2 X8 Roof Purlin Span Table

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.

2 x8 roof purlin span table.

Can 2 4 roof purlins span 12 feet. My question is can i use 2 x 4 on edge spaced. These tables can also be used to determine deck joist span. A yield point of 57 ksi fy was used in determining the values in these tables.

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. For special conditions not covered in the tables or for selecting sections for a specifi c application contact your supplier. For 2x4s purlins the posts are spaced in 4 feet distance.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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. Use these two tables for. Rafter spans are tabulated for the most common roof loads.

See a 1 3 for 2 span floor joist requirements. Reader dave in michigan writes. Table 9 2 adjustment factors for alternate loading and spacing conditions for determining required com. Span calculator for wood joists and rafters also available for the android os.

That is exactly what i have double trusses on each side of a post on 12 centers. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. View joist rafter tables. The loads are based on adjusted roof snow.

Notes symbols ae in 2 effective area of the section for axial loading area in 2 full unreduced cross section area of the section. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Also available for the android os. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.