How To Install Metal Roof Purlins

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

How to install metal roof purlins.

I am installing ribbed metal panels over a singlt slope roof on a new workshop. Then cover the entire roof with a layer of insulation and secure it with a staple gun. During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

The topic we want to discuss today is the purlin installation. Purlins are 2 by 4 feet and are installed much like metal roofing. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. Metal roof purlins are installed horizontally under metal roofs.

The structure of purlin helps to shift some of the loads that put on the metal sheeting to the main building construction by ensuring that the whole things stay in their place and adding structural integrity. The advice within this installation guide is of a limited nature and should only be used as a guide its not be relied upon as an exact instruction on how a roof should be safely installed which will vary with circumstances. 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. Before you install metal roofing repair any damage to the wood under the shingles.

This installation guide provides general advice on how to install a single skin sheeted metal roof. The roofing is manufactured in panels that. Next use 1 inch nails to secure some metal edging to the perimeter of the roof. I was planning to install directly over 2x4 purlins which are mostly already installed.

They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Installing wood stripping under a tin roof.