Numbers in blue are joist spans beam to beam or house to beam.
Post and beam roof span tables.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
It also shows the maximum that the beam can span.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
The full table shows more lumber sizes.
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The tables below give maximum spans for rafters and beams.
Dimensional lumber deck beam span chart.
The determining factor of post spacing is the allowable span of your beams.
A 2 2x10 can span 10 feet and so on.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
The figures are based on quality materials.
This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12.
The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value.
A double 2x12 beam can span 12 feet.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
Anything 5 and above we always at least double cripple.
Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches.
On longer spans the beam may require much more bearing space as indicated by this table.
View joist rafter tables.
The numbers in gray indicate the distance between the support posts.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
Let s consider a basic gable wood roof framing design.
There are several beam span tables for all the species of wood.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
Allowable spans vary according to wood species and the loads that the beam will bear such as snow loads or the dead loads of construction materials.
For lesser grades spans should be shorter.
In other words the maximum distance it can cover without support from posts.
Sample floor beam span table.
Here we have a wood framed gable roof.
This table is simply a sample and may not be valid for your region.
