OSB (oriented strand board) is a manufactured wood product that contains striated fibers of wood, held together using a strong resin glue. The edges that are cut during the milling process are coated with a waterproof paint to seal them from moisture. When working with OSB to build a sub-roof, sub-floor or side wall, any new edges created by cutting should ideally be sealed using the same, or similar process. Taking a little extra time to protect the integrity of the wood makes it a project that will last for years.
Things You'll Need
- Measuring tape
- Circular saw
- Exterior waterproof paint
Use a measuring tape to mark off the needed length and width of OSB. Cut the wood using a circular saw. Setting the large sheets of OSB on sawhorses will make the job of cutting them easier.
Mix a can of exterior waterproof paint using a stir stick. Use a small paintbrush to coat all newly cut edges.
Allow the paint two hours to dry. Add a second coat to any areas that are missed, or appear thin.
Give the wood an additional two hours of drying time. Install the OSB as normal.