A modified bitumen roofing system is being installed on a 10,000 square foot roof. The membrane comes in rolls that are 3 feet wide and 100 feet long, with a required 6-inch overlap. How many rolls are needed?
Correct Answer
B) 45 rolls
Each roll covers 3 ft × 100 ft = 300 sq ft. With 6-inch overlap, effective width = 2.5 ft, so effective coverage = 2.5 × 100 = 250 sq ft per roll. Rolls needed = 10,000 ÷ 250 = 40 rolls, plus 10-15% waste factor = approximately 45 rolls.
Why This Is the Correct Answer
Each roll covers 3 ft × 100 ft = 300 sq ft. With 6-inch overlap, effective width = 2.5 ft, so effective coverage = 2.5 × 100 = 250 sq ft per roll. Rolls needed = 10,000 ÷ 250 = 40 rolls, plus 10-15% waste factor = approximately 45 rolls.
More NASCLA Questions
How long should daily reports and project correspondence typically be retained after project completion?
Which AIA document contains the general conditions that govern the rights and responsibilities of all parties in a construction contract?
A construction company has direct labor costs of $85,000, direct materials of $120,000, and overhead costs of $45,000 for a project. What is the total job cost?
What is the primary purpose of job cost accounting in construction?
A construction company has current assets of $350,000 and current liabilities of $280,000. What is the company's working capital?
In CSI MasterFormat, which division covers earthwork and site preparation?
On an electrical plan, a rectangle with three parallel lines inside typically represents:
In a mechanical drawing, what does 'CFM' typically measure?
In CSI MasterFormat Division 08, which of the following would typically be included?
On a mechanical plan, what does the symbol 'RTU' typically indicate?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass
Related Study Resources
Previous Question
A construction project has the following cash flow: Month 1: -$50,000, Month 2: -$75,000, Month 3: $25,000, Month 4: $100,000. What is the cumulative cash flow at the end of Month 3?
Next Question
A masonry crew of 4 workers has a productivity rate of 180 concrete blocks per day. If the hourly wage is $28 per worker and the project requires 3,600 blocks, what is the total labor cost?