By Brion P. McMullen, Bio
SnoBlox-Snojax was recently asked by a homeowner to consult on a snow guard failure in Wisconsin. Unfortunately, when the system failed, it damaged the roof panels so severely that the entire roof is now being evaluated for replacement after just three years. Our goal is to identify the contributing factors of the failure and to design a proven snow guard system that will last the life of the new roof.
As you can see in the pictures, the contractor used 1.5”aluminum angle to fabricate a makeshift bar system on a 9” r-panel. The make shift snow bar was pre-drilled and roofing screws were used to mechanically fasten through the major ribs and down into the sub roofing. The roof has a 6/12 pitch and only one row was used on this 50psf ground snow load project. The system made it 3 years before failure and possibly ruining the entire metal roof.
These types of homemade snow retention systems are very common and have a very high failure and roof damage rate. The strength of this type of Snow Guard system is limited due to the attachment method and deflection strength of the under-designed aluminum bar. This system also failed to equally distribute the snow load across the roof area while controlling the live load.
Solution : Once the customer has his new roof installed or repaired, he will have a couple of options. The first will be an adhesive or screw mounted SnoBlox-SnoJax polycarbonate system comprised of multiple staggered rows of snow guards designed to equally distribute the snow load across the roof area and control the live load.
His other option will be a properly designed and installed SnoBar or ColorBar system. We are able to use screw down brackets for r-panels and non-penetrating clamps for standing seam panels. Each of these options are covered by our lifetime warranty.
We will keep you posted on the new roof and snow guard system replacement in the coming weeks.