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Joist
A joist is essentially a floor support. When you construct a floor, it is not simply sheets
of plywood laid out over a foundation. There is usually some sort of stock below to support
the plywood and the floor. In residential housing, joists can be made of
dimensional lumber or engineered products.
Engineered joists tend to allow for greater open spans, which translates into larger open areas
in the basement, or in rooms on the lower floors. The also tend to produce flatter floors when
the framing is done. These advantages do not come cheap, of course.
Generally, joists are spaced so that they are 16" apart, center to center. For stronger floors
that may need to support heavier loads, 12" on center is not uncommon either. The spacing
depends heavily upon the design of the home, though, as well as the recommendations of your
builder and architect.
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