There are several websites that sell aluminum bar grating. Local hardware stores may also sell aluminum bar grating.
You can buy decorative burglar bar grating for a Houston home at www.marcospecialtysteel.com/expandedmetal.htm. Another good site is www.hotfrog.com/Products/Security-Bars
Companies that specialize in Grating applications is who you would contact. American Grating is one company that would be able to help you. You would need to contact a local construction company. Find out who their custom grating people are and get a quote.
IAMGP is the install bar grating in Anchorage, AK.
from Accurate Screen, they ship all over north America Paco Corporation is a leading fabricator of grating and stair treads. Paco specializes in custom grating fabrication for small jobs or large facility layouts.
They are not required to use bar grating. They are subject to numerous state and local regulations but this is not one of them. Bar grating is an architectual term for metal bars in an open grid assembly where the bearing bars are spaced by cross bars. This is used in the building design for many buildings including bars an pubs.
Try Edmund Scientific
Bar grating consists of bearing bars and cross rods. The bearing bars carry or "bear" the weight. The cross rods hold the bearing bars together. The cross rods can be welded, press locked, or swaged.
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The extruded bar would be produced by pushing molten aluminum through a die. Where as the other option for making the bar would be to cast it in a mould. The extruded bar would probably have smoother sides and would be available in longer lengths.
An industrial catwalk is normally made of bar grating. Bar grating consists of bearing bars and cross rods. The bearing bars carry or "bear" the weight. The cross rods hold the bearing bars together. The cross rods can be welded, press locked, or swaged.
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Here is a list of a bunch of suppliers that can hook you up with some FRP molded grating: http://www.ecvv.com/product_directory/FRP-Molded-Grating.html .