Roof Framing On Span Of 50 Feet

Continuing on from part 3.

Roof framing on span of 50 feet.

In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 6 12 2 12 40 43 59 42 49 62 45 56 66 48 57 71 6 12 2 5 12 37 38 52 38 44 57 41 50 61 44 52 66 6 12 3 12 33 33 45 35 38 52 38 43 56 40 46 60 6 12 3 5 12 28 28 38 32 32 44 34 37 50 36 39 54. Spans in feet to out of bearing spans in feet to out of bearing. There are also factors such as deflection elasticity and wood species that come in to play.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Let s consider a basic gable wood roof framing design. Here we have a wood framed gable roof. Span calculator for wood joists and rafters also available for the android os.

For roof live loads of 12 psf or 16 psf. Typical roof truss design spans general notes. Use these two tables for. Every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project.

Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16. The figures are based on quality materials. Also available for the android os. Rafter and joist span faq.

The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. The lengths and sizes of joists vary depending on the species and quality of the lumber used. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. The tables below give maximum spans for rafters and beams.

For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. The loads are based on adjusted roof snow loads from the governing building code.