Roof Purlin Wood Purlin Size And Spacing

Ft 15 23 75 12 in.

Roof purlin wood purlin size and spacing.

For 2x4s purlins the posts are spaced in 4 feet distance. Twist is measured with the zee laying on a flat surface under its own weight. The heavier the expected load is the shorter the distance between the purlins. However engineering determines the optimal spacing between the purlins.

15 3 12 in. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. Roof steel dead load 63 psf steel american building components catalogue. 3 1 43 lbs ft.

Net variation for combned dimension. Usually 400 450 or 600mm but any value can be used up to 610mm max. 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.

7 25 12 in. 3 009 19 1 0019 1 5 12 in. Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.