I used to flip my triangle cuts on roofs (many years ago) to save on material (the going green movement) after the manufacturer said it was fine to do this. Well, having been down this road before, it's fine, and structurally it does not make a difference. ![]() ![]() They butt the OSB up tight on panel ends and use the good old sledge to hit the T&G together. Also, I have yet to see OSB be installed per instructions, that 1/8 inch gap on all edges, never seen it happen. Yup, like Jerry commented, I have talked to LP about this before, and other manufacturers of OSB for the same reason, and no one had an issue with the panels being upside-down. There might be an issue depending on what covering you install on top as you might have to fill the notches, wood floors or a thick pad with carpet, no worries there, install away. The water will still drain between the T&G ends, but then, it’s still not an issue, you just need to let the OSB dry out properly before installing coverings, not all OSB have this notch. The issue you might have is during construction (rain) as the notches on the panel ends that meet on the joist will not allow water to drain that enter between the panel ends, as they are face up. ![]() This product has a special draining feature to move water out of the tongue and groove channel it also has a smoother top surface to ease in flooring instalation.Well, having been down this road before, it's fine, and structurally it does not make a difference. As a few others have noted this product has specific features that require it to be installed as indicated by LP.
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