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ROOFING INSPECTION & REPAIR - home
AGE OF ROOFING
ASBESTOS & FIBER CEMENT ROOFING
ASPHALT ROOF SHINGLES - home
BEST ROOFING PRACTICES
BUILT UP ROOFS - home
CLAY TILE ROOFING - home
COLD WEATHER ROOF TROUBLE
DEBRIS STAINING on ROOFS
DECKS, ROOFTOP CONSTRUCTION
EPDM, RUBBER, PVC ROOFING
FIBER CEMENT ROOFING
FIBER-WOOD & FIBERBOARD ROOFING
FIRE RATINGS for ROOF SURFACES
FLASHING on BUILDINGS - home
FLAT ROOF MOISTURE & CONDENSATION
HAIL DAMAGED SHINGLES
HEAT TAPES & CABLES for ROOF ICE DAMS
HOT ROOF DESIGNS: UN-VENTED ROOFS
ICE DAM PREVENTION on ROOFS
ROOF DIAGNOSIS & REPAIR - home
LOW SLOPE ROOFING - home
MASONITE WOODRUF FIBERBOARD ROOFING
MEMBRANE & SINGLE PLY ROOFS
METAL ROOFING - home
MODIFIED BITUMEN ROOFING
NOISE CONTROL for ROOFS
PLASTIC ROOFING TYPES
PVC, EPDM, RUBBER ROOFING
ROLL ROOFING, ASPHALT
ROOF ARCHITECTURAL STYLES - PHOTOS
ROOF CLEANING RECOMMENDATIONS
ROOF COLOR RECOMMENDATIONS
ROOF INSPECTION SAFETY & LIMITS
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOF SLOPE DEFINITIONS
ROOFING CONTRACTOR SELECTION
ROOFING MATERIALS, Age, Types
SLATE ROOFING - home
SNOW GUARDS & SNOW BRAKES
STAIN DIAGNOSIS on ROOFS
STANDARDS for ROOFING
STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
TILE ROOFING - home
TRUSS UPLIFT, ROOF
TRUSSES, FLOOR & ROOF
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION, ROOF SPECIFICATIONS - home
WALK-ON ROOF SURFACES
WARRANTIES for ROOF SHINGLES
WIND DAMAGE to ROOFS
WOOD SHAKE & SHINGLE ROOFING - home
Snow retention system building codes? This article discusses standards & codes for snow retention system and answers "no" to the simple question of is there a snow retention system buiding code.
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. We give the reasons for snow & ice retainer use and their history.
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A snow and ice retention system that mounts to a standing seam metal roof by connecting to the roof covering has to resist the forces of snow and ice pressure by transmitting those forces from the snow fence or snow guard to the roof surface and through that roof to the roof mounting clips.
There are building codes for building roof system wind-uplift resistance on metal roofs but there are not building codes that describe the "shear strength" resistance for the fasteners used to secure metal roof panels to the roof deck.
Failures in the mounting system for snow retention devices can occur if the snow retention system is not adequately secured to the building structure itself. Damage to the roof or roof covering can also occur if the total snow and ice load bends or breaks the roof covering (such as a standing seam metal roof).
If the total load causes the roof mounting clips beneath the metal roof to shear. In our OPINION given the total number of clips used to secure the length of a standing seam metal roof panel to the roof deck below, the chances of shearing of all of these roof mounting clip screws, properly screwed to a sound plywood or even OSB roof deck should be minimal.
However it is plausible that high snow and ice loading near the roof edge, imposed against snow guards or a snow fence in that location, could provide a bending force that pulls fasteners out of the roof deck, bending or damaging the roof, and sending snow guards and snow and ice to the ground below.
Adhesive failures are reported by Galow, Anderson, and others as a common snow retention system failure for glued-on snow guards on metal roofs, as we discussed above. 
Structural damage can occur if the snow retention system is not properly located on the roof. See SNOW GUARD SPACING & PATTERN for an explanation of ice dam loading on roof extensions.
The load on snow guards as well as the relationship of snow loading on roofs and the use of snow guard was investigated by Tobiasson (1996) et als. who concluded that improved design guidelines, standards and performance criteria are needed for snow guards on metal roofs.
There are however recommendations for snow retention system installation from the manufacturers of these systems. See SNOW GUARDS on METAL ROOFS for examples.
References for Snow Guards, Installation Methods, Standards
Continue reading at SNOW GUARD PRODUCT SOURCES or select a topic from the More Reading links shown below.
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