CCT Construction Materials & Labor Costs 5 — Questions and Answers
Question 1: Which of the following best describes 'spot market' purchasing versus 'contract purchasing' for construction materials?
- Spot market purchasing always yields lower prices due to competition
- Spot market purchasing is buying at current market prices without a long-term agreement, while contract purchasing locks in prices over a period (Correct answer)
- Contract purchasing exposes the owner to price escalation risk
- Spot market purchasing requires bulk quantity commitments
Correct answer: Spot market purchasing is buying at current market prices without a long-term agreement, while contract purchasing locks in prices over a period
Spot market purchases are at prevailing prices with no price guarantee, while supply contracts provide price certainty over a defined period.
Question 2: A cost estimator applies a 10% waste factor to 500 SF of ceramic tile needed for a bathroom. How many SF should be ordered?
- 510 SF
- 550 SF (Correct answer)
- 450 SF
- 505 SF
Correct answer: 550 SF
500 SF × 1.10 = 550 SF to order after accounting for the 10% waste allowance.
Question 3: In the context of construction labor costs, what is 'shift differential pay'?
- Additional pay for working in hazardous locations
- A premium wage paid to workers assigned to evening or night shifts (Correct answer)
- The difference in pay between union and non-union workers
- Overtime pay triggered after 40 hours per week
Correct answer: A premium wage paid to workers assigned to evening or night shifts
Shift differential is a wage premium added to the base rate to compensate workers for working non-standard hours such as evening or overnight shifts.
Question 4: Which of the following materials exhibits the HIGHEST volatility in market pricing, requiring the most frequent cost updates in an estimate?
- Precast concrete panels
- Structural lumber (dimensional softwood) (Correct answer)
- Standard masonry block
- Fiber cement siding
Correct answer: Structural lumber (dimensional softwood)
Dimensional lumber prices are highly volatile due to housing demand cycles, tariffs, and supply chain disruptions, requiring frequent estimate updates.
Question 5: A general contractor's labor burden rate is 42% of base wages. If a carpenter earns $38/hour base wage, what is the total labor cost per hour including burden?
- $43.96
- $53.96 (Correct answer)
- $15.96
- $80.00
Correct answer: $53.96
$38 × 1.42 = $53.96 per hour total labor cost including all burden costs.
Question 6: When a cost estimate separates 'material at job site' from 'material at source,' what additional cost elements are being captured?
- Material markup and profit only
- Freight, delivery, unloading, and handling costs to bring material from supplier to the point of installation (Correct answer)
- Storage and insurance costs only
- Sales tax and import duties only
Correct answer: Freight, delivery, unloading, and handling costs to bring material from supplier to the point of installation
The difference between source price and job-site price includes all transportation, delivery, and handling costs required to move material to the work location.
Question 7: Which of the following best explains why labor productivity in construction tends to decline in the latter stages of a large project?
- Workers receive pay increases as the project nears completion
- Congestion, out-of-sequence work, punch list items, and fatigue reduce efficiency near project closeout (Correct answer)
- Material quality decreases as project budgets are exhausted
- Subcontractors reduce crew sizes once their main scope is complete
Correct answer: Congestion, out-of-sequence work, punch list items, and fatigue reduce efficiency near project closeout
End-of-project conditions including crowded work areas, rework, punch lists, and worker fatigue consistently reduce productivity relative to early phases.
CCT Construction Materials & Labor Costs 5
Which of the following best describes 'spot market' purchasing versus 'contract purchasing' for construction materials?