Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Post and beam roof span tables.
This table is simply a sample and may not be valid for your region.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Sample floor beam span table.
For lesser grades spans should be shorter.
A double 2x12 beam can span 12 feet.
Patio roof maximum beam rafter spans.
The figures are based on quality materials.
Dimensional lumber deck beam span chart.
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.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12.
In other words the maximum distance it can cover without support from posts.
Here we have a wood framed gable roof.
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.
Let s consider a basic gable wood roof framing design.
Beams of more than one ply must be fastened together with either nails or bolts.
There are several beam span tables for all the species of wood.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
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.
The tables below give maximum spans for rafters and beams.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
Anything 5 and above we always at least double cripple.
On longer spans the beam may require much more bearing space as indicated by this table.
Continuing on from part 3.
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The determining factor of post spacing is the allowable span of your beams.
A 2 2x10 can span 10 feet and so on.
Numbers in blue are joist spans beam to beam or house to beam.
It also shows the maximum that the beam can span.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
View joist rafter tables.
