Secondary Structural



Robertson has a generous selection of secondary structural shapes, sizes, and gauges to fit your every need. Secondary structural framing includes purlins and girts (cee and zee profiles), eave struts, base angles, clips, and other miscellaneous structural parts, which are the members that support the wall and roof panels.

Girts: Wall Structural

A wall structural is a horizontal structural member that is attached to the sidewall or endwall columns and supports paneling.

Zee-GirtZee Girt

A horizontal structural member cold formed from steel sheet in the shape of a “Z” that supports roof covering.



Cee-PurlinCee Channel

A cee or “c”-channel is a member formed from steel sheet in the shape of a block “C”, that may be used either singularly or back to back.




Purlins: Roof Structural

A roof structural is a horizontal structural member that supports the roof panels.

Zee-GirtZee Purlin

A horizontal structural member cold formed from steel sheet in the shape of a “Z” that supports roof covering.



Eave-StrutEave Strut

An eave strut is a structural member located at the eave of a building that supports the roof and wall paneling and may act as a strut to transfer bracing loads to frames.



Long Bay®Long-Bay-Truss

The patented Long Bay® System provides up to 65-ft. of unobstructed column-free spaces to maximize open floor space for design flexibility. Open web truss sub-frames simplify the installation of mechanical and electrical systems and provide roof support. Available with tapered or straight interior columns; sidewall columns may not be necessary for buildings that include completely load-bearing walls. Compatible with tilt-wall or pre-cast concrete, EIFS and curtain wall assemblies, masonry, brick and insulated or single-skin metal wall panels, Long Bay® buildings can ordered with a Robertson standing seam roof or can be used with B-deck for a built-up or single-ply roof.