Answer. OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up.Click to see full answer. Herein, which side of OSB goes down?”This side down” applies to when it’s used as subflooring. That side should be facing down, against the joists. When used as wall sheathing, that side should be against the studs.Subsequently, question is, which side of plywood goes up? For most projects, these types of plywood will work because you can put the higher rated side facing out while the lower rated side is hidden facing in. Furthermore, can OSB be installed vertically? Using wood structural sheathing vertically on a wall is accepted practice in the building codes. Consult the APA Wall Construction Guide or our SR101B that shows using longer length OSB for both shear and uplift in high wind market designs.Will rain hurt OSB board?Normal delays and the rain you indicated will not affect the structural properties of the panels. Also, with that amount of rain, plywood and OSB may have some swelling at the edges and a thorough inspection of the panels should be done after the panels have completely dried.

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