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Floor Joist Sizes & Spans – 16″ spacing – 30 psf

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Calculating the size of the floor joists you need when building a home or an addition is not a complex situation as we have provided a chart that will allow you to make your selection.

Note: Always check with your local building department to ensure that your choice of floor joist size and material meets their requirements.

Four charts are provided:

  1. 40 psf and 12″ spacing
  2. 40 psf and 16″ spacing
  3. 30 psf and 12″ spacing
  4. 30 psf and 16″ spacing
floor joists - 30 psf - 16″ spacing - part 1
floor joists - 30 psf - 16″ spacing - part 2
floor joists - 30 psf - 16″ spacing - part 3