Month: December 2017

Concealed v. Through-Fastened Metal Roof and Wall Panels: How to Choose

Posted on by Tyler Roose

All metal panels—whether for commercial, residential, industrial or agricultural applications—are attached to the structure using either fasteners, clips or a combination of both that keep them in place. Vertical panels, in particular, are often categorized by the type of fastening method used to attach them, which is most often either using hidden/concealed fasteners or using an exposed (through-fastened) method. Here we’ll look at the benefits your customers can experience when using these common fastening types, as well as their differentiators, including price/budget, durability, aesthetics and ease of installation.

Concealed-Fastened Roofing Panels

Concealed-fastened panels are attached to the substrate with clips, which means the panels are not pierced to secure the connection. The clips and fasteners, therefore, are concealed underneath the metal panels when properly installed—arguably making the roof more aesthetically pleasing. These panels are offered in various styles, depending on which options your customers choose and additional job-specific considerations. This method is common in architectural and residential applications where a clean appearance and protection from environmental exposure are priorities.

Through-Fastened (Exposed) Roofing Panels

Through-fastened panels are generally attached with screws or nails, which puncture the overlapping roofing sections to lock the panels into place. They are also installed using washers, which provide leakage protection around the puncture hole. The fasteners are on the outside face of the panel and are visible even after the installation is complete.

So, how do your customers decide which option is right for their project? See below for some factors that can help them choose between a concealed- or through-fastened approach.

Key Considerations

Price/Budget:

Concealed: Typically, concealed-fastened panels can be more expensive overall due to the longer installation time required. In addition to increasing the labor cost, this installation method also takes longer, which affects your customer’s project schedule. However, ABC’s SL-16® panel can be installed faster and for about the same cost as exposed-fastened panel systems.

Through-fastened: While less expensive, through-fastened applications are more prone to issues. For example, if a washer fails, the screw can pop, which allows water in and can cause leaks and corrosion. While washer material is of a higher quality and more dependable than in the past, this is still a concern.

Durability:

Concealed: Because concealed fasteners have limited weather exposure, they therefore generally have a longer lifespan than panels with exposed fasteners. Additionally, there is less wear and tear since concealed panel fasteners are not as affected by the metal panel expansion and contraction that occurs when temperatures fluctuate as exposed-fastened panels are.

Through-fastened: Because concealed fasteners have limited weather exposure, they generally have a longer lifespan than panels with exposed fasteners. Additionally, there is less wear and tear since concealed panel fasteners are not as affected by the metal panel expansion and contraction that occurs when temperatures fluctuate as exposed-fastened panels are.

Aesthetics:

Concealed: Aesthetically, the main question is whether your customers want the screws to be visible or if it’s important that they are hidden. A concealed-fastened application is considered more aesthetically pleasing, as the lack of visible fasteners, creating a smooth, clean appearance. Generally, residential and architectural buildings favor concealed-fastened roofing panels.

Through-fastened: As stated, the hundreds of fasteners required to secure panels are exposed and visible on the outside of the panels. This method is often used on agricultural and industrial buildings, as clean aesthetics are usually less important for customers in these markets.

Ease of Installation:

Concealed: Installing concealed-fastened metal panel systems is time-consuming and complicated as compared to through-fastened. In fact, the complexity of the process dissuades many DIY installers from taking on the task.

Through-fastened: Exposed-fastened metal panel systems require less installation time as each fastener is drilled directly onto the outside of the panels. This makes it the method of choice for the majority of DIY installers. Overall, this method works well with simple structures but can be difficult to use on more complex projects. It should also be noted that through-fastened panels should be installed with care so that there is proper sealing. There also may be length limitations due to thermal movement.

Conclusion

The type of fastener system your customers choose for a given metal panel project will depend on a wide array of factors—budget, durability, aesthetics and ease of installation. Making the right choice is one step in ensuring the success and integrity of their building for years to come.

For more information on ABC’s concealed and through-fastened metal panels, visit our website. As always, our team is ready to help with your metal panel needs, so reach out to your local representative today!

