OSB panels installed correctly as roof decking or subflooring are entirely safe to walk on, as they undergo rigorous testing to meet strict structural load standards for deflection and weight capacity. However, safety depends heavily on proper installation, adequate joist spacing, and keeping the panels completely dry. If OSB gets soaked by heavy rain before the roof or flooring finish is applied, it can temporarily lose some stiffness or become slippery, posing safety hazards for construction workers. Once dry and properly secured to framing, it provides a stable, safe walking surface.
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