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.

Purlins are 2 by 4 feet and are installed much like metal roofing. 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. The topic we want to discuss today is the purlin installation. The guide contains details on all stramit purlins girts bridging and relevant accessories.

These span across the empty space and a. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Onto the current decking and then installing the new. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. Install the roofing screws vertically along each rib in the panel.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Metal roof purlins are installed horizontally under metal roofs. I will be removing the old roof and installing the new one along with a radiant barrier under that. 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.

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

1 introduction this detailing and installation guide is complementary to the stramit purlins girts bridging product technical manual incorporating design capacity tables. I am getting two different stories from contractors regarding purlins v s. How to install purlins.