Slower absorption of moisture is ideal for throwing a tarp out over an unprotected subfloor or catching a leak before real damage. OSB absorbs less moisture, but plywood dries out faster and more completely. How the subfloor materials react to water matters during both an open-air construction phase of a house as well as homeownership when a leak or flood might compromise the subfloor. ![]() Meanwhile, OSB compacts as many as 50 layers of strands into a single sheet the same thickness as that plywood, ensuring a much denser-and heavier-product throughout. OSB is considered more structurally consistent than plywood. Since a sheet of plywood consists of several large veneers of wood, it’s susceptible to instances of knots and other imperfections (which, if aligned, could create slightly softer spots throughout the material).OSB? Well, each has their own strengths and weaknesses when used as exposed decking or subflooring.
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