CSLB General Building (B)Planning and EstimatingEasy
A general contractor is estimating the quantity of plywood needed for the subfloor of a new residential building. The building footprint measures 40 feet by 60 feet. If standard plywood sheets are 4 feet by 8 feet, how many sheets are required, assuming no waste factor for simplicity?
- A75 sheets
- B85 sheets
- C70 sheets
- D80 sheets
Show answer & explanationAnswer & explanation
Correct answer: A. 75 sheets
First calculate the total area of the subfloor, then calculate the area of one plywood sheet. Divide the total subfloor area by the area of one sheet to find the number of sheets needed.
Why the other options are wrong
- B. This quantity is a significant overestimate, indicating a miscalculation in either area or sheets per area.
- C. This calculation is incorrect and does not account for the total area properly.
- D. This quantity is an overestimate, likely from an incorrect area calculation or division.
Plywood Sheet Calculation
Estimating the number of plywood sheets needed involves calculating the total area to be covered and dividing it by the area of a single standard plywood sheet.
- Standard plywood sheets are typically 4 ft x 8 ft.
- Area = Length x Width.
- Always consider a waste factor in real-world applications.
Memory trick: Area first, then divide by sheet size, simple math, no fuss.