What is Flat Grain?

Flat grain, also known as plain sawn or flat sawn, is a type of lumber cut from a log at a perpendicular angle to the growth rings, resulting in a grain pattern that is generally straight and consistent. It is the most common method of cutting lumber and is used to produce a wide range of wood products, including furniture, cabinetry, and flooring.

When a log is flat sawn, the saw blade first cuts through the top of the log, creating a series of parallel slices that are oriented in a straight line. As the blade moves downward, it cuts through the log at an angle, producing a distinctive grain pattern that is often characterized by a series of overlapping arches or cathedrals.

Flat grain lumber is generally less expensive than other types of lumber, since it can be cut more quickly and with less waste. It is also relatively stable, meaning that it is less likely to warp or twist than other types of lumber.

However, flat grain lumber is typically less strong and less durable than other types of lumber, since the grain pattern can be interrupted by knots or irregularities in the log. It is also more susceptible to moisture damage and decay if not properly treated and protected.