is osb board water resistant
OSB is said to be more water resistant than plywood by some and not so by others. But with the improvements being made in the manufacturing process it is more thought that the waterproofing of the OSB stands on its own. And that it cannot hurt to add more to the product. What You'll Need.hen buying your OSB look on the back to make sure it is stamped water proofed. Although this only is about water resistant it is better than no water proofing at all. Now you are going to apply water proofing to the rest of it.