Install Roof Purlins

In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide.

Install roof purlins.

Install the roofing screws vertically along each rib in the panel. Metal roof purlins are installed horizontally under metal roofs. The guide contains details on all stramit purlins girts bridging and relevant accessories. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

Purlins are 2 by 4 feet and are installed much like metal roofing. During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. I have the option of installing the new roof directly to the existing deck or installing new decking if need be or installing 1x4 purlins 2 ft. When using plywood nail it directly to the purlins and screw the metal roofing panels through the plywood into the purlins as instructed by the manufacturer.

How to install purlins. I am getting two different stories from contractors regarding purlins v s. 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. Now all the a frames are in its time for the purlins.

These span across the empty space and a. Purlins are dimensional lumber that are fastened to the top chord of trusses connecting them together for bracing purposes. 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. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

The topic we want to discuss today is the purlin installation. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line.

1 introduction this detailing and installation guide is complementary to the stramit purlins girts bridging product technical manual incorporating design capacity tables. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. 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.