shingle calculator or roof slope calculator to help run the calculations. Once you know the total number of squares you want to cover, consider adding up to 10% in overage to account for error and installation.
STEP-BY-STEP GUIDE: HOW TO MEASURE A ROOF FOR METAL ROOFING INSTALLATION
It’s important to measure your metal roof before you begin your project so that you can estimate your metal roofing material as accurately as possible. Here’s our step-by-step guide for measuring the total roof area for installation:
Step 1: Start by sketching out a top-down view of your home’s roof. Don’t worry about getting the scale or dimensions perfect yet.
Step 2: Measure the length of your roof. Do this by measuring from one of the edges to the opposite side. Write down the number for the next step.
Step 3: Next, figure out the width of the metal that you’re installing. Then, divide the length of your roof by the width of the metal. For example, your roof’s length might be 30 linear feet (360 inches). Divide that by 24-inch standing seam roofing, and you get 15. This will be the number of panels you’ll need for one side of the roof.
Step 4: Repeat Step 3 for the other side of the roof. It’s important to measure both sides in case they slightly differ in size.
Step 5: Measure from the fascia board (board attached to the roof joists) to the ridge (peak) of the roof. This will determine the length of the metal roofing panels you’ll need for one side of the roof.