Metal Roofing Systems- Understanding Standing Seam

Metal Roofing systems are quickly gaining popularity among Vancouver homeowners. Standing Seam metal roofs are one of the most popular metal roof options available. Boasting aesthetic appeal, energy efficiency, sustainability and low maintenance, these roofing systems can be an important factor in increasing the value of your home and lowering your carbon footprint. So let’s delve into some of the options to consider when choosing a standing seam metal roof.

Within this category there are two main types of systems: Snap-lock and Mechanical seam systems, offering either single-lock or double-lock seams. In this article, we’ll break down these different types of standing seam systems, helping you understand the differences and how they perform in Vancouver’s unique climate.

What is a Standing Seam Metal Roof?

A standing seam metal roof consists of long panels with raised seams that interlock vertically, running from the ridge to the eaves of the roof. These seams stand “up” from the roof panels, creating a modern, clean look while providing an effective way to shed water and protect your home from the elements.

Standing seam systems are highly durable, energy-efficient, and low-maintenance, making them ideal for Vancouver’s wet climate. The main difference between the systems is how the seams are locked together. Let’s learn about the difference between snap-lock and mechanical lock seams.

Snap-Lock Standing Seam

Snap-lock roofing systems are the most basic type of standing seam roof. As the name implies, the panels in a snap-lock system “snap” into place, with the seams interlocking through a simple, manual process. The panels are designed with a locking mechanism that allows the seams to fit together without the need for mechanical fasteners or special tools. Here are some key features of a snap-lock system:

Seam Profile: Snap-lock seams are typically between 1″ and 1.5″ i height. Fasteners are completely concealed, creating a sleek, uninterrupted appearance.
Customizable: Panels can be made to any length, ensuring a perfect fit for your roof.
Efficient Water Runoff: The design promotes efficient water drainage, protecting your home from leaks and water damage.
Variety of Finishes: Available in a range of colors and coatings, including galvalume and Kynar, to match your style and budget.
Easy Installation: The snap-lock design makes installation faster and more efficient than traditional metal roofing systems.
Durability: These systems are durable enough to withstand moderate weather conditions. However, because the seams are not mechanically secured, they can be more vulnerable to damage from extreme wind or snow accumulation compared to mechanical lock systems.
Ideal for: Homes in areas of Vancouver that don’t experience extreme weather conditions (i.e., heavy snow, high winds)

At Eco Exteriors, our flagship snap-lock seamless roofing system, Eco-Lock, is designed for both residential and commercial projects. Check out it’s unique features here.

The panels in a snap-lock system “snap” into place, with the seams interlocking through a simple, manual process. Whereas mechanical seams, either single or double lock, are mechanically folded or crimped together.

Mechanical Lock Standing Seam

Mechanical lock standing seam roofs, which include both single-lock and double-lock systems, are more robust and secure than snap-lock systems. In these systems, the seams are mechanically folded or crimped together, providing a tighter, more durable bond. These roofs are ideal for homes in Vancouver that need a more secure and weather-resistant option to handle heavier rains and strong winds.

Single-Lock Metal Roofing

In a single-lock system, the edges of the panels are mechanically crimped over each other to form a single, secure lock. This lock is typically created by using specialized tools to fold the seam at a 90-degree angle, ensuring a tight seal. Here are some key features of a single-lock standing seam system:

Seam Profile: Single-lock seams typically rise around 1″ to 1.5″, offering a sleek and modern profile. The raised seams are more pronounced than snap-lock, providing additional resistance against water infiltration.
Energy-Efficient: Helps regulate temperature and lower energy bills.
Customizable Style: Choose from a variety of colours and finishes.
Low Maintenance: Requires minimal upkeep for lasting beauty.
Increases Home Value: A premium feature that boosts your investment.
Durability: The mechanically crimped seams in single-lock systems provide better protection against water and weather conditions than a snap-lock system, making it a more durable option for homes in Vancouver.
Ideal for: Homes in Vancouver that experience heavy rainfall, mild snow, and moderate winds or those who want added protection against water infiltration

