Size Of Purlins For Metal Roof

Roof lumber dead load 62 4 pcf 43 lbs ft.

Size of purlins for metal roof.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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.

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. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf.

Net variation for combned dimension. 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 standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. Cee purlin lengths are cut to length from 6 45 in 1 8 increments though 20 and 25 are the most commonly chosen lengths.

Purlins are installed horizontally under metal roofs. Ft 15 23 75 12 in. Purlins are 2 by 4 feet and are installed much like metal roofing. Twist is measured with the zee laying on a flat surface under its own weight.

Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. 7 25 12 in. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. 15 3 12 in.

Purlins are 2 by 4 feet and are installed much like metal roofing. Purlin spacing 23 75 in. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. 3 009 19 1 0019 1 5 12 in.

If so you should use dimension lumber like 2x4. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. 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. 3 1 43 lbs ft.