The test beam was roughly 9 ft (2.7m) long, 5.375 in (137mm) wide and 4 inches (102mm) in depth, made from welding two S4x7.7 stainless steel i-beams together, with the prepreg CFRP beam — measuring ...

Q. I’m getting ready to build a large room addition that needs a beam to support the floor joists. I’ve been told that a wood beam will work, but I’ve always seen steel I-beams in other houses.

Much of the growth is due to a castellated steel beam division, which sparked an expansion with a new 100,000-square foot warehouse on 28 acres.