Bamboo lumber, also called bamboo timber, bamboo planks, bamboo beams, bamboo dimensional lumber, is made by laminating bamboo strips together to form a log. It is a S4S timber. Available in both interior and exterior grade. It can be used for window frames, door frames, bamboo structural beams. Or used as bamboo columns for construction and buildings. It is always risky using bamboo for exterior. Clients are suggested to order small quantity, do some destructive tests and try the product on job site for a year and see how it works.