Final answer:
The framer gets the nailing pattern for a staircase header from the architectural plans, which provide necessary specifications to ensure structural integrity and adherence to building codes.
Step-by-step explanation:
When framing a header for a staircase, the framer typically refers to the architectural plans to determine the nailing pattern. These plans provide detailed specifications regarding the construction, and include information such as dimensions, materials, and construction methods to be used. The nailing pattern is crucial to ensure the structural integrity of the staircase and must adhere to the local building codes and standards. Contractors must follow these plans exactly unless they have explicit permission to deviate for a specific, approved reason. Personal preference, online forums, or hardware store recommendations should not override the specifications set by the architect.