Install Roof Purlins

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.

Install roof purlins. I will be removing the old roof and installing the new one along with a radiant barrier under that. I am getting two different stories from contractors regarding purlins v s. 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.

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. 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. These span across the empty space and a. 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. Purlins are 2 by 4 feet and are installed much like metal roofing. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed.

In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. 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. Install the roofing screws vertically along each rib in the panel. How to install purlins.

Onto the current decking and then installing the new. 1 introduction this detailing and installation guide is complementary to the stramit purlins girts bridging product technical manual incorporating design capacity tables. During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. The guide contains details on all stramit purlins girts bridging and relevant accessories.

Purlins are dimensional lumber that are fastened to the top chord of trusses connecting them together for bracing purposes. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Now all the a frames are in its time for the purlins.