Roof Purlin Wood Purlin Size And Spacing

Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf.

Roof purlin wood purlin size and spacing.

Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. However engineering determines the optimal spacing between the purlins. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Ft 15 23 75 12 in. For 2x4s purlins the posts are spaced in 4 feet distance. Usually 400 450 or 600mm but any value can be used up to 610mm max.

Net variation for combned dimension. 7 25 12 in. 15 3 12 in. Roof steel dead load 63 psf steel american building components catalogue.

Roof lumber dead load 62 4 pcf 43 lbs ft. 3 1 43 lbs ft. Purlin spacing 23 75 in. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.

Twist is measured with the zee laying on a flat surface under its own weight. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.