Size Of Purlins For Metal Roof

They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

Size of purlins for metal roof.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. If so you should use dimension lumber like 2x4. Now if you are strapping the rafters 1x4 pt is usually used set at 2 intervals or closer and you double the first one at the edge of the metal. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

15 3 12 in. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Purlins are 2 by 4 feet and are installed much like metal roofing. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

7 25 12 in. You don t have a nailing surface on the end of a 1x4. 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.

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. Metal mart offers a complete line of engineered purlin material. Purlins are 2 by 4 feet and are installed much like metal roofing.

3 1 43 lbs ft. Cee purlin lengths are cut to length from 6 45 in 1 8 increments though 20 and 25 are the most commonly chosen lengths. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. 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. Purlins are installed horizontally under metal roofs. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. Net variation for combned dimension.

3 009 19 1 0019 1 5 12 in. Purlin spacing 23 75 in. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Roof steel dead load 63 psf steel american building components catalogue.