Single Lock vs Double Lock Standing Seam

Single Lock vs Double Lock Standing Seam

As the name suggests, standing seam metal roofs use large panels that run from the ridge of a roof all the way down to its eaves. These panels are held together by mechanical locks which come in two versions: Single Lock and Double Lock.

Single Lock is ONE fold of the seam and performs well in milder environments. It requires less labor and it’s easier to replace a damaged panel. Double Lock, on the other hand, requires TWO folds of the seam and is suitable for low-slope applications needing extra weather-tightness.

The decision between single lock vs double lock standing seam depends on your roof’s pitch and geography, as well as its environment. Use 2-inch double lock profile when you have a .5/12 pitch or lower while 1.5 inch double lock profile works best down to a 1/12 pitch with in-seam sealant.

What Mechanical Lock Profile Should You Choose: Single Lock or Double Lock Standing Seam?

Let’s go-over them one-by-one:

Single Lock

Single lock is a 90-degree seam that performs well in milder environments. It also requires less labor to install, making it a economical choice for many properties. Additionally, it’s easier to replace a damaged panel, making it an ideal solution for areas prone to harsh weather conditions. However, single lock panels may not be suitable for low-slope applications or climates with freezing and thawing cycles.

Double Lock

Double lock is a 180-degree seam that offers more weather-tightness than single lock and is suitable for low slope applications needing extra protection from the elements. Generally speaking, 2-inch double lock profile can generally be installed down to a .5/12 pitch, while 1.5 inch double lock profile can generally be used down to a 1/12 pitch with in-seam sealant (based on geography). Expansion clips should also be used when possible for added stability.

Here’s a summary of their differences so that you can decide for yourself”

Standing Seam TypeSeam DescriptionEnvironmentLabor RequiredWeather-tightnessRecommended Pitch
Single Lock90-degree seam (ONE fold)Milder environmentsLess laborGoodNA
Double Lock180-degree seam (TWO folds)Cold weather areas with freezing and thawingMore laborExtra weather-tightness2-inch double lock profile can generally be installed down to a .5/12 pitch, while 1.5 inch double lock profile can generally be used down to a 1/12 pitch with in-seam sealant (based on geography)

Advantages of a Single Lock Standing Seam Compared to a Double Lock Standing Seam

Installation and Cost Efficiency

A significant advantage of a single lock standing seam compared to a double lock standing seam is that it is less complicated to install. Single lock standing seam panels are also more straightforward and easier to manufacture, thus reducing the overall fabrication cost. On the other hand, the installation process for a double lock standing seam is more tedious and requires more labor, which can increase the cost of installation.

Weather Resistance

Another advantage of a single lock standing seam is that it is more resistant to harsh weather conditions.

Because of its larger seam width, single lock standing seam panels are more stable and can withstand high winds, heavy rainfall, and snow loads without the need for additional clips. This means that it provides adequate protection for homes and structures, especially in areas prone to severe weather conditions.


A single lock standing seam provides a more attractive look to homes and structures. It comes in a wide range of colors, finishes, and profiles, allowing homeowners to customize it according to their preferences.

Even more, it is commonly used in modern architecutural designs and provides a sleek, contemporary look lacking in double lock standing seam installation.

Disadvantages of a Double Lock Standing Seam Compared to a Single Lock Standing Seam

Difficulty of Installation

One of the main disadvantages of a double lock standing seam compared to a single lock standing seam is the difficulty of installation. Due to the additional seam, a double lock is typically more difficult to install, which can result in a higher cost of installation. This is because a double lock requires extra precision and expertise to ensure that the two seams are properly aligned, and there is no damage to the panels during the process.

Higher Material Costs

Another disadvantage of a double lock standing seam is that it typically requires more materials, which can lead to higher material costs. This is because a double lock requires an additional seam, which means there are more panels and connectors required to achieve the same coverage as a single lock. These additional materials can add up quickly, resulting in a higher overall cost for the project.

Less Flexibility

When it comes to flexibility in design, a double lock standing seam may fall short compared to a single lock standing seam. This is because a double lock typically has a narrower seam compared to a single lock, which means there may be fewer design options available. Additionally, the narrower seam can limit the size of the panels, which may not work for larger projects and could limit creativity in the design process.

