Roof Purlin Wood Purlin Size And Spacing

For 2x4s purlins the posts are spaced in 4 feet distance.

Roof purlin wood purlin size and spacing.

Net variation for combned dimension. Twist is measured with the zee laying on a flat surface under its own weight. Roof steel dead load 63 psf steel american building components catalogue. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.

3 009 19 1 0019 1 5 12 in. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Ft 15 23 75 12 in.

Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. Purlin spacing 23 75 in. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

Roof lumber dead load 62 4 pcf 43 lbs ft. However engineering determines the optimal spacing between the purlins. 3 1 43 lbs ft. 15 3 12 in.

The heavier the expected load is the shorter the distance between the purlins. Usually 400 450 or 600mm but any value can be used up to 610mm max.