2 X8 Roof Purlin Span Table

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

2 x8 roof purlin span table.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. The loads are based on adjusted roof snow.

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. 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. My question is can i use 2 x 4 on edge spaced. 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.

Can 2 4 roof purlins span 12 feet. View joist rafter tables. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Use these two tables for.

These tables can also be used to determine deck joist span. Table 9 2 adjustment factors for alternate loading and spacing conditions for determining required com. Also available for the android os. 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.

For 2x4s purlins the posts are spaced in 4 feet distance. 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. A yield point of 57 ksi fy was used in determining the values in these tables. That is exactly what i have double trusses on each side of a post on 12 centers.

Notes symbols ae in 2 effective area of the section for axial loading area in 2 full unreduced cross section area of the section. Reader dave in michigan writes. 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. For special conditions not covered in the tables or for selecting sections for a specifi c application contact your supplier.