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. 15 3 12 in. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. Purlins are 2 by 4 feet and are installed much like metal roofing.

Step 1 run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation. Net variation for combned dimension. Purlins are installed horizontally under metal roofs. Roof steel dead load 63 psf steel american building components catalogue.

Metal mart offers a complete line of engineered purlin material. Purlin spacing 23 75 in. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. 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 2x4s purlins the posts are spaced in 4 feet distance. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Purlins are 2 by 4 feet and are installed much like metal roofing. 3 009 19 1 0019 1 5 12 in.

You don t have a nailing surface on the end of a 1x4. 3 1 43 lbs ft. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Roof lumber dead load 62 4 pcf 43 lbs ft.

Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. 7 25 12 in. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. Twist is measured with the zee laying on a flat surface under its own weight. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. If so you should use dimension lumber like 2x4.