Steel Purlin Purlin Spacing For Corrugated Roofing

If the space between posts is greater than 8 feet then brace is needed to avoid buckling.

Steel purlin purlin spacing for corrugated roofing.

We do recommend it however. Minimum purlin size will vary according to span. Corrugated sheet roofing material is widely available and easy to use. The overlaps ends and sides depends upon the sloop of the roof see below.

All purlin joints must be supported by a rafter. End purlins and periphery of roof to be fixed every 2nd crest. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. However sometimes corrugated sheets are 39 wide instead of 37 wide.

See section on purlin girt spacing. Purlin spacing 23 75 in. Purlins provide horizontal support for the sheets and form part of the framework for the building. Psf in purlin weight based on 43 g nds.

Note compliance with e2 as1 is dependent on purlin spacing and gauge of roofing. The screws are spaced out so that every third corrugation has a screw. Z purlins are connected to the rafters using cleats. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

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 2x6s purlins the posts are spaced in 6 feet distance. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Roof steel dead load 63 psf steel american building components catalogue roof lumber dead load 62 4 pcf 43 lbs ft.

3 1 43 lbs ft. There will be four screws per screw line placed in the high of the corrugated panel. When positioned roof purlins should be spaced no further than 1 2 metres apart when using sheeting with a thickness of 0 7mm and 1 metre when using 0 5mm sheeting. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

End purlins and periphery of roof to be fixed every 2nd crest. For 2x4s purlins the posts are spaced in 4 feet distance. 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.

15 3 12 in. 3 009 19 1 0019 1 5 12 in. The diagram above is a typical 37 wide panel and the spacing works out perfectly. In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide.

The typical roof structure now consists of steel i beam rafters placed approximately 10 feet this varies depending on purlin size and other variables apart with either 4 6 or 8 lightweight steel purlins installed horizontally across the rafters. Minimum recommended purlin size is 4 x 2 50mm x 100mm in timber or z140mm x 1 6mm in steel. 15 23 75 12 in.