Gable steel lookup uses the entered width. Rafter length and roof area use the entered slope.

Mono steel lookup uses the entered width. Empty or 0 rise is flat; purlins have no center ridge beam.

Polygon Roof supports Pyramid, Hexagon, and Octagon. Steel lookup uses the larger of length or width. Purlin rings include the outer edge and use equal spacing from edge to spider.

Pyramid is one top and one bay with four posts. Rectangles and squares are allowed; the centered peak rise follows the entered width and slope.

Hip uses one continuous ridge calculated as Unit Length minus Width. Bays control the supporting post and rafter lines.

T-Bar uses one centerline post at each bay division. Crossmember keeps posts at entry height; Peak extends posts to the calculated roof peak.

Cantilever-Curved uses post-to-post bay length, cantilever projection, and wedge angle to calculate each purlin length. Overall Widest Length is the greatest straight-line span between any two posts, with no roof overhang. All rafters share one steel size and all purlins share one steel size.