What type of door is characterized by its solid wood frame and flat surfaces on both sides?

The type of door characterized by its solid wood frame and flat surfaces on both sides is known as a flush door. This design features a smooth, flat surface that is uniform, making it suitable for a variety of applications in both residential and commercial settings. Flush doors are typically constructed with a solid core or hollow core, allowing for a sturdy structure while also being lightweight, particularly in the case of hollow core doors. The flat surface makes them aesthetically versatile, allowing for easy painting or finishing.

Panel doors, in contrast, consist of raised or recessed panels that provide architectural detail, which differentiates them distinctly from flush doors. Solid core doors have a solid interior for enhanced durability and sound insulation, while hollow core doors are designed with a core that is not solid, offering a lightweight option with some compromises on strength and insulation. Understanding these differences helps in selecting the appropriate door type based on the requirements of stability, insulation, and design aesthetic.