Purlin Size For Metal Roofing

Available in red oxide or galvanized cee purlins are cut to the nearest 1 8.

Purlin size for metal roofing. Cee purlins are secondary steel framing members used for roof and wall support as well as a header sill brace and more. For 2x4s purlins the posts are spaced in 4 feet distance. Twist is measured with the zee laying on a flat surface under its own weight. 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 heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. Metal roofing gauge sizes. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. We do recommend it however.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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 the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

In many cases post frames lack structural sheathing so the roof panels will need to span between the supporting purlins or trusses. Do all roofing projects require purlins.