Steel Purlin Purlin Spacing For Corrugated Roofing

Z purlins are connected to the rafters using cleats.

Steel purlin purlin spacing for corrugated roofing.

Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. All purlin joints must be supported by a rafter. End purlins and periphery of roof to be fixed every 2nd crest. C3 fix side laps and miss 2 hit 1 miss 3 hit 1 miss 2 etc with approved fasteners alone.

See section on purlin girt spacing. 15 3 12 in. The screws are spaced out so that every third corrugation has a screw. 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.

For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. 7 25 12 in. In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide. However sometimes corrugated sheets are 39 wide instead of 37 wide.

End purlins and periphery of roof to be fixed every 2nd crest. Minimum purlin size will vary according to span. 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.

3 1 43 lbs ft. The overlaps ends and sides depends upon the sloop of the roof see below. Corrugated sheet roofing material is widely available and easy to use. Do all roofing projects require purlins.

The diagram above is a typical 37 wide panel and the spacing works out perfectly. For 2x4s purlins the posts are spaced in 4 feet distance. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. We do recommend it however.

Psf in purlin weight based on 43 g nds. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Note compliance with e2 as1 is dependent on purlin spacing and gauge of roofing.

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. Purlins provide horizontal support for the sheets and form part of the framework for the building. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.

There will be four screws per screw line placed in the high of the corrugated panel. 3 009 19 1 0019 1 5 12 in. Roof steel dead load 63 psf steel american building components catalogue roof lumber dead load 62 4 pcf 43 lbs ft.