Interstate Grating Products

Banding

As manufactured, grating panels are provided with open ends. Optional trim banding, a metal flat bar welded to the open ends of the panel, provides additional transverse stiffness and a finished architectural appearance. Banding should be specified for all removable grating panels, the closed end of a banded panel providing additional worker safety during the removal and replacement process.

Gratings subject to vehicular loads should always be specified as banded. In these applications, the band bar helps reduce impact stresses by transferring loads to adjacent bearing bars and further resists deformation caused by repetitive traffic patterns on open end gratings.

Trench banding, where the band bar is elevated above the bottom of the bearing bars, is appropriate for drainage applications. The elevated band bar allows for efficient drainage and will not trap liquids between the band bar and the grating support.

Load banding, where each bearing bar is welded to the band bar, helps distribute load throughout the grating panel. See Banding Weld Standards for specific welding practices.

Standart Grating Trim Banding Trench Banding


Grating Banding


Banding Weld Standards

Layout

Stock grating panels are manufactured in nominal 24" and 36" wide panels. These sizes allow for efficient layout and waste minimization when fabricated to your exact specification. Unlike competing grating products, individual grating panels do not require supports on all four sides of each cut piece.

Grating Panel Layout

Fasteners

Welded Installation

All grating must be firmly fastened in place and welding panels to the supporting structure provides a superior, permanent installation. The diagram below indicates the recommended minimum weld size and spacing for pedestrian applications. This minimum spacing also applies to pedestrian applications where mechanical fasteners are specified. Vehicular applications typically require additional welding, size and spacing as determined by the specifying authority.

Minimum Weld Pattern

Metal Bar Grating Panel

Saddle Clips

Bent clips bridging two bearing bars, available in galvanized steel, stainless steel or aluminum. Standard bolt holes are 5/16" and bolts, screws or other connecting hardware shall be supplied by others.

Grating Saddle Clips

“G” Clips

Mechanical fasteners that are installed on the top surface of the grating and create a friction connection with the flange supporting the panel. "G" clips are easily installed without drilling or welding.

Grating G Clips

 


Bar grating panels only require support perpendicular to the bearing bar span. There is no need to place supports parallel to the bearing bars where adjacent panels are installed in succession. The following diagrams illustrate proper layout and support of a simple bar grating platform.

Metal Bar Grating Panel

Grating Banding

Weld Lugs

Plates punched with holes and shop welded between the bearing bars to facilitate bolting to the supporting structure. Bolts, screws or other connecting hardware shall be supplied by others.

Grating Fastener: Weld Lugs

Countersunk Lands

The narrow spacing of close mesh gratings allows for countersinking or milling of the bearing bars to support bolt shoulders. Flat head screws or self-drilling fasteners shall be supplied by others.

Grating Fastener: Countersunk Lands