bar joist

noun
a welded steel joist having an open web consisting of a single bent bar running in a zigzag pattern between horizontal upper and lower chords.
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Example sentences
Only one end of the bar joist he was working on had been welded.
Roof construction consists of steel framing with bar joist and steel roof
  decking.
Remove materials, sound roof for rafters or bar joist, then cut decking and
  remove.
The roof structure is usually lightweight steel bar joist or metal deck roof.
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