Sloping semirigid diaphragms are allowed in the program. Note that this requires that decks must be redefined in the modeler (each sloped plane must be modeled as a separate deck polygon). In the following example, roof floor is defined as sloped as indicated in Plane view of sloped roof floor (note that columns are lowered at top and bottom perimeter lines and other columns at center are not). In order to correctly define sloped roof, two separate deck polygons are modeled ( Each deck polygons uniquely define a sloped plane ) and each deck polygon represent a unique sloped plane. The program automatically calculates sloped plane coordinates based on members (columns, walls, etc…) located inside each deck polygon. And finally, Model with sloped semirigid diaphragm shows sloped roof model.

Any loads (dead, live, snow or roof loads) on sloped diaphragms are also corrected due to sloped planes (live loads computed on projected areas and dead loads are computed according to true sloped areas).