Roof Beam Span Table

Window door garage door headers supporting roof wall floor loads.

Roof beam span table.

Beams of more than one ply must be fastened together with either nails or bolts. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

On longer spans the beam may require much more bearing space as indicated by this table. This span table excerpt shows two possible sizes. Patio roof maximum beam rafter spans. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.

F stands for the beam s fiber strength in bending which depends on the species of wood. This post may contain affiliate links. Required size for a given span. Anything 5 and above we always at least double cripple.

In the example the beam spans the 10 foot width of the roof. 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. For the initial calculation f can be estimated at 1 000.

This table is simply a sample and may not be valid for your region. For more information see our disclosures here. Continuing on from part 3. 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.

The total load is 4 000 pounds. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. Sample floor beam span table. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.

Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Window door garage door headers supporting roof loads only. There are several beam span tables for all the species of wood. Fill in the parts of the formula that are already known.

Let s consider a basic gable wood roof framing design.