Sloping Beam Method vs Horizontal Plane Method
When computing the combined load to the rafters in the roof, the different lengths of the dead and snow loads must be taken into account. In addition, the shear and moment in the rafters may be combined using the sloping beam method or the horizontal plane method. In the sloping beam method, the gravity load is resolved into components that are parallel and perpendicular to the member. The values of shear and moment are based on the normal (perpendicular) component of load and a span length equal to the full length of the rafter. In the horizontal plane method, the gravity load is applied to a beam with a span that is taken as the horizontal projection of the rafter.
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