Double-Lock Metal Roofing

Double-lock systems offer the highest level of durability and weather resistance among the mechanical lock options. In this system, the seams are mechanically folded twice—once at a 90-degree angle, and then again in a second fold, creating a double-lock that offers a superior bond. This double-folded seam is the most secure and weather-resistant option available. Here are some key features of a double-lock standing seam system:

Seam Profile: Double-lock seams are typically 1.5″ to 2″ high, creating a more pronounced, architectural appearance. The double-folded seams not only give the roof a more defined look but also offer maximum protection against water infiltration.
Energy-Efficient: Helps regulate temperature and lower energy bills.
Customizable Style: Choose from a variety of colours and finishes.
Low Maintenance: Requires minimal upkeep for lasting beauty.
Increases Home Value: A premium feature that boosts your investment.
Durability: Double-lock roofs are the most durable and water-tight option, providing superior resistance against Vancouver’s heavy rain, snow, and winds. The double-folded seams ensure a tighter bond, making it nearly impervious to the elements, even in the harshest conditions. For homes in Vancouver located in areas prone to extreme weather, such as coastal winds or heavy snow, double-lock is the best choice.
Ideal for: Homes located in areas of Vancouver with extreme or coastal weather conditions, such as heavy rain, strong winds, or snow, or those looking for a roofing system with maximum performance and longevity.

A comparison of single-lock vs double-lock mechanical seams: The single-lock seam is mechanically folded at a 90-degree angle. The double-lock is folded 90-degrees, and then folded again for a full 180-degree fold.

How to Choose the Right Option for Your Vancouver Home

Choosing between snap-lock and mechanical lock systems (single-lock and double-lock) depends on your home’s specific needs, and the severity of weather where your home is located. Here’s a quick comparison:

Eco-Lock

Single-Lock Mechanical Seam

Double-Lock Mechanical Seam

Sleek, uninterrupted appearance. Easy installation. Best suited for homeowners in areas with mild to moderate weather. Snap-lock performs well in Vancouver’s mild climate and is ideal for homes that don’t experience frequent snow, extreme winds, or heavy storms.

Modern profile with slightly more pronounced seams. Offers a step up in durability and weather resistance. Single-lock provides a more secure seal, making it a good choice for homes in Vancouver that experience heavy rainfall and moderate winds.

The most secure and durable option, double-lock is the best choice for homeowners who need the most protection against the elements. If your home is located in an area prone to coastal winds, heavy rainfall, or snow accumulation, double-lock offers maximum resistance to water infiltration and long-lasting protection.

Standing Seam Comparison Table

Seam Type	Height	Mechanics	Weather Resistance
Eco-Lock	1"-1.5"	Snaps into place	Homes that experience mild to moderate weather conditions
Single-Lock	1"-1.5"	Folded 90 degrees	Homeowners who want added protection against water infiltration. Homes that experience heavy rainfall, mild snow, and moderate wind.
Double-Lock	1.5"-2"	Folded 180 degrees	Homeowners looking for a roofing system with maximum performance and longevity. Homes that experience extreme or coastal weather conditions, such as heavy rain, strong winds, or snow.

No matter which option you choose, a standing seam metal roof provides long-lasting value, energy efficiency, and a sleek, modern aesthetic for your Vancouver home. Understanding the differences between snap-lock and mechanical seam lock systems will help you make an informed decision and ensure your roof can stand up to the Pacific Northwest’s unique climate.

Consider Eco Exteriors

If you’re looking for an eco-conscious roofing solution, consider Eco Exteriors. We specialize in sustainable roofing options that prioritize both performance and environmental responsibility. Our team of experienced professionals can help you select the perfect metal roofing system for your Vancouver home and ensure a flawless installation that will protect your investment for years to come.