Figuring out how to measure roof square feet is usually the first big hurdle when you're planning a restoration or just attempting to get a fair quote from a contractor. A person don't need to be a math genius to get it right, but you do require to be a bit meticulous. In the event that you're off simply by a few 100 feet, you're either going to have a mountain of extra shingles taking upward space in your garage, or you'll be making an emergency run to the particular hardware store mid-project. Neither is a great way to spend a Weekend.
Before all of us get into the particular nitty-gritty, it's worthy of mentioning why this number matters so much. Everything in the roofing world revolves around surface area. Materials, labor costs, and even the time it takes to finish the job are all tied to that final square footage. Many pros will talk in "squares, " where one square equals 100 square feet. So, if you discover out your roof is 2, four hundred square feet, that's 24 squares.
The Ground-Level Estimate
If you aren't the fan of heights—and honestly, I don't blame you—you can get a pretty good ballpark figure without ever leaving the grass. This technique isn't 100% precise mainly because it doesn't are the cause of the steepness (or pitch) of the particular roof perfectly, but it gets you in the community.
Start by measuring the "footprint" of your house. Grab an extended video tape measure and stroll the perimeter. You're looking for the space and the breadth of the main dwelling space. In case your house is a simple rectangle, say thirty feet by 50 feet, your foundation area is 1, 500 square feet.
Yet here's the kicker: your roof isn't flat. It's got a slope, plus it likely hangs on the edges of the walls (those are your eaves). To get closer to the real number, you need to include the area of these overhangs. Usually, an additional couple of feet on each side does the technique. Once you have that "flat" square footage, you have to multiply this by a "pitch factor. "
Understanding the Pitch
The pitch of your own roof is just a fancy way of saying how steep it is. It's measured by how many inches it rises vertically for every twelve inches it runs horizontally. A "4/12" roof is quite standard—it's walkable and relatively easy to work on. A "12/12" roof is usually basically a cliff side.
To find your pitch without hiking up there, a person can use a level and also a leader from inside the particular attic. Place the particular end from the level against a rafter, make sure it's perfectly straight, then measure the range through the 12-inch tag for the level upward to the rafter. That's your increase.
Knowing the pitch, you utilize the multiplier. * Regarding a low frequency (like 3/12 or 4/12), multiply your base square video clip by 1. 05 or 1. 08. * For a medium pitch (6/12 or 8/12), you're taking a look at 1. twelve to 1. 20. * If you have a really steep roof (12/12), you may multiply simply by 1. 42 or even higher.
It sounds like a lots of extra work, but that slope adds a surprising quantity of surface area. In case you ignore this, you'll definitely under-buy your materials.
The Hands-On Approach
If you're comfortable on the ladder and your own roof isn't a vertical death snare, measuring the actual airplanes of the roof is the almost all accurate way to go. You'll desire a partner with this because holding a tape measure only while balancing upon shingles is a recipe for a bad day.
Break the particular roof into sections. Don't try to look at the particular event at once. Most roofs are just a collection of rectangles and triangles. 1. Rectangles/Squares: Measure the length and the particular width of every flat plane. Multiply them together. Easy. 2. Triangles: This usually occurs on gable ends or hips. Measure the base of the triangle (the bottom edge) and the particular height (from the particular base to the particular peak). Multiply the particular base by the particular height and after that divide by two. 3. Trapezoids: These pop up on hip roofs. A person measure the underside advantage, the top edge, and the height together. Average the two edges plus multiply with the height.
Write every single measurement down as you go. I've seen people try out to keep it all within their minds, only to forget which number belonged to which dormer by the time they climbed lower. Sketch a little bit of bird's-eye view map of your roof on an item of paper and write the quantities directly on the sections. It can make the last tally very much smoother.
Dealing with Dormers and Chimneys
Dormers—those little windows that stick out from the roof—are a little bit of a discomfort. They add personality to a home, but they also include extra surface area and more complex perspectives. You measure all of them just like a person would a mini-roof. Measure the edges and the front-facing slope, then include that to your own total.
As for chimneys and skylights, technically these people subtract a tiny bit of surface area since presently there are no shingles where the fireplace sits. However, many people just ignore all of them. The "missing" square footage from the chimney is usually so small that it's better to just include this in your overall as a basic safety margin. Plus, you'll need extra material for flashing close to those areas anyhow.
Don't Neglect the Waste Factor
This is actually the component where DIYers usually trip up. You can't purchase the particular exact amount associated with square footage you measured. You possess to are the cause of waste. When you're installing shingles, you're going to be cutting them to match valleys, ridges, and edges.
The standard guideline is to add 10% to 15% for waste materials . * If your roof is really a simple "up plus over" gable roof with no valleys, 10% is possibly fine. * In the event that you have a complex roof along with lots of sides, valleys, and dormers, you should definitely lean toward 15%.
It's far better to possess two bundles associated with shingles left more than that you can return to the store than to be three shingles short when the sunlight is going down and a rainstorm is rolling in.
Using Technologies as a Backup
If the math will be making your mind spin, there are plenty of applications and online tools that can assist. Some use satellite imagery to calculate the dimensions associated with your home. They will aren't always perfect—sometimes a big maple tree blocks the particular view of your roof—but they may be the great way to double-check your own manual measurements.
If your guide math says 2, 000 square feet but the satellite television app says 2, 800, you know you probably missed a section or messed up a multiplier somewhere.
Putting It Most Together
As soon as you've gathered most your measurements for each section, additional them up, applied the pitch multiplier (if you measured from the ground), and tacked on your waste percent, you finally have your number.
Knowing how to measure roof square feet gives you a huge advantage. When a contractor comes over to give you an estimate, a person already know exactly what the scope associated with the job appears like. If they try to tell a person that your 20-square roof is really 30 squares, you'll know something will be fishy.
It's about being prepared. Taking an hour or two to get these numbers right may save you 100s, if not thousands, associated with dollars in the long run. Simply remember: measure two times, stay safe upon the ladder, plus always, always purchase that extra bundle of shingles. You'll thank yourself later.