Bar grating is the term given to a series of metal bars or gratings that have been welded, swaged, pressure locked or riveted together. The load bearing bars are positioned vertically an equal distance apart and joined by cross bars which form a rectangular pattern.
Bar grating has a wide range of uses as walkways, platforms and mezzanine decking, barriers, drain grates, stair treads and more. It is able to provide a safe and durable solution for these application needs while providing the flexibility of construction adaptation. Materials commonly used to construct bar grating include aluminum, steel, stainless steel or high strength fiberglass or fiber reinforced plastic.
The most common spacing formation for bar grating is rectangular; however, diagonal bars may also be used to reinforce the structure resulting in a diamond-like configuration. There are a number of standard spacing options which are dependent on the application for which the grating is being used and the specific requirements in terms of load bearing, strength, porosity and surface demands.
However, many manufacturers are able to adapt the spacing in order to meet custom loading or area requirements. Other factors which can be adjusted include panel sizes, bar shapes and sizes and method of joining.
Different types of joining methods include: welding, swaging, riveting and locking. Welded bar grating is the most commonly found as it is a cost-effective and high strength option. It is easy to adjust to a specific area and is straightforward to install. The parallel bars and cross bars are welded together at their contact points through the application of high heat and pressure, creating a strong and permanent bond.
The resulting grid is rigid. In terms of safety, the openness of welded bar grating maximizes air, light, liquid and sound circulation thus expanding the range of uses for which the metal grates can be used. When joined by welding processes, metal bar grates can vary in terms of bar dimensions and spacing.
Press-locked grates are those notched and forced together under pressure and are often used in architectural applications due to the aesthetically appealing nature of the resulting pattern. Press-locked methods are not as permanent as welding method and yet still result in a high-strength grate.
Using bar grating is a cost-effective solution to many grating, structural support, filtering and safety needs. They provide a strong and durable product that is often less costly, both in terms of initial output as well as in long term maintenance and repair.