Required Purlin Spacing For Corrugated Roofing

Purlin spacing should suit the end laps required for the size of sheet to be used.

Required purlin spacing for corrugated roofing.

For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Do all roofing projects require purlins. Anything above that will require you to put out higher cost because they are already considered as higher pitch. It often depends on the wideness thickness and the types of roofing materials the climate it has to withstand and many other factors.

We do recommend it however. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. For the greca profile 900mm first and last and 1200mm for the intermediates. Maximum purlin spacing ro.

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. The overlaps ends and sides depends upon the sloop of the roof see below. Suntuf is supported on the structure via purlins these are the bearers that run left to right along the width of the roof the maximum purlin spacing for the corrugated profile is 800mm centres on the first and last purlins and 1 meter centres for the intermediate purlins. Minimum pitch for corrugated metal roof.

There will be four screws per screw line placed in the high of the corrugated panel. Span tables allow for a maximum 600mm overhang. All dimensions on tables are in millimetres. Span tables are to be read in conjunction with colorbeam design notes technical specifications and working with colorbeam.

Maximum rafter spacing or purlin span p. However sometimes corrugated sheets are 39 wide instead of 37 wide. The screws are spaced out so that every third corrugation has a screw. Corrugated sheet roofing material is widely available and easy to use.

The standard of lower pitch actually ranges between 1 12 to 5 12. Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. In heavy snow areas 500 series or greater panels are recommended and closer spacing of purlins should be considered. The diagram above is a typical 37 wide panel and the spacing works out perfectly.