Snow Load Gable Roof

One reason may be that the current unbalanced snow load provisions for gable roofs is much higher then what was required by some codes in the past.

Snow load gable roof.

Ground snow load pg. Length of high roof lu. Length of roof upwind of the snow drift. Let s look at the sample table below which shows maximum rafter spans for a snow load of 31 3 pounds per square foot psf.

With overhanging eaves feature four medium pitched sides and are characteristic of dutch architecture and help disperse snow loads in northern climates. Multiply loads such as 20 pounds per square foot by the square footage of the roof. When the roof slope is greater than 5 the roof is considered sloped. A gable roof is a traditional triangle shaped roof that can range from a medium pitch to.

From eave to ridge w. Does this mean that if i have a gable roof sloping at say 25 degrees i e the 30 degree minimum slope where snow load can start to be reduced due to sliding that the total i e. C s roof slope factor p f flat roof snow load. The sloped roof snow load is calculated using equation 7 4 1.

Hipped roofs are often used in complex roof formations with the hips facing different. Horizontal distance from eave to ridge. Pounds snow load on a sloping roof is the same as the total snow load on a horizontal roof of length equal to the horizontal projection of the sloping roof. 2 apply dead load using the weight of framing material roof covering and fixed elements of the gable roof.

Length of roof downwind of the snow drift. Snow accumalates in valleys and may be a major design concern. Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24. Depending on your region you may need to design for a maximum snow load of anything between zero to 65 pounds per square foot or roughly 0 3 kpa.

Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface. Figure 7 1 pages 84 85 and table 7 1 page 92. Framing table for maximum roof rafter spans. For hip and gable roofs with slope exceeding 7 on 12 30 2º unbalanced snow loads are not required to be applied 15 unbalanced loads gable roof upper limit roof slope lower limit roof slope small eave to ridge distance 16 unbalanced lower limit slope in 7 05 lower limit was complicated slopes less than larger of 70 w 0 5 and 1 2 on 12.

P s c s p f where. Length of low roof ll. In practice i found when a building only has a single valley on one side of the roof the unbalanced snow ussually governs.