Quick Answer: BWR means boiling water resistant and BWP means boiling waterproof. BWP plywood is built to take much more water than BWR, so it suits wet zones like the sink base. BWR plywood is a good, common choice for most kitchen cabinet boxes. In a very damp home, such as a hill house, many designers use BWP or HDHMR near the sink and BWR elsewhere. Key Facts: BWR stands for boiling water resistant. BWP stands for boiling waterproof. Plywood is made of thin wood layers gl