Steel Purlin Purlin Spacing For Corrugated Roofing

The diagram above is a typical 37 wide panel and the spacing works out perfectly.

Steel purlin purlin spacing for corrugated roofing. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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. C3 fix side laps and miss 2 hit 1 miss 3 hit 1 miss 2 etc with approved fasteners alone. 7 25 12 in.

For 2x4s purlins the posts are spaced in 4 feet distance. 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 overlaps ends and sides depends upon the sloop of the roof see below.

If the space between posts is greater than 8 feet then brace is needed to avoid buckling. 3 1 43 lbs ft. 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 screws are spaced out so that every third corrugation has a screw.

15 23 75 12 in. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. End purlins and periphery of roof to be fixed every 2nd crest.

Do all roofing projects require purlins. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Psf in purlin weight based on 43 g nds. See section on purlin girt spacing.

All purlin joints must be supported by a rafter. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. There will be four screws per screw line placed in the high of the corrugated panel. Note compliance with e2 as1 is dependent on purlin spacing and gauge of roofing.

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. Purlin spacing 23 75 in. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

Roof steel dead load 63 psf steel american building components catalogue roof lumber dead load 62 4 pcf 43 lbs ft. Purlins provide horizontal support for the sheets and form part of the framework for the building. 15 3 12 in. For 2x6s purlins the posts are spaced in 6 feet distance.

Corrugated sheet roofing material is widely available and easy to use. Z purlins are connected to the rafters using cleats. We do recommend it however.