The standard recommended by NAAMM is a maximum 1/4" deflection under a uniform load of 100psf.
Yes. Bar grating is manufactured to the standards set by American National Standard Institute/National Association of Architectural Metal Manufacturers (ANSI/NAAMM). For more information go to www.naamm.org.
Ohio Gratings offers a complete line of close mesh heavy duty steel grating called Wheel n' Heels that meets both ADA and AASHTO load requirements.
Steel grating dipped in black paint only protects the product against rusting during shipping and installation. A galvanized process is required to permanently protect the grating during its life cycle.
The span is the distance between two points of grating support and is actually referred to as the length of the grating. This is also the direction of the bearing bars.
Pressure-locked means bearing bars are locked in position by cross bar deformation instead of welding or riveted. OGI offers Swaged and Dove Tail pressure locked products.
Trim band carries no load and is used to improve the appearance of the product. Welding is done every 5" at the end of the panel. Banding can in fact help carry the load if welded at every bearing bar and is especially recommended for heavy duty grating.
The length is the actual span of the opening (this is the direction of the bearing bars) and is multiplied by the lineal feet or "run" of the opening to calculate the overall square footage.
To allow for smooth travel over the grating by those individuals who are wheelchair handicapped.