Quantity Takeoff Methods Flashcards
7 cards from real CEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Quantity Takeoff Methods flashcards as text
The Prismatoid Formula provides a more accurate earthwork volume than the Average End Area method because it:
Answer: Incorporates a middle cross-section area to correct for curved volume transitions
The Prismatoid Formula includes the midpoint area with a weighting factor, correcting for the volume error introduced when end areas vary significantly.
In a piping systems takeoff, fittings are typically quantified separately from straight pipe runs because:
Answer: Fittings have unit costs that are priced individually and not included in linear foot pricing
Fittings (elbows, tees, reducers, etc.) are each priced as individual units, so they must be counted separately from the linear footage of straight pipe.
When taking off window quantities, which drawing sheet set is the MOST critical reference?
Answer: Window schedule and elevations
The window schedule lists each window type, size, quantity, and glazing specifications, while elevations show placement and configuration for verification.
The term 'pay quantity' in highway construction refers to:
Answer: The measured quantity of work actually performed and eligible for payment under contract terms
Pay quantity is the verified quantity of completed work measured in the field per contract specifications, which forms the basis for progress payment applications.
Which factor most commonly causes significant quantity discrepancies between an estimator's takeoff and the actual installed quantity of floor tile?
Answer: Cutting waste at room perimeters and around obstacles
Cut tiles at walls, corners, columns, and irregular shapes generate the largest waste, and the waste percentage increases significantly in small or complex rooms.
Model-based quantity takeoff (from BIM) differs from manual takeoff primarily because it:
Answer: Extracts quantities directly from the 3D model database, reducing manual measurement errors
BIM-based takeoff queries the digital model's embedded data to automatically calculate quantities, reducing transcription errors common in manual scaling.
Lumber for wood framing is typically quantified and purchased using which unit of measure?
Answer: Board feet or linear feet by member size
Dimension lumber is ordered and priced by linear feet for specific sizes (e.g., 2×4, 2×6) or by board feet, which accounts for both cross-section and length.