Purlin Spacing For Corrugated Roofing

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

Purlin spacing for corrugated roofing.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. In some cases however the exact spacing of the rafters doesn t matter if the roof has other means of supporting the metal panels. Do all roofing projects require purlins. The screws are spaced out so that every third corrugation has a screw.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. The support system for the roof is comprised of ridgepole and rafters or purlins. Panel basics corrugated metal panels often called tin because in the past such panels were sometimes made of tin are typically steel or aluminum sheets that are used as a roofing material. In heavy snow areas 500 series or greater panels are recommended and closer spacing of purlins should be considered.

We do recommend it however. However sometimes corrugated sheets are 39 wide instead of 37 wide. Correctly measure the spacing of furring strips for a metal roof to further decrease condensation. 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. When framing the roof the spacing for roof trusses should not exceed 24 inches 61 cm and purlins should not exceed 36 inches 91 cm apart. Non accessible roof and intermediate 1 600 2 400 1 500 2 100 wall cladding type 3 end 1 100 1 600 1 000 1 400 maximum recommended purlin intermediate 0 900 1 500 0 800 1 200 spacing for standard roof end 0 600 1 000 0 550 0 800 see notes below. Purlins at 450mm spacing.

There will be four screws per screw line placed in the high of the corrugated panel. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Twenty four inches is a common spacing of furring strips for a metal roof.