Risk of Water Penetration

One potential disadvantage of a double lock standing seam compared to a single lock standing seam is the risk of water penetration. While both options are designed to prevent water from leaking into the building, a double lock may be more susceptible to leaks due to the additional seam.

If not properly installed, the seam can allow water to seep through and cause damage to the building. This risk can be mitigated with proper installation and regular maintenance, but it is still something to consider when choosing between the two options.

What Is Double Lock Standing Seam?

Single Lock vs Double Lock Standing Seam 1

Double lock standing seam is a type of metal roofing that eliminates the risk of leaks through its panels. With no penetrations through the metal panels, there’s absolutely no chance of fastener penetration causing a leak. Each panel operates independently, while still maintaining a strong connection to its neighboring panels.

This way, the roof stays intact and reinforced in the strongest possible manner.

With double lock standing seam, there’s no need to worry about any potential roofing mishaps. Plus, it’s a sleek look that provides an elegant touch to your building’s exterior.

It’s easy to install and gives you peace of mind when it comes to potential hazards like bad weather or heavy snowfall. Double lock standing seam can be the perfect option for those looking for a reliable and low-maintenance roof that’s also visually appealing.

What Is the Difference Between Single Seam and Double Seam Roof?

Difference Between Single Seam and Double Seam Roof

Single seam and double seam roofs have one key difference in the number of folds in their seams. Single seam roofs have just one fold while double seam roofs have two folds. While single seam roofs are quicker and less expensive to install, they are also less secure and not as weather-tight as double seam roofs.

On the other hand, double seam roofs may cost more to install due to the added labor for the second fold, but they offer a significantly better performance, making them a more popular choice. Ultimately, the choice of roofing system depends on the specific needs of the building and the budget of the homeowner.

What Is the Best Type of Standing Seam Roof?

Choosing the best type of standing seam roof largely depends on your personal preferences and needs. However, among the two main types of panels available, symmetrical and asymmetrical panels, many people tend to favor the symmetrical ones. This is because symmetrical panels offer a sleeker and more uniform look that is appealing to many homeowners and architects alike.

That being said, asymmetrical panels can also be a great option, especially if you are looking for more flexibility in terms of designing your roof.

The different leg lengths can help create unique patterns and designs that may be harder to achieve with symmetrical panels. Ultimately, the best type of standing seam roof for you will depend on the look you are going for and the functionality you need.

What Are the Different Types of Standing Seam?

Standing seam is one of the most popular types of metal roofing used today, known for its durability and sleek look. There are different types of standing seam available in the market, each with its own defining characteristics. One of them is the snap-lock standing seam which is designed with a special interlocking system that doesn’t require any special tools to install.

Another type is the mechanical standing seam that uses a seaming tool to interlock the panels, creating a strong and watertight connection. Additionally, there is also the batten seam, which utilizes a vertical batten to secure the panels together, and the symmetrical mechanically seamed standing seam which uses a double-lock system to make the panels weather-tight. Understanding the features and benefits of each type of standing seam roofing will help you choose the right one for your project.

What Is the Best Type of Standing Seam Roof?

If you ask most experts about the best type of standing seam roof, they’re likely to tell you that the snap lock design is your best bet. It’s a popular option for many reasons, not least of which is its performance. Snap lock panels hold up well against even the harshest of environments, making them an ideal choice for homeowners and business owners alike.

Another reason why snap lock is the standout choice is its affordability. Compared to other standing seam options, it’s relatively cost-effective. And to top it all off, snap lock panels are easier to install than some of the other types.

That means less time and effort spent getting your roof up, which can be a big relief for many people. Overall, it’s clear that snap lock is the type of standing seam roof that ticks all the right boxes.

What Is the Difference Between Standing Seam 12 and 16?

Standing seam roof panels are available in two popular widths, 12” and 16”. The choice between these two widths largely depends on the size and structure of your roof. If you have larger sections of roof, choosing the 16” panels will help to minimize the appearance of seams and give your roof a clean, streamlined look.

However, if your roof has smaller individual sections, the 12” wide panels may be a better choice since they will look more proportional to the overall size of the roof.

Ultimately, the decision comes down to personal style preferences. If you prefer a more minimalistic look, the wider 16” panels may be your best bet. Conversely, if you prefer a more traditional or classic look, the 12” panels may better suit your tastes.

