Floyd County, Iowa | redfarm - 12/30/2017 07:43
I have a lean-to on a Morton that was built with the shed. They sheet the roof with OSB under the steel to strengthen it, lots of snow moves off the base building and piles on the lean-to until it falls off. It's plenty strong.
Actually, the OSB only "strengthens" the steel sheathing itself by preventing any sagging that might happen from a great deal of weight on the steel between the roof purlins, which would only be 24" on centers.
BUT, the OSB will LOWER the snow or top chord live load, unless the rafters (either half trusses or single chord rafters) were built for the additional dead load of the OSB.
In my opinion, in the case of his lean-to, a person would be better off investing the cost of the OSB into stronger rafter system, to support the snow load that will, at some time, accumulate on the roof.
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Lean to roof pitch
