When performing quantity takeoff for concrete work, a contractor measures 150 cubic yards needed but orders 165 cubic yards. What does the additional 15 cubic yards most likely represent?
Correct Answer
B) Waste allowance for normal construction losses
The additional 10% (15 cubic yards out of 150) represents a typical waste allowance for concrete work. Waste allowances account for normal construction losses due to spillage, over-excavation, form tolerances, and other factors inherent in the construction process.
Why This Is the Correct Answer
The additional 15 cubic yards represents a 10% waste allowance (15÷150 = 0.10 or 10%), which is standard practice in concrete work. Waste allowances are built into quantity takeoffs to account for inevitable losses during construction such as spillage during transport and placement, over-excavation beyond design dimensions, form tolerances that may require additional concrete, and material left in trucks and equipment. This is a normal part of the estimating process and is distinct from design changes, cost escalation, or profit calculations.
Why the Other Options Are Wrong
Option A: Design contingency for scope changes
Profit margin is calculated as a percentage of total costs and is applied to the final estimate, not embedded within the material quantities. Profit margins are typically shown as separate line items and would not be expressed as additional concrete yardage.
Option C: Profit margin on materials
Design contingency would be a separate line item for potential scope changes and would typically be a percentage of the total project cost, not specifically tied to the exact quantity of concrete measured. Design contingencies are usually much larger percentages and are applied at the project level.
Memory Technique
Remember 'WASTE = What Actually Spills, Tips, and Escapes' - concrete work always has inherent losses that must be accounted for in ordering
Reference Hint
Look up 'Waste Allowances' or 'Material Waste Factors' in estimating reference books, typically found in the concrete or estimating fundamentals chapters
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