Can OSB board be waterproofed? OSB is highly resistant to moisture and can be water and weatherproofed for exterior use using good quality paint or stain. It has superior strength to other wood panels and a slower rate of moisture absorption. Properly maintained and protected, OSB will last for decades.
Do you need to waterproof OSB? Do you need to waterproof OSB? To answer the question “Is oriented strand board waterproof?” the answer is: not completely. That’s because it’s virtually impossible to prevent some water absorption in a wood-based product, and moisture can be absorbed through cuts in the panel and the wood strands can swell.
Will painting OSB make it waterproof? You can paint OSB if you want to add to the water-resistant. If you decide to paint it then it must be done before waterproofing so that the paint is also protected from moisture or water. You can use either oil-based or latex-based paints. Then you should apply waterproofing.
How do you seal OSB board? To apply, soak the tip of the paintbrush in the sealer and brush it over the OSB board’s ends and surface. Ensure this process is repeated on both sides, and not just the areas where you made cuts. Coat your OSB pieces and allow the seal to dry for 12 to 14 hours. Now turn the wood and coat the remaining surfaces.