Hello guys, welcome back to my blog. So today I want to answer a question a lot of you guys keep asking me, what is a square in roofing. It sound like a small thing, but if you don’t understand it, you can end up confuse when a roofer gives you a quote. So let me break it down for you in easy words, with real facts and even what actual roofers are saying about it on Reddit.
So What Is A Square In Roofing, Really
A square in roofing is just a unit of measurement. One square equal 100 square feet of roof area. That’s it, nothing complicated. Roofers use this unit instead of regular square feet because it make the math easier when you are ordering material and giving price for a big roof.
As per GAF, a roofing square is “an area of roof that measures 10 by 10 feet to make up a total of 100 square ft.” So if you imagine a 10 foot by 10 foot box on your roof, that box is one square. A roof that is 2,500 square feet in total comes out to 25 squares. Simple divide by 100 and you get your answer.
How Roofers Calculate Roof Squares
This part I found interesting when I was reading discussion on r/Roofing. Nowadays most roofer don’t climb up and measure with tape anymore for a estimate. One commenter said, “Order an eagle view or GAF quick measure for like $30.” These are satellite based measuring tool that give a full report of your roof, including square footage and how much material get wasted.
If you want to do it the old school way, another roofer on r/Roofing explained it simple too, saying “measure the perimeter from the ground, get a pitch app to get the pitch, use geometry.” I think this method work fine for a simple roof shape, but for anything with lots of valleys or angles, I would honestly just pay for the satellite report. It save time and mistake.
According to GAF, the actual steps are pretty easy once you have your measurements:
- Measure the length and width of every roof plane
- Multiply length by width to get square footage for each plane
- Add up all the plane measurement together
- Divide the total by 100 to get your number of squares
Why The Number Of Squares Ordered Is Higher Than Your Actual Roof
Here is something that confuse a lot of homeowner. Your roofer might tell you the material order is more squares then what your actual roof measures out to. This is normal and not them trying to overcharge you.
A roofer explaining this on r/Roofing told someone, “your roof is 30 squares, the extra is for waste as you said you understand.” The extra material account for cuts around edges, starter course, and the ridge and hip caps. My honest opinion, always ask your roofer to explain the waste percentage so you are not surprise later.
How Many Shingle Bundles Make One Square
Now this is good to know before you go buy material or even just to understand your quote better. As per IKO, most standard shingles need three bundles to cover one square of roof, but heavier specialty shingle like their Armourshake product need five bundles per square. This is because a full 100 square foot bundle would just be too heavy for one person to carry, so manufacturer split it up.
| Shingle Type | Bundles Needed Per Square |
|---|---|
| Standard 3-tab or architectural | 3 bundles |
| Some premium designer shingles | 3 bundles + extra pieces |
| Heavy specialty shingles (like Armourshake) | 5 bundles |
Source: IKO
I think it’s smart to always check the coverage number printed on the bundle wrapper too, because it can be a little different brand to brand.
Cost Per Square For Different Roofing Material
This is probably the number one thing you guys actually want to know. The cost per square change a lot depending on material, and honestly it can shock you how big the range is.
| Material | Cost Per Sq. Ft. |
|---|---|
| Asphalt 3-tab | $0.70–$2 |
| Asphalt architectural | $1–$3 |
| Asphalt luxury | $1.50–$4 |
| Steel | $4–$7 |
| Aluminum | $3–$6 |
| Wood shakes/shingles | $4–$6 |
| Slate | $8–$18 |
| Solar shingles | $20–$26 |
Source: Angi
Just multiply these number by 100 and you get roughly the cost per square. So a basic asphalt roof could be around $70 to $200 per square, while something like slate can go up to $1,800 per square. Big difference, so this is why material choice matter so much for your budget.
Redditors also talk about pricing tricks in the industry. On r/Roofing, one commenter mentioned a “roofing sales guy said they are passing on the $3,000 in credits that they get from GAF selling the warranties.” I think this is a good reminder to always ask your contractor to break down exactly what you are paying for per square, and not just accept one big lump number.
