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New Brunswick, Canada | Do you mean hipped gambrel roof (hip)? Ours and everyone around here had theirs changed to metal in the 1950's around here. Neighbours just had theirs replaced instead of renailing it as they use the inside for a campground rec centre.
I did my shop and lean-too (7/12 pitch, on 2x6 ) in metal too about 7 years ago with the more modern cut to length sheets, and my mother roof just got done last summer.
Of the options: My shop has no sheathing, it was terrible working up high on purlins on edge and the long sheets (30+ feet) even in heavy gauge tended to kink. Needed heavy to span the purlins.
The lean-to was put on purlins on flat spaced much closer, on a 3/12 pitch, and was super simple.
My mom's roof was stripped to plywood to replace some damaged sheets before underlay, strapped and steel. Super easy to walk on during the work.
Our barn had the wood shingles stripped on the roof with steel overtop of the 1x4/1x6 strapping. Its super steep until you get to the top pitch, hard to work on with modern safety rules, we have had some quotes to do work on it but nobody wants to touch it.
Even 2/12 is dangerous to walk on wet, 7/12 you can't safely walk on even with clean dry conditions in clean sneakers, you just slide.
The best attachment method so far is the shortest possible screw installed in the flat. Almost every leak I've ever had has been in a rib. Every leak in a valley has been just too long screws + wood drying out pushing the screw out like in drywall work.
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anyone done a gambrel style barn roof in metal
