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WoodWorks Sizer uses the following assumptions for sloped members:
Level Bearing
Level bearing is assumed and thus there is no horizontal thrust at supports. Sloped members are only designed for flexure. It is assumed that axial force due to self-weight is insignificant in these members.
Bearing resistance is calculated at an angle to the grain.
Joist Spacing on a Slope Member
Joists supported by sloped members are spaced with respect to the longitudinal axis of the member.
Load Projection
Wind , Dead, and Earthquake line and area loads are distributed along the longitudinal length of the member while all other load types are applied along the horizontal projected length.
Sizer assumes that Wind loads are applied perpendicularly to the surface of the member, while the other load types are applied vertically.
The consequences of these assumptions is discussed in more detail in Sloped Member Load Direction and Projection
The start/end location of the load entered by the user is considered to be the distance along the horizontal projection of the member.
Lateral Support Spacing
Lateral support input is based on horizontally projected length. Sizer automatically converts lateral support to length along the longitudinal axis.