Purlins For Steel Roof

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

Purlins for steel roof.

Welded together they can be used as columns braces and ties. 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. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. For 2x4s purlins the posts are spaced in 4 feet distance. 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.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. The purpose of purlins. Purpose use cee purlins are secondary steel framing members most commonly used as roof purlins wall girts and header jamb and sill for windows and doors on metal buildings. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.

These structural supports run perpendicular across the rafter beams. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Purlins are installed horizontally under metal roofs. Do all roofing projects require purlins.

We do recommend it however. 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. Purlins are an important component in a pre engineered steel structural kit. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building.