Roof Sailing Roof Sailing MCQ 4 — Questions and Answers
Question 1: What is the primary function of ice and water shield installed at the eaves?
- To improve the aesthetic appearance of shingles
- To prevent water intrusion caused by ice dams and wind-driven rain (Correct answer)
- To add structural rigidity to the roof deck
- To reflect UV radiation
Correct answer: To prevent water intrusion caused by ice dams and wind-driven rain
Ice and water shield is a self-adhering membrane that seals around nails and prevents meltwater from ice dams or wind-driven rain from entering the structure.
Question 2: A roof with a 4:12 pitch rises how many inches for every foot of horizontal run?
- 4 inches (Correct answer)
- 12 inches
- 16 inches
- 8 inches
Correct answer: 4 inches
A 4:12 pitch means the roof rises 4 inches vertically for every 12 inches (1 foot) of horizontal run.
Question 3: Which of the following is considered a 'low-slope' roof by most US building codes?
- 6:12 pitch
- 2:12 pitch (Correct answer)
- 8:12 pitch
- 4:12 pitch
Correct answer: 2:12 pitch
Roofs with a pitch below 3:12 are classified as low-slope and require different waterproofing systems than steep-slope applications.
Question 4: What is the recommended minimum overlap for standard 3-tab asphalt shingles installed on a steep-slope roof?
- 1 inch
- 2 inches
- 5 inches (Correct answer)
- 12 inches
Correct answer: 5 inches
Manufacturer instructions and building codes typically require a 5-inch exposure with a 2-inch headlap, effectively creating a 5-inch overlap at each shingle course.
Question 5: When installing ridge cap shingles, in which direction should they be laid?
- Against the prevailing wind direction (Correct answer)
- Into the prevailing wind direction
- Parallel to the ridge
- Perpendicular to the rake
Correct answer: Against the prevailing wind direction
Ridge caps should be installed so the exposed tab faces away from prevailing winds, reducing the chance of wind lifting the overlapping cap.
Question 6: What type of nail is recommended for asphalt shingle installation to prevent corrosion?
- Bright steel common nail
- Hot-dipped galvanized or stainless steel roofing nail (Correct answer)
- Copper ring-shank nail
- Aluminum brad nail
Correct answer: Hot-dipped galvanized or stainless steel roofing nail
Hot-dipped galvanized or stainless steel roofing nails resist corrosion from moisture exposure and are specified by most shingle manufacturers.
Question 7: During a roof sailing inspection, you notice the valley flashing is only 12 inches wide total. What is the industry-standard minimum width?
- 12 inches
- 16 inches
- 24 inches (Correct answer)
- 36 inches
Correct answer: 24 inches
Open valley metal flashing should be a minimum of 24 inches wide so each side provides at least 12 inches of coverage, ensuring adequate water diversion.
Roof Sailing Roof Sailing MCQ 4
What is the primary function of ice and water shield installed at the eaves?