Required Purlin Spacing For Corrugated Roofing

In heavy snow areas 500 series or greater panels are recommended and closer spacing of purlins should be considered.

Required purlin spacing for corrugated roofing.

Anything above that will require you to put out higher cost because they are already considered as higher pitch. Purlin spacing should suit the end laps required for the size of sheet to be used. Do all roofing projects require purlins. Maximum purlin spacing ro.

However sometimes corrugated sheets are 39 wide instead of 37 wide. The diagram above is a typical 37 wide panel and the spacing works out perfectly. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.

The screws are spaced out so that every third corrugation has a screw. For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. It often depends on the wideness thickness and the types of roofing materials the climate it has to withstand and many other factors. The overlaps ends and sides depends upon the sloop of the roof see below.

Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports. Span tables are to be read in conjunction with colorbeam design notes technical specifications and working with colorbeam. The following date is based upon uniform loading of corrugated panels fastened as recommended and with a safety factor of 2 5. 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.

We do recommend it however. Maximum rafter spacing or purlin span p. The standard of lower pitch actually ranges between 1 12 to 5 12. Span tables allow for a maximum 600mm overhang.

There will be four screws per screw line placed in the high of the corrugated panel. For the greca profile 900mm first and last and 1200mm for the intermediates. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Minimum pitch for corrugated metal roof.