What is a rough opening in construction?

In construction, a rough opening refers to the framed opening in a wall where a window or door will be installed. This space is slightly larger than the actual size of the window or door unit to allow for proper installation and adjustments. It provides room for shimming to ensure the door or window is plumb, level, and square. Additionally, the rough opening accommodates any necessary components such as framing, flashing, and insulation that may need to be added during the installation process.

Understanding the definition of a rough opening is crucial for contractors and builders, as it impacts the entire process of framing and finishing an opening for a window or door, ensuring the final installation is secure and functional.