Snow Shed Roof

Slopes greater than 6 12 will tend to shed snow regardless of the texture of the material on them so roof slopes should be configured to avoid shedding anywhere people might be walking or exiting.

Snow shed roof.

Pooling water on a roof can cause leaks and other damage. Since a shed roof generally has a much steeper slope it usually lets the water roll right down it and over the edge. A simple roof to construct but slightly more expensive than the skillion due to the lower slope needing waterproofing. This snow load kit is not necessary under normal snowfall conditions.

Lifetime shed from 16 psf without a snow load kit to 30 psf with snow load kit reinforcements. They can be made of steel prestressed concrete frames or timber. If you experience excessive snowfall in your area you can increase the snow load capacity of each roof truss of your 11 ft. Your equation for determining snow load s x 1 25 p is fairly straightforward math.

It makes sense when designing a metal roof to shed snow not to keep it on. It has a lower profile than the skillion or gable so may be more suitable to some neighborhoods. A stick framed roof uses 2x4 s or 2x6 s or whatever you are framing with but has a ridge board running down the middle ridge line. People have been killed by snow avalanches sliding off roofs during big snow winters.

Some metal building manufacturers will not warranty a roof with a 1 4 inch slope. S equals the depth in inches of the snow on your roof and p represents the pounds per square foot your roof is supporting. You then have rafters running down from this ridge board and resting on the top wall plates. Lots of built up snow adds extra weight to the roof that can also cause damage so shedding water and snow more efficiently is a definite advantage.

When the snow piled up on the roof melting occurred and ice dams resulted in water ponding 3 inches deep. It does shed rain and snow shed more easily with the greater slope. Each kit reinforces one roof truss. With expansion and contraction of the metal it is difficult to attach snow retention devices into the roof decking without causing a roof leak or slotting of the metal panel from the snow bracket fastener.

Metal roofs leak under these circumstances. Needed for severe weather conditions only. A snow shed snow bridge or avalanche gallery is a type of rigid snow supporting structure for avalanche control avalanche defense or to maintain passage in areas where snow removal becomes almost impossible. These structures can be fully enclosed like an artificial tunnel or consist of lattice like elements.

To calculate the snow load on your roof assume that every inch deep of snow equals 1 25 pounds.