Regardless of which width you choose, standing seam roofs are a highly durable and reliable option that will last for many years with proper care and maintenance.

What Type of Metal Is Standing Seam?

Standing seam is a type of metal roofing system that comes in various materials to suit different needs. These materials include aluminum, aluminum/zinc coated alloy, coated steel, and copper. Copper standing seam is the most popular and a great option for use in historic and high-end commercial buildings, but it is often the most expensive.

Aluminum standing seam is the most commonly used option for residential properties as it is very lightweight, durable and relatively affordable. Coated steel is also popular for commercial properties due to its strength and corrosion resistance.

Overall, standing seam metal roofing is a versatile and durable option that is available in various materials. Each material has its benefits and drawbacks, so it’s important to choose the right one based on your specific needs and budget.

What Is the Difference Between Batten Seam and Standing Seam?

Batten seam and standing seam are two types of roofing systems used in the construction of commercial and residential buildings. Standing seams are known for their sleek and modern look, as they involve panels that are joined along their edges, forming a raised seam that runs vertically. Batten seams, on the other hand, use an underlying framework of wooden battens where the metal panels are mounted between a raised batten strip, which is then covered with a cap.

While standing seams offer better protection against moisture, batten seams are more suitable for historic buildings or those with a traditional design.

Batten seams, being a more traditional roofing style, are ideal for buildings that require a classic appearance. Standing seams, however, are more versatile, as they come in a wide range of shapes and sizes, allowing for customization to fit a variety of building types. Ultimately, the choice between batten and standing seams will depend on factors such as the building’s design, location, and budget.

What Is a Batten Seam?

Batten seam is a roofing system consisting of copper pans that run parallel to the roof slope. Separating these pans are wood battens, which help keep the pans in place over time. The batten seam roofing system is unique in that it allows for the width of the pre-formed or field-formed pans to vary according to the design requirements of the project.

Additionally, these pans are covered with copper caps, which are loose locked into adjacent pans to create a watertight seal. The use of copper also ensures long-lasting durability and protection against severe weather conditions. Overall, batten seam roofing is a great choice for those looking for a reliable, attractive roofing system that requires minimal maintenance.

What Is Meant by Standing Seam?

So, when we talk about “standing seam,” we’re basically talking about a type of seam that you’d see on metal roofing. What happens is that the edges of two adjacent panels are turned up and then folded or interlocked in different ways to create a nice, tight seam. This helps to keep water and other elements out of your roof, which is obviously a good thing.

Standing seam roofs can be pretty cool-looking, too, especially if you’re into that kind of industrial, modern aesthetic.

They’re also known for being really durable and long-lasting, which is definitely a plus if you’re looking for a roof that will stand up to the test of time. Overall, if you’re in the market for a new roof and you’re considering metal roofing, you might want to take a closer look at standing seam roofs and see if they might be a good fit for your needs.

What Do Batten Seams Standing Seams and Flat Seams All Describe Types Of?

Batten seams, standing seams, and flat seams are all terms used to describe different kinds of architectural sheet metal roofs. These roofs are popular in modern architecture due to their aesthetic appeal and durability. Batten seams are used to connect individual metal panels together, creating a watertight seal that can withstand harsh weather conditions.

With standing seams, metal panels are overlapped and raised or standing, creating a visually appealing pattern that makes a building stand out. Flat seams, on the other hand, connect the metal panels and lay flat or flush against the roof surface, giving a more streamlined appearance.

Architectural sheet metal roofing is a specialized field that requires proper installation and maintenance.

The different types of seams used in this roofing method each have their strengths and weaknesses, so it’s important for a trained professional to evaluate your roofing needs before deciding on the best option for you. With batten, standing, and flat seams at your disposal, you can choose a roofing style that best matches your building’s aesthetics and provides long-lasting protection against the elements.

Which Type of Standing Seam Metal Roofing is Best Suited for Different Roof Slopes?

When selecting the best standing seam metal roofing for different roof slopes, it is essential to use a reliable metal roof slope selection guide. This guide ensures that the roofing materials you choose will fit securely and provide the necessary protection against environmental elements. The type of standing seam metal roofing best suited for different slopes depends on factors such as roof pitch, roof size, weather patterns, and aesthetic preferences.

