![]() This style also relies upon the shear strength within a snowbank to “bridge” between the individual units.īoth styles of snow guards (fence and cleat) have demonstrated satisfactory performance when tested, engineered, and installed properly and adequately. ![]() The other design consists of small, discontinuous individual units used as “cleats,” generally spot-located at or near the eave or repeated in a pattern progressing up the slope of the roof, again with a greater concentration near the eaves. Depending on specific job conditions and load-to-failure characteristics of the devices, they may also be repeated in parallel rows up the slope of the roof, but with greater concentration near the eave area. One utilizes continuous horizontal components, assembled laterally across the roof in the style of a “fence.” Such assemblies are usually installed at or near the eaves. System Design: Two snow guard system designs are quite common. Snow guards rely on compressive strength of the snowbank (greatest at snow-roof interface and lower end of the roof). The interface of snow retention devices at this location has proven to be strongly preferred worldwide and considered to be most effective. Gravitational forces compress the snowbank mostly at its interface with the roof surface, especially toward its lower (eave) end-so this is where compressive strength is greatest. All snow guards rely on the snow’s own compressive strength to restrain its movement. Snow Retention Population and Placement: Snowbanks typically accumulate and densify in a cross-sectional wedge pattern. Snow Retention System Design Considerations These three factors determine the vector force that a system must resist for any roof surface and should be included in plans and specifications requiring an engineered system. The service loads applied to a snow guard system are a relatively simple calculation, varying with site specifics, all of which should be known to the design team: 1. The forces of snow on your rooftop can be mathematically calculated, and should be for any snow guard system. ![]() Vector (PSF) = Vertical (PSF) x Sine of Roof Angle Vector (Pounds per Panel) = Vector (PSF) x Roof Length (Ft) x Panel Width (Ft) Understanding the Math & Science System testing must prove strength of system exceeds this calculated force. This is particularly important in places where heavy snowfall occurs during winters.This calculation should be done for any snow retention system. Installing metal roof ice guards on metal roofs is the best way to ensure an avalanche does not occur after snow or icy conditions. How Do You Keep Snow from Sliding Off a Metal Roof? Since snow guards they are intended to last the entire lifespan of the roof, it’s recommended not to glue them on but to attach them mechanically. Some things to keep in mind when installing a metal roof snow guard is that you should pay attention to the manufacturer’s instructions. then then go up about 8 feet and continue to place your snow guards in the same staggered pattern as you did at the bottom edge. This is where most of the snow piles up as the sun causes it to melt and slide towards to bottom half of the roof.īeginning at about 6 inches above the bottom edge of your roof, place two snow guards evenly spaced out in a staggered pattern across the entire roof. If you are going to use a rail-type system, install your snow guards approximately 1 to 2 feet from the eave.
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