2 X8 Roof Purlin Span Table

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

2 x8 roof purlin span table.

For 2x4s purlins the posts are spaced in 4 feet distance. Span calculator for wood joists and rafters also available for the android os. For special conditions not covered in the tables or for selecting sections for a specifi c application contact your supplier. Table 9 2 adjustment factors for alternate loading and spacing conditions for determining required com.

For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and 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. These tables can also be used to determine deck joist span. Also available for the android os. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. See a 1 3 for 2 span floor joist requirements. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.

Notes symbols ae in 2 effective area of the section for axial loading area in 2 full unreduced cross section area of the section. Use these two tables for. That is exactly what i have double trusses on each side of a post on 12 centers. My question is can i use 2 x 4 on edge spaced.

Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. Rafter spans are tabulated for the most common roof loads. View joist rafter tables. Reader dave in michigan writes.

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. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The loads are based on adjusted roof snow. Hi i saw on your webpage the pole barn guru stated the trusses could be spaced 12 apart i called and was told it is a double truss one on each side of a post that is on 12 centers.