Frequently Asked Questions

Is Standing Seam Roof Better?

Standing seam roof is definitely a better option when it comes to roofing. This is because it offers a lot of advantages over traditional roofing systems. One of the most significant benefits is that there are no exposed fasteners in a standing seam metal roof.

This means that the fasteners are not exposed to UV, moisture, wind, and other elements that can cause them to wear out over time. Instead, the fasteners are concealed, which makes them more durable and long-lasting. This also makes the maintenance process easier and less frequent, as you don’t have to replace the fasteners as often.

In short, standing seam metal roofing is a wise investment for any homeowner or business owner who values high-quality roofing that lasts for years.

Is Standing Seam Roof Worth the Money?

Standing seam roof is definitely worth the money if you’re looking for a roofing option that can last a long time with minimal maintenance. Not only do these metal roofing panels offer superior durability compared to other types like asphalt shingles or concrete tiles, but they also have a sleek and modern look that can enhance the overall appearance of your home or commercial building. Plus, the interlocking design leaves no exposed fasteners to rust or leak, making it an investment that will pay off in the long run.

While the upfront cost of a standing seam roof may be higher than some other roofing options, the potential for lower overall maintenance costs and longer lifespan make it a sound investment for those willing to pay a little extra upfront.

Additionally, standing seam roofs can be installed over existing asphalt shingles, making installation easier and more cost-effective. So if you’re looking for a roofing option that can offer high performance and a sleek aesthetic that can enhance your property’s value, standing seam roof is definitely worth considering.

What Are 3 Advantages of Standing Seam?

Standing seam metal roofs provide numerous advantages, and here are three of them. Firstly, they have a long lifespan, approximately lasting 50-80 years. This ensures that homeowners won’t have to worry about roofing system changes for quite some time.

Moreover, steel standing seam metal roofs come with a 40-year manufacturer warranty, giving you peace of mind that your roofing system is durable and long-lasting.

Secondly, standing seam roofing is installed in a way that guarantees a sleek, clean, and polished appearance. This kind of roofing system conceals all fasteners, providing a smooth, unbroken look. This is ideal for homeowners who want to improve their home’s visual appeal while providing a sturdy and reliable roofing system at the same time.

Lastly, standing seam roofs are very low risk, meaning they offer excellent protection against leakages and wear and tear.

This makes it a wise investment for homeowners that want to avoid costly repairs and maintenance expenses. All in all, standing seam roofs offer a multitude of advantages while increasing security, longevity, and protection.

How Long Will a Standing Seam Metal Roof Last?

Standing seam metal roofs are known for their durability and long lifespan. These roofs can last anywhere from 30 to 50 years or even longer, depending on various factors such as the quality of materials, maintenance, and weather conditions. However, it’s important to note that a leak can develop sooner if the flashing areas are not properly sealed.

Sealants and butyl tape are used to keep out debris that can cause damage. If these are damaged, missing or applied incorrectly, leaks can occur. So, while a standing seam metal roof can last for decades, it’s important to ensure that the flashing areas are maintained to prevent leaks from developing prematurely.

Do Standing Seam Metal Roofs Leak?

Standing seam metal roofs are generally considered to be very durable and weather-resistant. However, it’s not impossible for them to leak. In fact, any type of roofing system can leak if not installed or maintained properly.

One of the most common causes of leaks in standing seam metal roofs is improper installation.

If the panels are not correctly fastened or if there are gaps in the seams, water can seep in and cause damage. Additionally, if the flashing around roof penetrations like chimneys or vents is not installed properly, water can enter through those gaps as well. It’s important to have a qualified and experienced contractor install your metal roof to minimize the risk of leaks.

Regular maintenance and inspections can also help identify and prevent leaks before they cause significant damage.

Learn more about metal roofs:


When it comes to standing seam roofing, choosing between a single lock or double lock standing seam roof is an important decision. Double lock standing seam roofs offer more durability and better protection against leaks than single lock standing seam roofs, but they come at a higher cost. Ultimately, the best type of standing seam roof for you depends on your specific roofing needs and budget.

There are different types of standing seams, such as batten seam and flat seam, which describes the way the panels are attached to the roof. Whether you choose standing seam 12 or 16, the important thing is to work with a trusted and experienced roofing contractor who can help guide you in making the best decision for your roofing project.


Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *