3.2 Trade Coordination
Key Takeaways
- Concrete is strong in compression but weak in tension, so reinforcing steel carries tensile forces.
- Control joints create planned crack locations in concrete slabs.
- Envelope details such as flashing and vapor control prevent water damage.
- MEP and electrical questions usually test coordination, safety, and basic system function.
General Contractor Depth
NASCLA trade questions are usually not specialist licensing questions. They test whether a general contractor understands what each trade is doing, what can fail, and where to find the controlling reference.
Trade Map
| Trade | High-yield idea |
|---|---|
| Concrete | Slump, curing, rebar, joints |
| Masonry | Mortar, grout, weeps, flashing |
| Metals | Connections, decking, erection safety |
| Wood | Framing, trusses, engineered members |
| Envelope | Roofing, waterproofing, insulation |
| Finishes | Gypsum, paint, flooring, ceilings |
| MEP | HVAC, plumbing, coordination |
| Electrical | Grounding, GFCI, disconnects |
Coordination Principle
Look for interface points. Structural steel supports decking. Flashing directs water out of masonry cavities. MEP penetrations affect firestopping. Control joints manage shrinkage cracks. A general contractor must coordinate these interfaces even when specialists perform the work.
Reference Strategy
For each trade, tab both concept pages and lookup tables. Memorize the common idea, then learn where exact values live. You do not need to memorize every clearance, cover, or slope if you can find it quickly and know which reference controls that trade question.
Coordination Cue
When trades overlap, identify the upstream work, inspection point, and downstream dependency before choosing a sequence.
What is the primary purpose of reinforcing steel in concrete?
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