CCT Construction Materials & Labor Costs 3 — Questions and Answers
Question 1: In the context of labor productivity, what does an 'all-in rate' for a construction worker represent?
- The base hourly wage only
- Base wage plus all burdens including taxes, insurance, and fringe benefits (Correct answer)
- The worker's overtime rate
- The average wage across all crew members
Correct answer: Base wage plus all burdens including taxes, insurance, and fringe benefits
The all-in rate captures total employer cost per hour including base wage, payroll taxes, insurance, and benefits.
Question 2: Which factor most significantly causes material quantity 'waste allowances' to vary between different materials on a construction project?
- Project location and climate
- Material unit price
- Material form, cutting requirements, and installation method (Correct answer)
- The number of subcontractors on site
Correct answer: Material form, cutting requirements, and installation method
Waste allowances depend on how a material is shaped, cut, and placed; for example, tile requires more waste than pipe due to cuts at edges.
Question 3: A prevailing wage requirement on a public project primarily affects which component of the cost estimate?
- Material unit prices
- Equipment rental rates
- Labor cost per hour for covered trades (Correct answer)
- Overhead and profit markup
Correct answer: Labor cost per hour for covered trades
Prevailing wage laws (e.g., Davis-Bacon Act) set minimum wage and fringe rates for labor on covered public construction projects.
Question 4: Ready-mix concrete is typically sold in the US in which unit?
- Short tons
- Cubic yards (Correct answer)
- Cubic meters
- Square yards
Correct answer: Cubic yards
Ready-mix concrete is ordered, delivered, and priced per cubic yard in standard US construction practice.
Question 5: Which of the following best describes 'open-shop' versus 'union-shop' labor cost implications for a cost estimator?
- Union shops always produce lower total project costs due to higher productivity
- Open-shop wages are always lower than union wages for equivalent trades
- Union labor typically has higher all-in rates but may offer standardized fringes; open-shop rates vary regionally (Correct answer)
- There is no cost difference because both must pay prevailing wages
Correct answer: Union labor typically has higher all-in rates but may offer standardized fringes; open-shop rates vary regionally
Union all-in rates include negotiated fringes and are set by collective bargaining agreements, while open-shop rates vary by region and employer.
Question 6: Rebar (reinforcing steel) is measured and priced in construction estimates primarily by which unit?
- Linear feet
- Pounds or tons (Correct answer)
- Pieces
- Square feet of slab area
Correct answer: Pounds or tons
Reinforcing steel is quantified by weight (pounds or tons) because bar sizes have varying weights per linear foot.
Question 7: A productivity factor of 0.75 applied to a standard labor output rate means the crew will accomplish what percentage of the standard daily output?
- 133% of standard output
- 75% of standard output (Correct answer)
- 25% of standard output
- 175% of standard output
Correct answer: 75% of standard output
A productivity factor of 0.75 means the crew achieves 75% of the baseline output due to site conditions or other inefficiencies.
CCT Construction Materials & Labor Costs 3
In the context of labor productivity, what does an 'all-in rate' for a construction worker represent?