CSLB General Building (B)Mechanical, Electrical, Plumbing CoordinationEasy
A general contractor is scheduling inspections for a new residence before insulation and drywall installation begin. Which sequence correctly reflects standard rough-in inspection order?
- AInsulation, then plumbing/electrical/mechanical rough-in, then framing
- BDrywall, then framing, then rough-in trades, then insulation
- CFraming, then plumbing/electrical/mechanical rough-in, then insulation, then drywall
- DPlumbing/electrical/mechanical rough-in, then framing, then drywall, then insulation
Show answer & explanationAnswer & explanation
Correct answer: C. Framing, then plumbing/electrical/mechanical rough-in, then insulation, then drywall
Standard construction sequencing requires framing to be complete and inspected first, followed by rough-in of plumbing, electrical, and mechanical systems (often inspected together or in coordinated order), then insulation, and finally drywall to conceal the assemblies.
Why the other options are wrong
- A. Insulation cannot be installed before rough-in trades are complete and inspected.
- B. Drywall must never be installed before framing and rough-in inspections.
- D. Framing must precede rough-in trades since walls/ceilings must exist to route systems.
Standard Rough-In Sequence
Construction proceeds from structural framing to MEP rough-in, then insulation, then drywall closure, with inspections required at each stage before proceeding.
- Framing inspected before rough-in trades begin.
- Insulation inspected after rough-in but before drywall.
- Skipping sequence risks failed inspections and rework.
Memory trick: 'Frame it, wire/pipe/duct it, insulate it, then close it up.'