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# How To Figure Shingles For A Roof

## How Many Bundles Of Shingles Will You Need

How to measure a roof for shingles

The average bundle of shingles covers 33.3 ft2, so three bundles of shingles are needed per square. Asphalt shingles range in price from about \$25 per bundle for a standard 3-tab style to around \$50-\$75 or more for an upgraded architectural style.

Since transportation is a major cost factor, expect prices to vary by location. A typical bundle of shingles weighs about 75 pounds, while some premium products can weigh over 100 pounds per bundle, so consider delivery of materials.

## Calculate The Square Footage Of Your Roof

Now that you thought about the slope and complexity of your roof, youre ready to learn how to calculate the square footage of your roof.

To get a rough estimate for your roofs square footage, youll use this equation:

For example, if you have an easy up and over, walkable gable roof and a house that measures 56 feet lengthwise and 28 feet widthwise, your calculation will look like this:

1,568′ =

x 1.3

2,038 = square feet of roof area

Using this equation wont be 100% accurate, but knowing your roofs square footage is a great jumping-off point to learn how much youll have to invest in your replacement.

## Which Should I Use To Re

Asphalt, wood or slate are the preferred material for steep rooftops. However, when re-shingling a hip/steep one, consider the type of shingles that were used previously. Using a material of comparable weight and quality can help ensure that the structure is designed to support the new weight. If heavier ones must be used, then the home may need to be reinforced before the project can proceed.

## What Is A Square In Roofing

A roofing square is the amount of roofing material required to cover 100 square feet of roof. When calculating the number of shingles you need to cover your roof, youll calculate the area in terms of squares. Therefore if you have 2100 square feet of roof, youll need 21 squares of roof material.

A square of shingles is the number of shingles needed to cover a square of roofing. Whereas a bundle of shingles can vary in square footage, a square of shingles is always 100 square feet. This makes it easier when purchasing roofing materials since manufacturers will package 3 or 4 bundles of shingles to add to an even square.

A square in roofing is always 100 square feet. This refers to the square footage on the roof surface. It doesnt necessarily have to be a perfect square and is a quick way to calculate the quantity of roofing material that youll need for your job.

Youll always need more shingles than youd think to cover a square of roofing. Even if a shingle is 12 wide, some of that is covered by the shingle on top of it. Therefore, only about 6 to 8 of each shingle is showing. Thus, for standard 3-tab shingles, you may end up with 80 or more shingles in one square of roofing.

## Calculating The Area Of A Complex Roof

Areas of complex roofs with multiple hips and valleys take the most time to calculate. Start by making a rough sketch of the roof. To simplify the calculation, break down the sketch into rectangles and right triangles , then take as many measurements of the roof as you can to match the sides of the rectangles and triangles on the sketch.

Use visual cues from the existing roof shingles or roof sheathing to determine square lines off eaves edges or ridges. These cues will help you measure the lengths of the sides of the rectangles and triangles. For instance, the cutout slots on shingled roofs run perpendicular to the eaves, and nail rows in sheathing are pretty close to square also. It is difficult sometimes to get accurate measurements. Dont get too concerned though just round lengths to the nearest 6 in.

With the sketch filled in with measurements, you can determine the size of the roof area. The area of a rectangle is length multiplied by width, whereas the area of a right triangle is the length of the two sides that meet at the 90-degree corner multiplied together and divided by two .

Tally the square footages of all the rectangles and triangles, which will give you the total square footage for the roof. The example here shows the calculation for a roof with two hips.

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## Roof Replacement Vs Repair

Here are some telling signs that an asphalt shingles roof need to be replaced:

Many shingles are noticeably buckling or curling- A significant number of shingles is missing Many shingles are missing in the area of the roof valley Numerous shingles have large visible cracks- There is visible shingle discoloration as well as dark streaks on many areas of the roof. Overall, it looks very old and ugly.

PRO TIP:

## How To Estimate Roofing Materials

This article was co-authored by David Bitan. David Bitan is a roofing professional, licensed contractor, and the owner and founder of Bumble Roofing based in Southern California. With over 12 years of construction industry experience, David specializes in restoring, repairing, and maintaining residential, commercial, and industrial roofs. With over 60 years of combined experience, Bumble Roofing provides easy, friendly services to structures including residential, commercial, industrial, multi-family, and government buildings along with hospitals, hotels, and churches. This article has been viewed 697,513 times.

