Flat grain wood is obtained when trees are cut perpendicular to their growth lines. This technique is commonly used to produce veneers. Flat grain lumber has two sides: the bark side and the pith side. The bark side is the exterior portion of the lumber, while the pith side is the section closer to the center of the tree. Unlike vertical grain lumber, flat grain wood is not as sturdy or stable. It is susceptible to swelling and changes in shape over time. To minimize the changes in flat grain lumber, it is recommended to expose the bark side since it experiences less grain separation compared to the pith side. The use of a saw-texture on the surface of the wood can also help reduce the effects of aging. Although flat grain lumber is readily available and less expensive than straight grain wood, its vulnerability to weathering and damage makes it less suitable for certain projects.