Doors are where architecture gets personal. Every person who walks through a building interacts with doors dozens of times a day, and every one of those doors sits in a frame that was selected, specified, and detailed by an architect. Get it wrong, and you have fire-rated assemblies that void their listing, thresholds that violate ADA, or frames that corrode within five years.

On the PDD exam, Objective 2.3 asks you to resolve, detail, and document individual architectural systems. Doors and frames are one of the most detail-dense systems you will encounter. You need to know the difference between hollow metal frame types (welded vs. knock-down), understand how fire-rating labels work and what voids them, coordinate hardware with frame prep, and detail thresholds that satisfy both weatherproofing and accessibility requirements.

This topic connects directly to specifications (CSI Section 08 11 13 for steel doors, 08 71 00 for hardware), to code compliance (NFPA 80 for fire doors, ADA Section 404 for accessible doors), and to building envelope performance (flashing at exterior door openings). The exam will present scenarios where you must evaluate whether a proposed detail meets multiple overlapping requirements simultaneously. Every door in a building is a convergence point for multiple trades and code requirements, making thorough CD documentation at these locations essential for successful construction.