When using clamps to attach accessories to a standing seam roof the applications are virtually endless. From snow retention and solar panels to signage, HVAC units and even stabilizing gas piping, standing seam clamps are used to keep the units in place.
Knowing which clamp to use for a specific accessory is imperative
When using clamps to attach accessories to a standing seam roof the applications are virtually endless. From snow retention and solar panels to signage, HVAC units and even stabilizing gas piping, standing seam clamps are used to keep the units in place.
However, knowing which clamp to use for a specific accessory and how the clamps carry the load is critical to durable performance. For example, the Dyna-Clamps used for snow retention have two attachment setscrews, which when properly installed and torqued, keep the clamp from migrating down the seam when under a load.
Testing of clamps for snow retention should be done on a variety of panel types and manufacturers. This testing information will aid in calculating how many clamps are needed and the pattern in which the clamps need to be installed to properly handle the loads required for a specific project.
When planning for rooftop attachment of accessories such as solar panels, the clamps used are a “mini style,” which involves only one setscrew for attaching the clamp to the standing seam. A word of caution: this type of clamp should not be used for snow retention management systems. Mini-style clamps are used for mounting applications where the load from the accessory being mounted on the roof transfers to the structural members of the roof system.
In both instances, the clamps described here will also have accessory mounting holes that will allow multiple options for attachment.
Maximum Loads
When it comes to testing clamps on various panels, there’s a wide range of ultimate load values. The weak link/failure of the system being tested is typically the panel seam itself. With respect to the multitude of various 24-gauge panel seams tested in third-party independent labs, Dyna-Clamp values range anywhere from 650 pounds ultimate all the way to 3,000 pounds ultimate. Additional determining factors in clamp load values include panel type, profile and thickness.
Using the proper clamp specific to the standing seam profile is imperative. If the selected clamp doesn’t fit the configuration of the standing seam appropriately, the holding capacity of the clamp will be compromised. Installing the wrong clamp can also cause extensive damage to the roof panel.
Jerod Webber is a sales manager for Dynamic Fastener, Kansas City, Mo. To learn more, visit www.dynamicfastener.com or call (800) 821-5448.
