Thumb rule for sizing joists | rule of thumb for joist spans, Joists spacing, joists span calculator

Thumb rule for sizing joists | rule of thumb for joist spans | Joists spacing | joists span calculator
The rule of thumb that I like to use when sizing uniformly loaded residential floor joists is "half the span plus two." First, round the clear span of the floor joist up to the nearest foot, and divide by two. Then add two to the answer. This will give you the depth (in inches) of the required floor joist.
For example, assume the clear span is 15 feet 6 inches. Round up to 16 and divide this span by 2, giving you 8. Next, add 2 to get the required joist depth. In this example, 8 + 2 = 10, so a 2x10 floor joist will be required
Typically, residential floor loads are assumed to be 50 pounds per square foot (40 pounds live plus 10 pounds dead), spacing between joists 16" on center, deflection limits L/360 and this rule of thumb will work for loading conditions that don’t exceed that value.
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