There are several beam span tables for all the species of wood.
Post and beam roof span tables.
For lesser grades spans should be shorter.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
It also shows the maximum that the beam can span.
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.
Let s consider a basic gable wood roof framing design.
View joist rafter tables.
Sample floor beam span table.
The tables below give maximum spans for rafters and beams.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Beams of more than one ply must be fastened together with either nails or bolts.
On longer spans the beam may require much more bearing space as indicated by this table.
Numbers in blue are joist spans beam to beam or house to beam.
A 2 2x10 can span 10 feet and so on.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Here we have a wood framed gable roof.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
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Anything 5 and above we always at least double cripple.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
A double 2x12 beam can span 12 feet.
In other words the maximum distance it can cover without support from posts.
This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
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.
Dimensional lumber deck beam span chart.
The numbers in gray indicate the distance between the support posts.
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.
The full table shows more lumber sizes.
Continuing on from part 3.
The figures are based on quality materials.
