wood Floor Joist Span Charts

These handy floor joist span charts will give a quick general reference only to the allowable span of the following U.S. species mixes. Douglas Fir & Larch, Hemlock & Fir, Southern Yellow Pine. Each chart is based on a different weight loading.

These weight loadings are the live Load in pounds per square foot (Live Load refers to a load that can vary, furniture, people, movable objects) and a Dead Load in pounds per square foot (Dead Load refers to fixed material weights, joist material, flooring, any part of the structure or permanent fixtures) These different charts reference a particular type of design and weight loading.

These span charts are made available as a quick reference only. We advise you to confirm proper engineering for your particular project with a certified local engineer. This website makes no claim as to the accuracy of these span charts and will not be held liable for any use of this information.

SLEEPING ROOMS-ATTICS 30 PSI LIVE, 10 PSI DEAD

ALL ROOMS EXCEPT SLEEPING ROOMS AND ATTICS 40 PSI LIVE, 10 PSI DEAD

OFFICE SPACE 50 PSI LIVE, 10 PSI DEAD

ALL ROOMS 1.5" OR LESS CONCRETE FLOOR FILL 40 PSI LIVE, 20 PSI DEAD

Wood Floor Joist For Office Space

OFFICE SPACE 1.5" OR LESS CONCRETE FLOOR FILL 50 PSI LIVE, 20 PSI DEAD