Span tables below illustrate common combinations of the multiple variables available.
Structural floor loading span calculator.
The load on an outside wall with clear span trusses is exactly half the load on each wall.
Loads are considered to be either distributed or point loads.
1 psf lbf ft2 47 88 n m2.
Floor truss span chart each individual floor truss design is unique based on multiple variables.
Maximum floor joist span for no.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Dead load weight of structure and fixed loads 10 lbs ft2.
In this case your joists are adequate to support a 30 psf live load and 10 psf dead load.
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.
There are two different types of loads.
Determine the beam header span length and the span carried supported by the beam header.
Live load is weight of furniture wind snow and more.
Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing.
The column on the left of each chart labeled beam span represents the beam length with bearing required for your project.
Distributed loads are specified in units of force per unit length kn m or plf along the beam and can be applied between any two points.
Its either going to an exterior or an interior load.
Roof rafter framing of the residential structural design tutorial.
Dead load psf span calculator for wood joists and rafters available for the iphone.
Use span tables for progressively heavier loads until you find the limits of your floor.
Geometry loading spacing bearing conditions etc.
For sawn lumber you must perform mathematical calculations.
Each load can be named by the user.
The calculator supports a variety of different loading types which can be applied in combination.
Span calculator for wood joists and rafters also available for the android os.
Click on the appropriate beam this will take you to the calculation table for your project.
To use the beam span calculator below first select the number of floors that the floor beam will be supporting from the drop down list.
Engineered wood components are sized using span tables that match various spans to pounds per foot of beam.
2 grade of douglas fir are indicated below.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Understanding loads on beams.
The sign convention used for loading is positive values shown.
