Table notes spans are based upon continuous support of compression flange over the full length of the joist.
Floor joists for 13 foot span.
The table below shows the maximum span for a floor joist with the following designations.
Our joist span charts are for wood joists with a maximum dead load of 10 pounds per square foot and a live load of 40 pounds per square foot.
2 grade of douglas fir are indicated below.
The house will have a gable roof and will be framed with wood studs.
The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example.
In the table above the widest floor beam span for 12 of supported floor joists is 14 7 if using a 5 ply 2 x 12.
Douglas fir larch lumber species no.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
The illustrations one for cantilever joists and one for flush rim beam hung joists point out where joist span measurements are taken from the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the.
Rafter and joist span faq.
Let s start with a simple very small house 12 feet wide by 13 feet long.
So we now have adequately sized floor joists and an adequately sized floor joist beam for our 24 x 13 house.
If you have any questions.
1 ft 0 3048 m.
Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.
Live load represents the weight of furniture snow etc.
Span calculator for wood joists and rafters also available for the android os.
Our floor joist beam can span a maximum of 13.
This chart is for basic reference only.
Maximum floor joist span for no.
Floor joist span tables for various sizes and species of wood.
Dead load is the weight of the structure and any fixed items.
For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine.
Live load is weight of furniture wind snow and more.
1 psf lb f ft 2 47 88 n m 2.
Calculated allowable properties are based upon aisi s100 07 north american specification for the design of cold formed steel structural members.
2 lumber grade all joists are bridged sample floor joist span.
For two equal spans the listed span is the center to center distance from either end to the center support.
Also available for the android os.
Dead load weight of structure and fixed loads 10 lbs ft 2.
