A mechanical contractor installs ductwork 18 inches from its designed location due to a structural conflict. The original design showed the duct at elevation 12'-6" and it was installed at elevation 11'-0". What should be documented in the as-built drawings?
Correct Answer
B) The actual installed elevation of 11'-0"
As-built drawings should show the actual installed conditions, which is the 11'-0" elevation. The reason for the change should be documented separately in project records or RFIs.
Why This Is the Correct Answer
As-built drawings are legal documents that must accurately reflect the actual installed conditions of the project. Their primary purpose is to show what was actually constructed, not what was originally designed. The actual elevation of 11'-0" is what exists in the field and what future maintenance, renovations, or inspections will encounter. While the reason for changes should be documented, it belongs in separate project records like RFIs, change orders, or project logs rather than cluttering the as-built drawings.
Why the Other Options Are Wrong
Option C: No documentation is needed since it's within acceptable tolerance
Showing the original elevation of 12'-6" would be documenting the design intent rather than the actual installed condition, which defeats the purpose of as-built drawings that must reflect reality.
Option D: The original elevation of 12'-6"
While documenting both elevations might seem thorough, as-built drawings should show only the actual installed conditions to avoid confusion and maintain clarity for future users of the drawings.
Memory Technique
Think 'AS-BUILT = AS IT IS' - the drawings must show reality, not the original plan. The word 'built' refers to what actually got constructed.
Reference Hint
Florida Building Code Chapter 1, Administrative provisions regarding construction documents and as-built requirements, or project administration sections in contractor reference materials
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