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Girder vs. Joist

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Main Difference

The main difference between Girder and Joist is that the Girder is a main horizontal support of a structure which supports smaller beams, often with an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape and other forms and Joist is a horizontal structural element transferring load from flooring to beams, typically running perpendicular to beams.

Wikipedia
  • Girder (noun)

    A beam of steel, wood, or reinforced concrete, used as a main horizontal support in a building or structure.

  • Girder (noun)

    One who girds; a satirist.

  • Joist (noun)

    A piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed.

  • Joist (verb)

    To fit or furnish with joists.

Wiktionary
Oxford Dictionary
  • Girder (noun)

    One who girds; a satirist.

  • Girder (noun)

    One who, or that which, girds.

  • Girder (noun)

    A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence, a framed or built-up member discharging the same office, technically called a compound girder. See Illusts. of Frame, and Doubleframed floor, under Double.

  • Joist (noun)

    A piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed; - called, according to its position or use, binding joist, bridging joist, ceiling joist, trimming joist, etc. See Illust. of Double-framed floor, under Double, a.

  • Joist

    To fit or furnish with joists.

Webster Dictionary
  • Girder (noun)

    a beam made usually of steel; a main support in a structure

  • Joist (noun)

    beam used to support floors or roofs

Princeton's WordNet

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