OSB stands for oriented strand board and is an engineered wood used mainly in construction. OSB is made of large wood chips that are oriented in different directions, mixed with adhesives, and pressed to a board in a heat press. The standard size of OSB boards is 4 x 8 ft (1220 x 2440 mm ).
OSB has a bad reputation, it is said to be of poor quality and to smolder up with the faintest touch of water. But the OSB technology is always improving and maturing, new boards of better quality and with more specialized uses reach the market every year.