Specifying Skylights
by Marcy Marro | December 1, 2021 12:00 am
Performance criteria to keep in mind while trying to create effective daylight distribution
VELUX Modular System, Longlight, in Winter Farms equestrian arena.
The next time you’re specifying skylights, keep these factors in mind.
Consider the structure supporting the roof system.
The building structure is the most important element to consider when adding skylights onto metal buildings, and it directly influences specification. Whenever possible, we recommend installing skylights over structural steel members beneath the roof to help with weight deflection. The roof profile and building layout also help to determine where to install skylights. Depending on how steep the pitch is, it may help or hinder the light disbursement from the skylights.
When accounting for the additional weight of a skylight, there are traditional glazing options such as glass, as well as lighter options such as translucent, polycarbonate panels. Polycarbonate skylights can significantly reduce the weight load on the roof, provide even diffuse light inside the building, and contribute to better energy efficiency.
Additionally, skylights need to be able to resist wind loads and bear the weight of imposed loads such as snow, and people accessing the roof for repair or maintenance. Impact testing results declared by manufacturers demonstrate the safety of units.
Look for National Fenestration Rating Council (NFRC) certified products and manufacturers that have been through rigorous testing regarding energy efficiency and more.
Winter Farms equestrian barn exterior featuring VELUX Modular System, Ridgelight.
Maximize daylighting while managing performance.
Once you have an idea of the support system and roof pitch, the design focus turns to maximizing skylight contribution to the desired lighting level, while balancing energy-efficiency demands.
Specification should take into account the building’s location, the roof’s orientation and the needs of the occupants, such as when and where daylight is needed most during certain times of day.
Choosing a glazing option and conducting daylight modeling in the early stages of a project helps to confirm product selections and placement. Additionally, these steps make it more likely that the finished building will deliver on the promised building performance and occupant comfort.
Consider these options when selecting skylights or a skylight system for your next metal building.
- Ventilation is critical to providing a healthy indoor climate. Consider operable skylights that create natural airflow.
- Understand the light control needs of the occupants. Some skylight systems can be equipped with remote-controlled shades to control solar gains into the building and reduce glare (on screens in an office, for example).
- Choose time-saving products. Consider a modular skylight system that arrives on-site prefabricated and ready for installation on a site-built curb.
- Think about acoustics. In addition to thermal performance double or triple glazing contribute to acoustic comfort.
Working with a recommended installer is imperative. The skylight attachment method is the key differentiator to make sure your contractor or installer partner gets a solid connection to the building structure.
Flashing and sealing are key considerations for metal roofing. In most cases, the curb is attached to the top of the exposed roof. Upon determining a fastening method, all openings must be sealed in some shape or form with sealants or coatings. Use the curb options recommended by roofing manufacturers, as they provide an ideal fit.
Speaking to a skylight manufacturer at an early stage helps to avoid under- or over-specification and, ultimately, a greater impact on the project.
Brian Grohe is the commercial sales manager with VELUX America Inc., Fort Mill, S.C. For more information, visit commercial.veluxusa.com[1].
- commercial.veluxusa.com: http://commercial.veluxusa.com
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