Steel Purlin Purlin Spacing For Corrugated Roofing

Minimum purlin size will vary according to span.

Steel purlin purlin spacing for corrugated roofing.

Minimum recommended purlin size is 4 x 2 50mm x 100mm in timber or z140mm x 1 6mm in steel. If the space between posts is greater than 8 feet then brace is needed to avoid buckling. Corrugated sheet roofing material is widely available and easy to use. All purlin joints must be supported by a rafter.

Purlin spacing 23 75 in. In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide. 15 3 12 in. Psf in purlin weight based on 43 g nds.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. 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. C3 fix side laps and miss 2 hit 1 miss 3 hit 1 miss 2 etc with approved fasteners alone. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.

For 2x4s purlins the posts are spaced in 4 feet distance. Purlins provide horizontal support for the sheets and form part of the framework for the building. 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. 3 1 43 lbs ft.

The overlaps ends and sides depends upon the sloop of the roof see below. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. 7 25 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.

End purlins and periphery of roof to be fixed every 2nd crest. 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. The screws are spaced out so that every third corrugation has a screw. 3 009 19 1 0019 1 5 12 in.

See section on purlin girt spacing. We do recommend it however. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. Z purlins are connected to the rafters using cleats.

The diagram above is a typical 37 wide panel and the spacing works out perfectly. However sometimes corrugated sheets are 39 wide instead of 37 wide. End purlins and periphery of roof to be fixed every 2nd crest. Do all roofing projects require purlins.

Note compliance with e2 as1 is dependent on purlin spacing and gauge of roofing. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 15 23 75 12 in.