Snow breaks, or snow rails, are roof-mounted at spaced intervals in two or more rows near the edge of a roof. The idea being, that as snow and ice back up against the guards, it will freeze and create a dam. The ice dam will then prevent the mass of snow from falling off the roof all at once. While all agree how snow breaks are supposed to work, how do installers choose among the many different designs? Choose a product that\’s face is big enough to hold the snow, anywhere from 2.25 inches high and 3 inches across. Some believe that snow breaks are better with a flat face rather than a pointed design. The thinking is that the latter is more decorative than functional and does not hold back the snow as well.
The height and shape of the face of snow breaks determine their ability to hold back layers of ice and snow. Snow guards need to be placed in the lowest portion of a roofing panel where snow and ice actually moves. The flat surface should stand at least the height of the seam, creating a connected field to hold snow and ice stationary until it can melt off safely. This will then protect your family and possessions damage of falling snow and ice.
The proper number and correct placing of the snow rails is important for a snow breaks system to work properly. Manufacturers should provide tested spacing layouts based on the pitch of the roof, panel runs from the ridge to the eave, panel widths and profile, and the snow load the home is designed for. Using these layouts, installers can easily take a tape measure and mark out where snow guards should be mounted.
Snow rails can be installed on the roof surface either with mechanical fasteners, adhesives, or tape. The adhesive mounting method is best used on floating-type standing seam metal roofs, because it doesn\’t restrict normal thermal expansion and contraction of roof panels. They are also easy to remove without damaging the panels or seams. Tape fasteners should only be used as a temporary solution.
Finally, you have a large assortment of materials for snow breaks. Metal guards are offered in colors that match roofing panels. However, the visual advantage of color-matching can be offset by the \”sundial effect\” of upright metal snow guards casting shadows on the roof. Metal guards also can grow to be brittle in cold weather, and can produce galvanic reactions, which produce rust. Another choice of material is clear plastic, including polycarbonates that are stabilized against ultraviolet rays to reduce yellowing and cracking. The material does not cause rust and, because it is clear, does not cast shadows. On the other hand, home-owners and architects can color-match the plastic snow guards to their roofs, yet color-matched guards and roof panels can fade differently over time.
If you think snow breaks may help protect your home, then check online or ask locally for information and deals.
Want to find out more about snow rails, then visit Esme Spence\’s site on how to choose the best snow breaks for your needs.