Post And Beam Roof Span Tables

The numbers in gray indicate the distance between the support posts.

Post and beam roof span tables.

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. This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12. It also shows the maximum that the beam can span.

The determining factor of post spacing is the allowable span of your beams. Continuing on from part 3. Beams of more than one ply must be fastened together with either nails or bolts. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Dimensional lumber deck beam span chart. Numbers in blue are joist spans beam to beam or house to beam. Pergola beam span calculator bestpergoladesign post 7970212113 pergola main beams span building construction diy chatroom pergola main beams span building construction diy chatroom measuring pergola dimensions learn the standard patio roof maximum beam rafter spans beams sukkah and sukkot at baldwin outdoor comfort the specialists patio roof. Anything 5 and above we always at least double cripple.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. View joist rafter tables. 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. For lesser grades spans should be shorter.

A 2 2x10 can span 10 feet and so on. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. There are several beam span tables for all the species of wood. Patio roof maximum beam rafter spans.

Sample floor beam span table. The tables below give maximum spans for rafters and beams. The full table shows more lumber sizes. 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. The figures are based on quality materials. In other words the maximum distance it can cover without support from posts. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

This table is simply a sample and may not be valid for your region. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Here we have a wood framed gable roof.