Knowing how to estimate roofing materials is important. Not only will it help eliminate waste, but it will also ensure that you buy just enough for the roofing job. Youll have to calculate your roof area, or the overall size of your roof, to determine the amount of materials youll need. This wikiHow will show you how to estimate roofing materials for your next project.

## Hip And Ridge Cap Roofing Shingles

A bundle of hip and ridge cap roofing shingles has between 20 and 24 shingles. GAF hip and ridge shingles have 30 pieces per bundle. Owens Corning hip and ridge shingles have 24 shingles per bundle.

Owens Corning hip and ridge shingles come as a 36×12 3-tab shingle, with pre-cut perforations that allow you to tear off each hip and ridge shingle. So one shingle is 3 hip and ridge shingles. They sell packs of 24 shingles, but each shingle contains 3 hip ridge shingles, so you get 72 in all. This will cover 33 linear feet of your hip or ridge.

GAF hip and ridge shingles are 12 x 12, and it takes 30 of them to make 20 linear feet. If you use them to make hip joints to your peaks, then the linear length may be less as youll use more shingles to bridge the peak to hip transition.

## Finding The Total Roof Area

How to measure a roof for shingles

Once the area of the roofs footprint is known, the overall roof area can be found by accounting for the roofs pitch. The pitch of the roof is the rise over a 12-inch run. Use our roof pitch calculator to find the pitch of your roof.

Next, multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.For example, a 4/12 pitch roof that is 100 square feet:

100 × 1.054 = 105.4ft2

#### Roof Pitch Area Multipliers

Multipliers for common roof pitches that can be used to find the total area of a roof.

Pitch

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## What Depth Of Gravel Do I Need

You would usually lay a 10mm aggregate at a depth of 30-40mm, but on a driveway this would need to be at least 50mm. A 20mm aggregate would need to be at least 40-50mm deep, and at least 50-60mm on driveways. A larger aggregate will settle and bond together better than smaller ones. The depth you will need to select for your gravel or slate will always depend on the aggregate size and what the surface will be used for.

## What Are Roof Shingles

Roofing shingles are watertight and wind-resistant seals that protect the roof from environmental damage. They are individual roof coverings that overlap one another when placed on the roof.

Many shingle installations are placed on top of an underlayment material such as asphalt felt paper which prevents leaks from rain and snow. In addition to having a variety of styles, colors, and textures, roofing shingles vary in price. On average, most homeowners pay between \$8,000 and \$9,000 for shingle installation.

Depending on the location, the availability of design varies per state. The type of shingle is considered before construction because the roof pitch and construction method varies. You can choose almost any kind of shingle to match your homes roofing design and increase the aesthetic of your home.

Read Also: How Much Does It Cost To Shingle A Roof

## How Many Shingles Do I Need For 2000 Square Feet

The number of packs or squares required will depend on your roof area or slope. For example, a 2000 square foot roof would require 20 squares or 60 packs. The roofing professional will likely purchase more materials than necessary to get additional materials if needed. Account for about 5-10% overage on your project to ensure you have enough material if measurements are a little off or material is wasted or damaged.

## What Else Impacts The Cost Of Your New Roof

Now you know how to roughly calculate your roofs square footage and 3 more factors that impact the cost. Remember, the only way to get a 100 percent accurate measurement is to have a local roofing contractor come out to professionally measure your roof.

Knowing your square footage and the 3 other cost factors lays the groundwork for learning the size of your roof investment. However, there are even more factors that impact the cost of your new roof besides whats listed in this article.

To understand where your hard-earned money is going when you invest in a new roof, we broke down the 9 factors that affect the cost of your new roof.

The team at Bill Ragan Roofing has provided high-quality roofing services in the Nashville area since 1990. We give you an experience rare in the roofing industry with our workmanship and customer service.Thats why were proud to offer you a lifetime warranty.

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## Plan For Extra Valley Material

Valleys are either woven or cut both methods require about the same number of shingles. On a woven valley, each course of shingles is extended beyond the valley crease and at least 12 in. onto the adjacent roof plane. Youll use 2 ft. of extra shingle material for each pair of woven courses. In the case of cut valleys, the shingles from the first roof plane thats shingled also extend onto the adjacent roof plane at least 12 in. just like woven valleys. Shingles from the next roof plane are cut just up from the valley line, and the cutoff pieces usually arent big enough to use elsewhere on the roof. Order two extra shingles per linear foot of valley to account for the overlaps and cutoffs. On a 16-ft. valley, you would need 32 shingles or roughly one extra bundle.

