A roof area measures 2,400 square feet. If asphalt shingles have a coverage rate of 98.4 square feet per bundle and 15% waste is anticipated, how many bundles are needed?
Correct Answer
D) 28 bundles
Total area with waste = 2,400 × 1.15 = 2,760 sq ft. Bundles needed = 2,760 ÷ 98.4 = 28.05, rounded up to 28 bundles. Including waste factor ensures adequate material for cuts and installation losses.
Why This Is the Correct Answer
To calculate bundles needed: First, add 15% waste to the roof area: 2,400 × 1.15 = 2,760 square feet. Then divide by coverage per bundle: 2,760 ÷ 98.4 = 28.05 bundles. Since you cannot purchase partial bundles, this rounds to 28 bundles. The waste factor accounts for cuts, damaged materials, and installation losses typical in roofing projects.
Why the Other Options Are Wrong
Option A: 32 bundles
32 bundles results from incorrectly calculating the waste factor or using wrong coverage rates. This would provide excessive material, leading to unnecessary costs and waste on the job site.
Option B: 26 bundles
26 bundles fails to account for the 15% waste factor. This calculation uses only the base roof area (2,400 ÷ 98.4 ≈ 24.4, rounded up to 26), which would result in insufficient materials for proper installation.
Option C: 30 bundles
30 bundles represents an overcalculation, possibly from using an incorrect waste percentage (around 22% instead of 15%) or mathematical errors in the division process.
Memory Technique
Remember 'WAD': Waste Added, Divide. First add waste percentage to total area, then divide by coverage per bundle. Always round UP for material quantities.
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass