A direct comparison for standing seam using a nail flange, standing seam clip system, and mechanically seamed standing seam roofing.

When it comes to roofing, standing seam metal roofs have become a popular choice due to their durability, longevity, and sleek aesthetic. However, within the realm of standing seam metal roofing, there are several different installation systems. The three primary types are: standing seam metal roofing using a clip system, standing seam metal roofing using just screws, and mechanically seamed standing seam metal roofing panels. Each system has its own advantages, and choosing the right one depends on various factors, such as the building’s design, budget, and the environmental conditions the roof will face. Let’s dive into the differences between these three roofing systems.

1. Standing Seam Metal Roofing with a Clip System

What is it? In this system, the metal panels are attached to the roof deck using clips that are fastened to the underlying structure. These clips hold the panel in place and allow for expansion and contraction as the temperature changes.

How it works: The metal panels, which are typically made from steel, aluminum, or copper, are interlocked and clipped into place. The clip system allows the panels to float freely, meaning they are not directly attached to the roof deck with screws. The clips hold the panels at specific intervals, leaving space for the metal to expand and contract without causing stress or damage to the roofing material.

Benefits:

• Thermal Movement: The clip system allows for natural thermal expansion and contraction of the panels without causing the material to warp or crack.
• Aesthetics: Since there are no visible fasteners on the surface, the clip system provides a clean and sleek look, enhancing the roof’s overall appearance.
• Durability: The clip system reduces the risk of the panels becoming loose or damaged over time, increasing the longevity of the roof.
• Less Potential for Leaks: Because there are no penetrations through the roof panels themselves, there’s less chance for water to infiltrate the roof structure.

Ideal for: Clip systems are best suited for commercial and residential buildings where appearance and long-term durability are important. They are particularly useful in areas with significant temperature variations, as they accommodate thermal expansion and contraction more effectively.

2. Standing Seam Metal Roofing Using Screws (Fastened System)

What is it? In this type of system, the metal panels are fastened directly to the roof deck with screws. The screws go through the metal panels and into the deck, securing the panels in place. Typically, the fasteners are hidden beneath the seams of the panels, but they are still attached directly to the material.

How it works: The panels are installed with screws that are spaced regularly across the roof. The screw heads are typically covered by the seams of the panels, providing some protection from the elements. However, unlike the clip system, there is no allowance for the panels to float or expand and contract independently.

Benefits:

• Cost-Effective: Screw-fastened standing seam systems are typically less expensive to install compared to clip systems, making them a more budget-friendly option.
• Simpler Installation: The installation process is faster and requires fewer steps than the clip system, which can be a benefit for projects on a tighter timeline.
• Durability: While it does not offer the same flexibility as a clip system, the screw-fastened method still offers a durable and long-lasting roofing solution if properly installed.

Drawbacks:

• Thermal Movement Constraints: Because the panels are screwed directly into the deck, they cannot expand or contract freely as they can with the clip system. Over time, this could cause the screws to loosen, resulting in the potential for leaks or damage.
• Visible Fasteners: Even though the fasteners are covered by seams, the metal panels can still be susceptible to rust or other issues around the fasteners, especially if not properly maintained.

Ideal for: This system is a good choice for homeowners or building owners who need a more affordable solution and are not dealing with extreme temperature fluctuations. It’s commonly used in residential buildings and smaller commercial structures.

3. Mechanically Seamed Standing Seam Metal Roofing

What is it? The mechanically seamed standing seam system uses special machines to “mechanically” crimp or fold the edges of the metal panels together to create a sealed, interlocked seam. This system is a more advanced version of standing seam roofing and can be put on lower sloped roofs.

How it works: Once the panels are placed and aligned, a machine is used to form the seams by mechanically folding the edges of the panels over one another, creating a strong bond that holds the panels securely in place. This type of roofing typically uses clips as well but incorporates a locking mechanism that ensures the panels are tightly sealed.

Benefits:

• Strong Weather Resistance: The mechanically seamed design offers excellent protection against strong winds, heavy rain, and even snow buildup. The locked seams are more resistant to water infiltration.
• Longevity: This system offers the highest level of durability due to the interlocked, mechanically sealed seams, making it less prone to expansion or contraction problems over time.
• Seamless Look: Like the clip system, there are no visible fasteners on the exterior of the roof, which provides a clean, sleek appearance.

Drawbacks:

• Higher Cost: Mechanically seamed roofs tend to be more expensive due to the need for specialized tools and more labor-intensive installation.
• Installation Complexity: The installation process requires precise attention to detail and trained technicians, making it a more complex system to install compared to the other two options.

Ideal for: Mechanically seamed standing seam systems are ideal for high-end residential homes, commercial buildings, and industrial structures that require maximum weather resistance and a long lifespan. These roofs perform well in areas with extreme weather conditions.

Conclusion: Which System Should You Choose?

The right standing seam metal roofing system for your project depends on a variety of factors. If budget is a primary concern, the screw-fastened system may be the best option for you. If you want a roof that can accommodate thermal movement and has a clean appearance, the clip system is an excellent choice. However, if you’re looking for the highest performance in terms of weather resistance and durability, the mechanically seamed system is worth considering.

Each system offers unique advantages, and understanding the differences will help you choose the one that best suits your needs, budget, and the conditions your roof will face over the years. Whichever option you go with, standing seam metal roofing is always a great choice for your roofing needs.