Both oriented strand board and exterior-grade plywood are widely accepted by building codes for roof decking, but each offers distinct advantages depending on climate and budget. Plywood is generally preferred in areas prone to heavy rain or high humidity because it dries out faster after getting wet and maintains structural integrity longer under moisture stress. Conversely, OSB provides a uniform, cost-effective surface with great shear strength, making it a popular choice for dry climates. However, if water gets trapped beneath roofing felt, OSB tends to swell along the edges more severely than plywood, making plywood the more durable choice for long-term roof performance.
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