Roof Purlin Wood Purlin Size And Spacing

15 3 12 in.

Roof purlin wood purlin size and spacing.

7 25 12 in. Roof steel dead load 63 psf steel american building components catalogue. 3 009 19 1 0019 1 5 12 in. For 2x4s purlins the posts are spaced in 4 feet distance.

The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. 3 1 43 lbs ft. Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. The heavier the expected load is the shorter the distance between the purlins. Twist is measured with the zee laying on a flat surface under its own weight. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

Net variation for combned dimension. Usually 400 450 or 600mm but any value can be used up to 610mm max. Ft 15 23 75 12 in. However engineering determines the optimal spacing between the purlins.

If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Roof lumber dead load 62 4 pcf 43 lbs ft.