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Written by; Joy Smithers / TCCN Staff Writer
Added on: Sun Jun 28 2009


A joist is a horizontal supporting member running from one wall to another, a wall to a beam, or from a beam to a beam. The larger the span of a floor, for example, the more floor joists will be necessary. Joists can be made of concrete, steel, or wood. To determine how far joists should be spaced, divide the span of the floor in feet by two, then add two to that number. That will give the number of inches apart the joists must be, even though the floor span is calculated in feet. For wider spans between supporting structures like walls, the joists have to be deeper in order to successfully support the load.


Copyright: 2009

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