## S To Calculate Your Roofs Square Footage

You just learned what a roofing square is. The number of roof squares has a huge impact on the cost factors, such as the amount of materials used, labor, and time.

Before investing in a new roof, wouldnt it be great to know how much itll cost per square?

If you answered yes, we have a great way to roughly calculate your roofs square footage to give you an idea of the cost of your new roof. Be aware, the only way to get a 100 percent accurate measurement is to have a local roofing contractor come out to professionally measure your roof.

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## How To Measure Your Roof Area From The Ground

A more accurate way to calculate the area of the roof than using Google Earth is to get outside to estimate the roof pitch and the base area of the property. Using these two figures, we can get a good idea of the shingle roofs square footage and estimate your asphalt shingles needs and costs. This DIY technique can be helpful, especially if you are not comfortable getting on your roof, or if you have limited access to it.

Ground measures only work well for a gabled roof, since there are usually just two main rectangular pitches to calculate area for. For more complex roof shapes, like hip roofs, youll need to work with a roofer or measure from on top of the roof itself to calculate its total area.

## How Many Shingles In A Square

How To Calculate Roofing Shingles including Hip Roofs by PawPaw

For regular 3-tab, non-laminated shingles, youll have around 78 shingles per square. Some older styles of 3-tab shingles will have up to 87 shingles per square. Architectural shingles will have anywhere from 57 to 66 shingles per square.

The number of shingles in an architectural or laminated shingle bundle vary since there are many, many different varieties of these types of shingles available for purchase. Sizes are different and therefore the number of shingles in a square differs from square to square for that type of shingle.

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## How To Measure Your Total Roof Area

Length x width = square footage

In order to determine the amount of shingles you need for your roof, youll need to know the square footage of your roofs surface. Measurements for the area of the roof will depend on what roof type you may have, whether its a gable roof with fewer planes or a hip roof with more.

To find the square footage of your roof, measure the roof length and roof width of each plane, including overhangs, and multiply them together. Then, add up the square footage of each plane. This will give you the total square footage.

## How Many Square Feet Does A Bundle Of Shingles Cover

One bundle of shingles covers roughly 33 square feet of roof. Some manufacturer bundles will cover slightly less and will range from 28 up to 33 square feet.

For some brands and types, the square feet per bundle may vary. A bundle of one type of shingle may have one extra than a bundle of the same type and brand. Some bundles will indicate a shingle minimum on the package. If that is the case, the square footage of the bundle will also vary, but not by much and it will always be at or around of 100 square feet.

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## How To Calculate A Roofing Square

Before beginning, make sure you can safely access your roofif 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.
• ## How Many Bundles Of Shingles Do I Need Calculator

The most accurate way to calculate how many bundles of shingles youll need is to get up on the roof and measure each roof plane. If all the roof planes are rectangles, you simply need to multiply the length times the width of each plane to get the square footage then you will add up the square footage of each plane.

Beside this, How many square feet will 3 bundles of shingles cover?

33.3 sq

Likewise, How many bundles of shingles make up a square?

3 bundles

Also, How many bundles of shingles do I need for 100 square feet?

three bundles

How many shingles do I need for 100 square feet?

Roof surfaces are measured in squares. A roofing square is equal to 100 square feet of the roof. To determine the number of squares on the gable roof example in this post, divide its total of 2400 square feet by 100 . This means you would need 24 squares of shingles to cover that roof.

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## How Many Shingles Do I Need For A 2424 Garage

For this example, well use the same type of roof a simple gabled roof. For our purposes, well say that the roof extends 1.5 around each side.

Well first calculate one face of the roof. The length of the roof is 24+1.5+1.5, which equals 27. The roof pitch is 4:12, which means the width of the roof is about 12.5. Add 1.5 of overhang to this number and you get 14 of roof width on one roof face.

Multiply 27 by 14 and you get 378 square feet for one roof face. The total roof area is 756 square feet. Divide this number by 100 to determine the amount of roof squares youll need, which equals 7.56 roofing squares.

Multiply 7.56 roofing squares by 3 bundles per square. Thus, 23 bundles of shingles are required to cover a 24×24 garage with 1.5 overhangs on all sides.

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