Size Of Purlins For Metal Roof

Metal mart offers a complete line of engineered purlin material.

Size of purlins for metal roof.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Ft 15 23 75 12 in. For 2x4s purlins the posts are spaced in 4 feet distance. Roof steel dead load 63 psf steel american building components catalogue.

Twist is measured with the zee laying on a flat surface under its own weight. 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. 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. 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. 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. 15 3 12 in.

They give added support to the roof and also provide a nailing surface for the end panels and drip edge. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. Net variation for combned dimension. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

If so you should use dimension lumber like 2x4. 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. Purlin spacing 23 75 in.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Purlins are 2 by 4 feet and are installed much like metal roofing. Ft psf in purlin weight based on 43 g nds total purlin dead load 1 638 psf. 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. 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. 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.