October 24, 2017
by Randy Tweedt
The beauty of skylights can be a real benefit to the aesthetic value of a metal building project. Beyond looks, though, the proven benefits of daylighting are many: building occupant satisfaction from natural lighting, mold and mildew growth prevention and, of course, energy savings, to name a few. In fact, once the decision has been made to go with metal for the roofing material, a skylight is often a natural tie-in when it comes to sustainable design—for both form and function. In order to make the most of the design choice, there are a few key considerations to bear in mind during the specification and pre-installation phases of the process.
Two common types of skylights used with metal roofs are Light Transmitting Panels (LTPs) and Curb Mount Skylights. Both supply natural light into the building and provide similar benefits. LTPs, which are formed from a translucent material and come in many different panel profiles, in actuality, can be used not only in metal roofs but as an accessory for metal wall panels, too. One of the key benefits of LTPs is that the panel is formed so that it substantially matches the configuration and characteristics of the system into which it is installed, and therefore can work seamlessly with specific metal roof systems. Curbed (curb mount) skylights include a raised structure (“curb”) formed around the roof opening where the skylight will be attached. Curb skylights come in many shapes and styles.
In addition to the general “type” of skylight, another consideration is selecting the best orientation for the skylight—which we’ll look at next.
Placement and orientation are some of the most important factors in getting the maximum benefit from skylights. During the planning phase, determine the best location to achieve optimal light and to avoid obstructions (such as HVAC, plumbing, electrical, and vent pipes) below the skylight.
In terms of getting the most out of the skylight from an energy-savings standpoint, climate and exposure are also key factors. For example, with a southern exposure, skylights provide an excellent level of passive solar heat during the colder winter months, while keeping cooling costs down during the summer heat. On the other hand, a skylight with a western exposure will increase cooling costs if the structure is in a relatively warm climate.
Skylights can be installed during or after the roof has been installed, but it is in the best interest of the project to plan for a skylight from the early stages of the design phase in order to best accommodate and prepare for the addition of the skylight.
Skylights and LTPs should be guarded to protect from fall through the use of metal railing, nets or some other method of protection.
Last but certainly not least, it must be stated that it is the user’s responsibility to ensure that the installation and use of all light transmitting panels comply with State, Federal and OSHA regulations and laws, including, but not limited to, guarding all light transmitting panels with screens, fixed standard railings, or other acceptable safety controls that prevent fall-through.
For additional information about skylights for metal roofs, please contact MBCI at (877) 713-6224.