Reply by msinc

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Posted on Metal roofing

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567 posts in 1177 days

#1 posted 04-20-2018 01:46 AM

I have seen it done where they leave the shingles, but I would never do it that way. Why leave all that extra weight on the roof and trusses? The boards you put down that run across are called “purlings” and you don’t necessarily need them IF the roof has sheathing {plywood}. I built a hunting cabin a few years back and I used purlings. I used 2X4’s across the roof trusses and it worked perfect. If you use boards that are less than 2X4’s you probably wont be able to walk on it and you need to to screw the metal down. If the roof has sheathing and you still want to use purlings you can pretty much use just about anything, e.g., 1X4’s would work fine because you can walk on the sheathing.
Every time I have seen metal put down right over the sheathing they always applied a layer of either felt or most of the time this synthetic rubber covering. You don’t need any of that with purlings. It goes without saying that a standing seam metal roof is the better design, but anything metal is way better than shingles.

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