However the weight of snow and ice trying to slide down the roof - the load - is carried by the roof covering, and is transferred to the roof structure only by the metal roof mounting clamps beneath the roof surface. Of course clamps mount on standing seams of metal roofs, not other roof surface shapes. The clamp mounting method for mounting snow guards & fences is also quite strong and has the advantage of avoiding penetrations of the roof surface. Clamp-on snow retainer mounts: for standing seam metal roofs, various patented clamps secure to the raised rib portion of the standing seam and in turn provide a base for mounting snow shoes, snow guards, or snow rails or fences.Watch out: depending on the total loads imposed by snow and ice on a roof, failures are still possible with structurally connected snow retainer systems if the screws, bolts, or their connection points are not adequately designed & installed on the roof. Structurally-connected snow & ice guard system mounts should be used where the loads (weight) of snow and ice are very great such as on large roofs or in deep-snow areas, or where the snow rail is itself large and heavy. For steel roofs the retainer mount may be welded to the roof surface.įor slate, tile, or shingle roofs, the leak risk of this approach can be minimal as the fasteners can be covered by subsequent courses of roofing material.įor metal roofs we prefer not to puncture the metal roof surface. Structurally-connected snow retainer mounts: A snow retention device or its mounting bracket is fastened through the roof surface to the underlying roof sheathing or framing structure.Our photo (left) illustrates structurally-mounted snow brakes or rails on a tile roof covering the Oslo Folk Museum.Īs Norway experiences heavy snow fall, you will observe that the snow brakes are installed in two tiers and a close examination shows that the rail brackets are secured to the roof structure below. Individual snow guard mounting methods vary depending on the roof covering material.Īll snow retention systems use one of these methods to provide snow and ice retention for building roofs. We give the reasons for snow & ice retainer use and their history. This article series illustrates types of snow guards or snow brakes or other snow retention devices used on metal, rubber, asphalt, and slate roofs and we explain and illustrate in photographs just how and where these devices are attached to building roofs. 5 Snow Retention System or Snow Guard Installation Mounting Methods We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Snow guard mounting approaches: five approaches to mounting snow retention systems on roofs or using snow-retention coatings, brakes, clamps, and similar devices are described here.ĭetailed procedures for clamping or gluing snow guards to roofs are in companion articles listed here as well. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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