Roof Beam Span Table

Here we have a wood framed gable roof.

Roof beam span table. On longer spans the beam may require much more bearing space as indicated by this table. In the example the beam spans the 10 foot width of the roof. 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. Patio roof maximum beam rafter spans.

According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. This post may contain affiliate links. L stands for the span of the beam in feet. The total load is 4 000 pounds.

Required size for a given span. 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. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. 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. Continuing on from part 3. Designing with roof rafter span tables lvl 2 0e 2900fb power beam anthony forest s co raising ceiling joists jlc roofdek manual structural roof decking and trays. This span table excerpt shows two possible sizes.

Let s consider a basic gable wood roof framing design. 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. This table is simply a sample and may not be valid for your region. For more information see our disclosures here.

Spacing should be interpreted as the centre to centre distance between adjacent parallel members. F stands for the beam s fiber strength in bending which depends on the species of wood. Sample floor beam span table. Window door garage door headers supporting roof wall floor loads.

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. Fill in the parts of the formula that are already known. Anything 5 and above we always at least double cripple. 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.