Roof Purlin Wood Purlin Size And Spacing

15 3 12 in.

Roof purlin wood purlin size and spacing.

Ft 15 23 75 12 in. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. However engineering determines the optimal spacing between the purlins. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

Net variation for combned dimension. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. 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 steel dead load 63 psf steel american building components catalogue. The heavier the expected load is the shorter the distance between the purlins. Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

3 009 19 1 0019 1 5 12 in. 3 1 43 lbs ft. This is the distance between rafter centres. 7 25 12 in.

Twist is measured with the zee laying on a flat surface under its own weight. Roof lumber dead load 62 4 pcf 43 lbs ft.