JOIST

v. put floor beams in place

n. beam that supports a floor

A joist, in architecture and engineering, is one of the horizontal supporting members that run from wall to wall, wall to beam or beam to beam, to support a ceiling, roof (or floor). It may be made of wood, steel or concrete. Typically a beam is bigger than a joist and thus is distinguished from a joist. Joists will often be supported by beams, and are usually repetitive. Joists support the sub-floor (floor deck) directly.
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Noun
1. beam used to support floors or roofs
(hypernym) beam
(hyponym) floor joist

(v. t.)
To fit or furnish with joists.
  

(n.)
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.
  

n.
کڑي , سوت, دھني