Consult the snow guard manufacturer for engineering/calculations for each individual roof. Other factors to consider are: designed roof snow loads as well as the roof panel base material, width and configuration. Long panel lengths combined with steep roof slopes are two factors that play into calculating whether or not multiple rows are needed.
Rail-type systems are more likely to use a single row due to the greater holding power versus glue-down pad style. In certain circumstances, multiple rows will be required to properly retain the accumulating snow no matter which system is used. Generically speaking, most continuous rail-type snow retention will be installed in a single row within a few feet of the eave line while individual/pad-style snow guards will be installed in a grid or staggered pattern. Other things to consider are whether or not the system has been independently tested and if the system can be designed/engineered for your specific roof. This will ensure roofline aesthetics for years to come as you won’t have to worry about your snow guards fading at a different rate than your roof panels. Preferred systems will use flat stock panel that has been cut down to slide in the face of your rail/extrusion. Both individual and rail-type snow guards give you the option to color match your roof panel. Rail-type snow guards are commonly manufactured from aircraft quality, high-tensile aluminum and use stainless steel hardware for attaching. Either of these two methods will then use a continuous rail/extrusion that attaches to either the mount or clamp, and will also have a SNO-DAM or a flag that hangs down and rests in the center of the flat of the panel, which will keep snow and ice from sliding under your snow guards. Continuous rail-type snow guards will attach to either a mount that is through fastened into a structural member, for corrugated or through fastened panels, or via clamps that will attach to the seam of a standing seam panel, using non-penetrating setscrews. These pad-style snow guards are typically polycarbonate, and do not usually offer the same strength characteristics of a continuous rail system. Individual snow guards will either adhere to the roof panel via adhesive/sealant or fasteners that penetrate through the roof panel into the structural substrate. There are many configurations of snow guards on the market but individual/pad style snow guards and continuous rail type snow guards, such as DYNA-GUARD, are the two most commonly used in the U.S.īoth can be installed on through fastened panels or standing seam panels. This decision will be based on what type of roof panel you have or perhaps as simple as what type of look you want. When realizing that snow retention is a critical component of your metal roof, your first question is what type to use.
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