Steel Purlin Purlin Spacing For Corrugated Roofing

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

Steel purlin purlin spacing for corrugated roofing. 3 009 19 1 0019 1 5 12 in. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. All purlin joints must be supported by a rafter. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports.

The overlaps ends and sides depends upon the sloop of the roof see below. 3 1 43 lbs ft. End purlins and periphery of roof to be fixed every 2nd crest. Corrugated sheet roofing material is widely available and easy to use.

Roof steel dead load 63 psf steel american building components catalogue roof lumber dead load 62 4 pcf 43 lbs ft. See section on purlin girt spacing. However sometimes corrugated sheets are 39 wide instead of 37 wide. 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.

Minimum recommended purlin size is 4 x 2 50mm x 100mm in timber or z140mm x 1 6mm in steel. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Purlin spacing 23 75 in. 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. Psf in purlin weight based on 43 g nds. For 2x6s purlins the posts are spaced in 6 feet distance.

The diagram above is a typical 37 wide panel and the spacing works out perfectly. 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 heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. 15 3 12 in.

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. 15 23 75 12 in. End purlins and periphery of roof to be fixed every 2nd crest. There will be four screws per screw line placed in the high of the corrugated panel.

The screws are spaced out so that every third corrugation has a screw. If the space between posts is greater than 8 feet then brace is needed to avoid buckling. Note compliance with e2 as1 is dependent on purlin spacing and gauge of roofing. Z purlins are connected to the rafters using cleats.

We do recommend it however. In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide. Purlins provide horizontal support for the sheets and form part of the framework for the building.