How are doors usually attached to wood framing?

Doors are typically attached to wood framing using a combination of 16D nails (also known as framing nails) and shims. This method provides a sturdy and secure installation. The 16D nails help fasten the door frame tightly to the wall structure, ensuring that the door operates smoothly without sagging. Shims are thin pieces of material used to adjust the position of the door frame, allowing for proper alignment and a level installation. This combination of nails and shims is crucial for ensuring that the door opens and closes properly while maintaining aesthetic appearance and functionality.

Other methods, such as using screws alone, would not provide the same kind of stability and support for the door framing, while using brackets only or glue lacks the effectiveness and strength needed for a durable installation. Glue does not provide the structural integrity required to withstand daily use as doors are regularly opened and closed. Therefore, the most effective and traditional method is the use of 16D nails along with shims.