Brazilian Teak (Cumaru) Hardwood Flooring. All of our solid prefinished hardwood flooring is kiln dried and NWFA certified or better for your peace of mind. Our solid flooring is 3/4" thick and coated with the industry leading UV cured Aluminum Oxide finish which provides superior scratch resistance and hardness with simple cleaning and maintenance. Commonly reffered to as its South American name, Cumaru, and possessing a janka hardness rating of 3540, Brazilian Teak is one of the hardest flooring species available.