Size Of Purlins For Metal Roof

Roof steel dead load 63 psf steel american building components catalogue.

Size of purlins for metal roof. Purlins are 2 by 4 feet and are installed much like metal roofing. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. 3 009 19 1 0019 1 5 12 in.

Purlins are installed horizontally under metal roofs. 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. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

3 1 43 lbs ft. For 2x4s purlins the posts are spaced in 4 feet distance. Cee purlin lengths are cut to length from 6 45 in 1 8 increments though 20 and 25 are the most commonly chosen lengths. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Purlin spacing 23 75 in. You don t have a nailing surface on the end of a 1x4. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

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. 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. 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. Purlins are 2 by 4 feet and are installed much like metal roofing.

Roof lumber dead load 62 4 pcf 43 lbs ft. Net variation for combned dimension. 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. If so you should use dimension lumber like 2x4.

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. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. 7 25 12 in.