Shingles Needed For 12×20 Shed (Drawings Included)

12x20 shed

The number of shingles in a 12×20 foot shed will depend on the type of roof the shed has.

But don’t worry, in this topic, I will include drawings with measurements of the different types of roofs on 12×20 ft sheds, and of course, including the number of shingles needed in each example.


How many shingles are needed for a square feet area?

The number of shingles needed for a square foot of roof area depends on the type of shingle you’re using. A common type of shingle used in roofing is the “3-tab” shingle.

Typically, three 3-tab shingles are needed to cover one square foot of roof area. This is because a “3-tab” shingle has three separate tabs that are each 12 inches wide by 5 inches tall. When laid correctly, the three tabs will cover an area of 1 square foot.

Keep in mind that this is a general rule and can vary slightly depending on the brand and style of the shingle. It’s always a good idea to check the packaging for the manufacturer’s recommendations.

However, in this guide, you will get the square footage of each roof.

Gable roof 12×20 shed


The amount of shingles needed for a 12×20 ft. shed would be 272 sq. ft. (135.93×2), in the drawing, the area shown is only one side of the gable roof.

You would need 9 bundles of 3-tab shingles to cover a 272-square-foot area.

It should also be noted the line of shingles that are placed at the joint or peak of the gable roof, is called the “ridge cap” or “ridge shingles”.

These specialized shingles are designed to cover and protect the ridge of the roof where the two slopes meet, keeping water and other elements out.

How to know how many shingles you need for the ridge?

So, you’re going to start by figuring out how long that ridge is. Just get up there with a tape measure and measure the length from one end to the other. That’s going to be your ridge length.

Now, when you’re looking at buying ridge cap shingles, the packaging is going to tell you how much ridge length they’ll cover.

They usually come in bundles, and each bundle covers a certain length. For example, you might find that a bundle covers 20 feet of ridge.

Next, you’re going to take that ridge length you measured and divide it by the length that a bundle of ridge cap shingles covers. So if your ridge is 40 feet long and each bundle covers 20 feet, you’ll need 2 bundles.

In the case of a 20-foot-long ridge, you would need just one bundle of ridge cap shingles. However, it’s often recommended to purchase a bit of extra in case of waste, miscalculations, or damaged shingles.

Hip roof 12×20 shed

hip roof

A 12×20 shed with a hipped roof has an approximate area of 371 square feet, according to the 3D model I put in this example.

So you’d need 12 bundles of 3-tab shingles to cover an area of 371 square feet.

The number of ridge pieces for this example is 48 linear feet (12 linear feet per edge), you would need 2 bundles of ridge cap shingles to cover a 40-foot-long ridge.

Barn Style 12×20 shed

barn style shed

This type of shed has a total roof area of 327.92 square feet (163.96×2), the area shown in the drawing is one of the sides.

So, you’d need 10 bundles of 3-tab shingles to cover a 328-square-foot area.

This type of roof also has 60 linear feet of ridge, which means you would need 3 bundles of ridge cap shingles to cover a 60-foot long ridge.

What types of shingles are available and how does their type affect coverage?

let’s dive into the world of roofing shingles. There’s quite a variety out there, each with its own unique characteristics and coverage.

First up, we have the 3-tab shingles. These are pretty common and you’ve probably seen them around a lot. They’re called 3-tab because each shingle has three distinct tabs.

When it comes to coverage, a bundle of 3-tab shingles typically covers around 33.3 square feet.

Then, we have architectural shingles, sometimes called dimensional shingles. They’re a bit thicker and have a layered look that can give a roof a more ‘dimensional’ appearance.

They’re also typically more durable than 3-tab shingles. However, because of their size and shape, a bundle usually covers less area than 3-tab shingles – around 25 to 30 square feet.

There’s also something called luxury or designer shingles. These are the high-end option, designed to replicate the look of natural materials like slate or cedar.

They’re often more durable and come with longer warranties, but they’re also more expensive. Their coverage is similar to architectural shingles, but because they’re heavier, you may find fewer shingles in a bundle.

Speaking of cedar, cedar shake shingles are another option. They’re made from split logs, which give them a rustic and textured appearance.

Their coverage varies depending on their size and thickness, so you’d need to check the specific product details.

Lastly, you’ve got your tile, metal, or slate shingles. These are less common for sheds and more often found on homes, but they each have their unique characteristics and coverage.

So, when choosing shingles, you’re not just looking at aesthetics. You’ve got to consider how much area they’ll cover, how long they’ll last, and of course, how much they’ll cost. It’s a bit of a balancing act, but that’s what makes it interesting, right?

Just remember that when you’re calculating the number of shingles you need, always plan for a bit extra to account for cuts, mistakes, or future repairs.

How do different roof styles affect the number of shingles needed?

When you’re planning a roofing project, the style of your roof definitely plays a big part in how many shingles you’ll need.

Think of a gable roof – that’s the one that looks like an inverted ‘V’. Because it has just two flat sides sloping in opposite directions, it’s relatively easy to calculate the area you’ll need to cover.

You can almost think of it like two big rectangles you’re laying your shingles over.

Now, contrast that with a hip roof. With a hip roof, all four sides slope downwards, which means there are more surfaces to cover. Not only that, the slopes often have different dimensions.

So, when you’re figuring out how many shingles you’ll need for a hip roof, you’ll be calculating for each of the four sides, not just two.

Then, there’s the gambrel roof, often found on barn-style sheds. Gambrels have two different slopes on each side – the lower one is steeper and the upper one is more gentle.

This design can give you more storage space in the attic, but it also means more surface area to cover with shingles.

Finally, think about a flat or low-slope roof. These can be a bit deceiving because even though they look flat, they actually have a slight pitch to help with water runoff.

Despite their name, because they are relatively flat, they often require fewer shingles than other styles.

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