Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Floor joist live load calculator.
Bc calc performs engineering analysis to help our customers size beams joists columns studs and tall walls for their building projects.
Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches.
Most lay outs are on 16 so the field is pre selected.
This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.
2 grade of douglas fir are indicated below.
In this case your joists are adequate to support a 30 psf live load and 10 psf dead load.
Span calculator for wood joists and rafters also available for the android os.
1 psf lb f ft 2 47 88 n m 2.
Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.
First check the local code for allowable live load dead load and deflection see figure 2.
There are six choices.
Live load is weight of furniture wind snow and more.
For this example i ll use the cabo one and two family dwelling code which serves as the model for many state and local codes.
The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
1 ft 0 3048 m.
It is simple to use yet flexible enough to analyze a variety of common applications.
True floor joist span calculations can only be made by a structural engineer or contractor.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Select the on center spacing for the joists.
While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
Live load psf dead load psf exterior exposure.
The highest is a fully loaded floor 70 pounds per square foot.
Maximum floor joist span for no.
Step 1 check the code.
The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000.
The user enters the member geometry adds loads holes and other relevant data and then selects a product for analysis.
