I am installing OSB sheathing on a 20x30 workshop roof. I prefer OSB over plywood because it is less costly and has guide lines to help with attachment. In this install I am using 2" torx screws to lock the OSB to the trusses. After I install the OSB I use a plastic underlayment designed to prevent water from getting to the OSB or into the building if the metal roof were to fail. This is a task that can be done alone but it is much easier to work with two.

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