Height Of Floor Joists
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Height of floor joists. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. Maximum floor joist span for no. 2 grade of douglas fir are indicated below. See the image below for an example of joists spaced 16 on center 16 o c.
Two by 6 inches is a joist size frequently used in both indoor floors and as deck joists. True floor joist span calculations can only be made by a structural engineer or contractor. 1 psf lb f ft 2 47 88 n m 2. Even though we use 1 pt lumber the joists are often slightly warped or vary in depth at times causing adjacent joists to differ in height by as much as 1 2 inch or more.
Setting the joists perfectly level at the house is easy and the beam makes them fairly even near the front edge but the problem is in the middle. If you re figuring the total height of a house the thickness of the floor will depend mostly on the size of the joists. 1 ft 0 3048 m. Standard floor thickness however is substantial in order to provide the strength necessary for bearing the weight of the walls the ceiling and the roof.
In joist sizes the larger size such as 6 inches represents the height of the joists while the 2 inch size represents the joist width or the area on which the floorboards sit.