2 X8 Roof Purlin Span Table

These tables can also be used to determine deck joist span.

2 x8 roof purlin span table.

For special conditions not covered in the tables or for selecting sections for a specifi c application contact your supplier. That is exactly what i have double trusses on each side of a post on 12 centers. For 2x4s purlins the posts are spaced in 4 feet distance. Reader dave in michigan writes.

The loads are based on adjusted roof snow. View joist rafter tables. 2 x 8 1 1 2 x 7 1 4 2 x 10 1 1 2 x 9 1 4 2 x 12 1 1 2 x 11 1 4 4. 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.

Also available for the android os. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. My question is can i use 2 x 4 on edge spaced. Rafter spans are tabulated for the most common roof loads.

Table 9 2 adjustment factors for alternate loading and spacing conditions for determining required com. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Use these two tables for. 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.

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. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Can 2 4 roof purlins span 12 feet.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Notes symbols ae in 2 effective area of the section for axial loading area in 2 full unreduced cross section area of the section. Span calculator for wood joists and rafters 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.