A in my view purlins are the best choice for a shake roof.
Installation shake roof on purlins.
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.
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Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins.
Plywood is used more often these days because it is faster to install.
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.
During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins.
How to install purlins.
Install the second row of purlins just like the first cutting the end piece to fit.
Move two feet down the roof and snap a horizontal chalk line.
Plywood roof sheathing on a sloped roof particularly on low slope roofs can provide some diaphragm action if the roof framing is rigidly attached to the wall plates.
You will also need to install purlins around penetrations such as plumbing pipes electrical pipes and skylights among others.
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In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide.
Cedar shingle application cedar shake application.
Shake shingle roof application instructions feb 10 2017.