To fabricate parts in the shop beforehand. To manufacture standard sections that can be rapidly assembled.

The main load carrying members of a structural system, generally the columns, rafters, and/or other main support members.

The initial coat of paint applied in the shop to the structural framing of a building for protection against aggressive environmental conditions during shipping and erection.

A horizontal secondary structural member, bolted to the rafters, which transfers the roof loads from the roof covering to the primary frames.

A projecting secondary member used in roof extensions at the endwall.

The line joining the extreme outer, or exterior, edges of the purlins parallel to the frames.