A living room measuring 7m x 4m uses 2"x2" ceiling joists The total board foot of ceiling joists that is required to cover the entire room is 176.66 bd. ft. If there are already 19 pcs. of 2"x2"x14' ceilinig joists available at the site, how many pieces more of 2"x2"x12' are needed to cover the entire ceiling joists requirement of the room?

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Sizing Joists and Rafters

In civil engineering and building construction, joists and rafters are the major components including beams and columns. Almost every structural construction including buildings, skyscrapers, bridges, commercial complexes, and so on makes use of joists and rafters to provide structural integrity to the building. Joists are primarily thick long pieces of metals, concrete, or wood that are used to support the floor and ceiling. On the other hand, rafters form the major component of pitched roofs, which are a series of sloped long pieces extending from a ridged area that makes contact with the plane area of the wall. They account for the load-bearing of the building along with the beams.