Metal shingle system also cost quite a bit more then basic asphalt. A roofer on r/Roofing explained that “standing seam is usually around 2 to 2.5 times the cost of shingles, and higher end system like metal shingles or stone coated steel can be closer to 3 to 3.5 times.” So if a metal quote look expensive compare to your neighbor’s asphalt roof, this is probably why.
What Else Changes Your Cost Per Square
It’s not just material that decide your price. According to This Old House, roof pitch, height, and how complex the design is (things like valleys and penetrations) all push the labor cost up. A steep or tricky roof simply take more time and more safety gear, so it cost more per square than a simple flat pitch roof.
A roofer on r/Roofing said it in one simple line, “an estimate is based off square, materials used, and labor, so a 4/12 roof will be cheaper than an 8/12.” I think that’s a good rule of thumb to remember when you compare quotes from different roofer.
How Fast Can A Crew Install A Square
Something I always found impressive is how fast a experienced roofing crew can move. On r/Roofing, one commenter said it’s “totally normal for a big crew of people, once they get into a groove they absolutely fly.” A skilled crew can knock out many squares in a single day if the weather and roof shape allow it.
Part of the reason is how roofers get paid. Another comment on r/Roofing explained “that’s piece work, the more they do the more they get paid, it’s called incentive.” So the faster they finish squares, more money they make, which push the speed up a lot.
But don’t think this job is easy just because it’s fast. One roofer described their old work pace honestly on r/Roofing, saying “back when I had to play dumb roofer I would not pick my head up until my gun ran out of nails, helper would toss shingles directly into my hands.” That is a lot of physical work, so next time you see roofer moving fast, remember it’s a really tough job on the body.
Quick Facts Table
I always like to add a small table so you guys can scan the key points fast without reading everything again.
| Fact | Detail |
|---|---|
| 1 roofing square equals | 100 square feet |
| Standard shingle bundles per square | 3 bundles |
| Heavy specialty shingle bundles per square | 5 bundles |
| Basic asphalt cost per square (rough) | $70–$200 |
| Slate cost per square (rough) | $800–$1,800 |
| Common measuring tools | Eagle View, GAF QuickMeasure, pitch app |
| What affects cost per square | Material, pitch, height, roof complexity |
Frequently Asked Questions
Q: What is a square in roofing? A: A square in roofing is a unit equal to 100 square feet of roof area. Roofers use it to measure and price roofs instead of regular square footage.
Q: How do I know how many squares my roof is? A: You can get a satellite measurement report like Eagle View or GAF QuickMeasure, or measure your roof’s perimeter and pitch manually and use geometry.
Q: Why does my roofer order more squares than my roof size? A: This extra is for waste, like cuts around edges, starter shingles, and ridge or hip caps. It’s normal and expected in almost every roofing job.
Q: How many bundles of shingles are in one square? A: Most standard shingles need 3 bundles per square, but some heavier specialty shingles can need up to 5 bundles per square.
Q: Does cost per square change by material? A: Yes, a lot. Basic asphalt can cost around $70–$200 per square, while premium material like slate or solar shingles can go way higher.
Final Words
So guys, this was my simple breakdown on what is a square in roofing, how it get calculated, how many bundles you need, and what change the cost per square. I have tried to cover it with real facts and also what actual roofers are saying on Reddit, so you get the honest picture. Keep on visiting Write for Us Roofing for more roofing guides like this.
Sources
- GAF – What Is a Roofing Square
- IKO – How Many Shingles Are in a Bundle
- Angi – How Much Does a Shingle Roof Cost
- This Old House – How Much Does a Shingle Roof Cost
- r/Roofing – Measuring tools discussion (Reddit)
- r/Roofing – Manual measuring method (Reddit)
- r/Roofing – Waste factor explanation (Reddit)
- r/Roofing – Pitch vs cost discussion (Reddit)
- r/Roofing – Warranty credits discussion (Reddit)
- r/Roofing – Metal shingle cost comparison (Reddit)
- r/Roofing – Crew speed discussion (Reddit)
- r/Roofing – Piece work incentive discussion (Reddit)
- r/Roofing – Physical demands of roofing (Reddit)