Proper Ventilation for Metal Roofs and Walls

Posted on by David Lester

Selecting metal roof and wall panels is a strategic investment for the life of a building. To protect their investment, it is key that your customers ensure the proper ventilation system is installed. Optimal air movement not only promotes temperature regulation and energy efficiency but also reduces the risk of moisture-related issues like condensation build-up. Here, we look at some of the main ventilation considerations and resources your customers need to ensure success.

ABC Blog: Proper Ventilation of Metal Roofs and Walls

Why is proper ventilation important?

Proper ventilation helps optimize the performance and efficiency of metal buildings by:

  1. Controlling condensation

Condensation can wreak havoc on metal, causing corrosion, reduced thermal performance of insulation, mold and mildew growth, and even insect infestations. For example, in warm and humid areas, outside air that enters a building without moving through a ventilation system can bring with it large amounts of humidity. This humid air can create an uncomfortable environment, accelerate panel weathering and increase the possibility of mold growth. This issue is worsened when the outside temperature falls below the inside temperature, creating a perfect breeding ground for condensation development.

  1. Regulating temperature

Regulating and maintaining ideal interior temperature can help cool the building in warmer months, keeping the structure comfortable to occupy. Temperature regulation also helps protect the integrity of the building from excess (and premature) metal panel expansion and contraction. This movement can weaken the integrity of fasteners, which are designed to keep panels from detaching/pulling away from the substrate.

  1. Preserving air quality inside the building

Proper ventilation helps remove volatile organic compounds and other air pollutants that are detrimental to human health and productivity. The Environmental Protection Agency (EPA) and the Occupational Safety and Health Administration (OSHA) have published guidance on indoor air quality standards in commercial/institutional buildings. These standards help determine ventilation needs that need to be met to ensure compliance.

Who Needs Ventilation?

As expected, most structures require proper ventilation in accordance with their geographic location, contents and/or building end-use. Structures housing chemicals or moist substances require more ventilation than those storing dry goods in relatively arid environments. Ventilating a building that stores ceramic in the desert is very different than ventilating an indoor sauna in practically any geographic location. Agricultural facilities in particular must employ proper ventilation to mitigate the dangers posed by ammonia and other corrosive airborne fumes. (See our Animal Housing blog post for more.)

How to Ensure Proper Ventilation:

Similarly, the ideal amount and type of ventilation your customers need depends on their building’s unique specifications and end use. Generally, structures larger than 2,400 sq. ft. may require more than one type of ventilator to allow air to move between them (cross-ventilation). Structures that house people, animals and/or valuable material also benefit from cross-ventilation using ridge vents near the roof and a louver vent located closer to the structure’s floor. In these cases, it is recommended that your customers work with design professionals and building engineers who can help determine the building ventilation requirements. These professionals can recommend the appropriate, high-quality metal panels and components that suit the unique requirements of their project.

So, what ventilation options are available for your customers? Ventilation solutions fall into two main categories: natural (unpowered) and mechanical (electrically assisted):

  • Natural ventilation methods include installing a ridge and eave vents that enable air to circulate naturally through the building. Your customers can also use vents that capitalize on the natural vacuum created when air moves quickly over angled surfaces like roofs. The lower pressure in this vacuum draws air out of the building—most often through ridge vents. This choice will depend on your customer’s aesthetic preferences and/or installation location limitations.

 

  • Mechanical or power-assisted ventilation helps draw more cubic feet of air into and out of the space per minute. Powered fans with curved blades and/or louvers are often used to achieve greater air flow. As previously noted, air flow is vital in preventing condensation, so this is particularly helpful in naturally humid environments.

Conclusion

In conclusion, proper ventilation is a critical component of any high-quality building. As metal panels are becoming more popular, understanding how to achieve an effective ventilation system can help ensure the success of your customers’ building projects.

For more on ABC’s ventilation solutions, visit our previous blog on condensation management, check out our ventilation-enabling components or reach out to your local representative today!