2 apply dead load using the weight of framing material roof covering and fixed elements of the gable roof.
Snow load gable roof.
C s roof slope factor p f flat roof snow load.
Figure 7 1 pages 84 85 and table 7 1 page 92.
Length of roof upwind of the snow drift.
Ground snow load pg.
When the roof slope is greater than 5 the roof is considered sloped.
From eave to ridge w.
Length of roof downwind of the snow drift.
With overhanging eaves feature four medium pitched sides and are characteristic of dutch architecture and help disperse snow loads in northern climates.
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.
For hip and gable roofs with slope exceeding 7 on 12 30 2ยบ 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.
Framing table for maximum roof rafter spans.
Multiply loads such as 20 pounds per square foot by the square footage of the roof.
Hipped roofs are often used in complex roof formations with the hips facing different.
Length of high roof lu.
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.
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.
The sloped roof snow load is calculated using equation 7 4 1.
Roof slope factor c s.
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.
Snow accumulation requirements must be detailed by the building designer.
P s c s p f where.
Since trusses are designed as individual planar components snow loading conditions that go beyond the simple unbalanced load case on either side of the ridge on gable roof trusses must be detailed by the building designer.
In practice i found when a building only has a single valley on one side of the roof the unbalanced snow ussually governs.
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.
Horizontal distance from eave to ridge.
A gable roof is a traditional triangle shaped roof that can range from a medium pitch to.
Snow accumalates in valleys and may be a major design concern.
