Select the on center spacing for the joists.
Floor joist calculator load.
The highest is a fully loaded floor 70 pounds per square foot.
Span calculator for wood joists and rafters also available for the android os.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
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.
In this case your joists are adequate to support a 30 psf live load and 10 psf dead load.
Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.
Floor joist span calculator.
Live load is weight of furniture wind snow and more.
The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
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.
There are six choices.
1 psf lb f ft 2 47 88 n m 2.
Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span.
Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
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.
Maximum floor joist span for no.
This is how far apart they will be.
2 grade of douglas fir are indicated below.
To use the joist span calculator below first select the species of lumber you will use for your construction project from the drop down list.
Dead load weight of structure and fixed loads 10 lbs ft 2.
