You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Wood beam span table.
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.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Window door garage door headers supporting roof loads only.
Engineered wood products ewp lvl span and size charts.
The table below shows an excerpt from a maximum span for built up douglas fir floor beams table for supporting not more than one floor.
Anything 5 and above we always at least double cripple.
View joist rafter tables.
Versa lam laminated veneer lumber lvl beams and headers eliminate twisting shrinking and splitting and deliver flatter quieter floors and structures.
Aitc capacity tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size span and material properties.
Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
On longer spans the beam may require much more bearing space as indicated by this table.
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.
Aitc beam capacity tables.
This span table excerpt shows two possible sizes.
Sample floor beam span table.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
However this seems to match the 6 joist span column of the table.
Span calculator for wood joists and rafters also available for the android os.
Our versa lam lvl is manufactured in either alexandria lena louisiana in eastern united states or in white city oregon for the western united states.
Michael t 5 17 2017 12 53 19 am reply.
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.
In the article it is stated that a 12 joist span corresponds to the double beam span a length equal to the 2x width.
Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.
These tables are provided as a guideline.
