Simple Method For Measuring Roofing Squares
When homeowners plan a roofing project, they need to become familiar with specific industry terms. One is a "roofing square," which roofers use to calculate the material required to complete the job. We've prepared this guide to help you measure the square footage of your roof, figure out what a roofing square is, and learn how to calculate roof square footage.
What Is a Roofing Square?
A roofing square is a unit of measurement used to calculate the area of a roof. When contacting a professional roofer, the number of squares on your roof replacement project can help you get an accurate estimation of what the cost of your project will be.
How to Calculate Roof Square Footage
To calculate roofing squares, you must determine your roof's total area. The roof's square footage will differ from the house's square footage because nearly 100% of roofs are built at an angle, while foundations are flat surfaces.
To measure a roof footprint, you should measure its overall dimensions. You will need to gauge the length and width of each part and then multiply those numbers to determine the square footage. Once you have that figure, you can calculate roofing square footage.
Safety is a Top Priority!
When working on the roof, ensure you wear shoes with grippy soles, and avoid wearing clothes with loose or dangling material. Never leave your ladder unattended, and ensure it is always adequately secured.
Also, never go up on the roof for measurements when your roof is wet. The surface of a wet roof can become dangerously slippery, especially if it is old and covered with debris.
Roof Measurement Tools
Small roofs can be measured using a tape measure; larger roofs may require a measuring wheel. If your roof is inaccessible, you may use satellite software such as iRoofing or EagleView.
How To Measure Your Roof
We will use Rox Roofing's excellent video to demonstrate how to calculate roof square footage.
To calculate the roof area, follow these steps:
- As demonstrated in the video, sketch your roof.
- Determine the dimensions of any chimneys in your home (if applicable). In our example, we have a 40' x 40 chimney. Since it is not a large area, we will not deduct it from the total square footage of the roof. However, if the chimney was larger (e.g., 160 sq ft), we would remove it from our calculation.
- Then we'll measure each roof side from the eave to the ridge. In our example, it's 22 feet.
- Then we'll measure the length of a ridge from one edge down to another. In our example, it's 34 feet. We'll repeat for each part of the roof.
- Now let's calculate the roof's total square footage by multiplying each part's length by width.
We will multiply 22' x 34', giving us 748 sq ft. Finally, we’ll just round that up to 750 square feet for both areas.
This area is 18 feet by 10 feet, which gives us 180 square feet. This roof has four separate areas that we measured individually.
To determine the total square footage of this roof, we must add all these areas together. The total square footage of this roof will be 180 + 180 + 750 + 750 = 1860 sq ft. To double-check our calculation, we'll run these numbers twice, just in case. And that's how to calculate roof square footage. Pretty simple, isn't it?
What Is a Square in Roofing? How to Calculate Roofing Squares
Once we have measured the roof and determined the square footage, it is time to convert this number into roofing squares. So what is a square in roofing? Here is the simple formula: 100 sqft = 1 roofing square.
So, all you need is to divide the total square footage of your roof by 100. In this case, it's going to be 18.60 roofing squares. 1860 divided by 100 gives us 18.6 roofing squares.
How Many Roofing Squares Are in 1200 & 2000 Square Feet Roofs?
We'll give you two more examples of the most common roof sizes in the US to ensure we've covered all our bases.
For example, if your roof has 1200 square feet of surface area, you have 12 roofing squares. If it has a surface area of 2000 square feet, you will have 20 roofing squares.
The number of roofing squares will help you and a contractor estimate your roofing project.
How Many Roofing Squares Do You Need?
When calculating the materials needed for a roofing project, adding 10-15 percent to your total squares is customary. So, if we have 18.6 roofing squares, we'll multiply that number by 1.15 to ensure we have enough materials.
Get a Written Estimate
After determining how many roofing squares you'll need and giving this number to a roofer, you can get a written estimation. They will still need to figure out all the hips, ridges, starter strips, and everything else. But knowing how many roofing squares you'll need and having a sketch like in the example from Rox Roofing, you can be sure that you'll get a more accurate estimation.
Note that it won't be the final estimation. A roofer needs to inspect your roof, ventilation system, shingle layers, accessibility of the roof, and other factors before giving you an estimate for replacing your roof. To learn more about the cost of a new roof and what can drive the price up, read our article "What Is the Average Price to Replace a Roof in 2024?".
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