Home Inspector Test Home Inspector Roofing Systems and Materials 3 — Questions and Answers
Question 1: What is the standard minimum headlap for asphalt roof shingles?
- 1 inch
- 2 inches (Correct answer)
- 3 inches
- 4 inches
Correct answer: 2 inches
A 2-inch minimum headlap is required for standard asphalt shingles to ensure water cannot penetrate between courses.
Question 2: Which roofing condition is described as 'fish-mouthing'?
- Shingles with raised lower edges creating an opening (Correct answer)
- Cracking along ridge caps
- Granule loss exposing the mat
- Moss growth lifting shingle tabs
Correct answer: Shingles with raised lower edges creating an opening
Fish-mouthing occurs when the lower edge of a shingle lifts away from the surface below it, creating an open gap resembling a fish's mouth.
Question 3: A home inspector notes that the roof deck shows sagging between rafters. What is the most likely cause?
- Improper shingle installation
- Inadequate decking thickness or rafter spacing (Correct answer)
- Excessive granule accumulation
- Ventilation ridge cap failure
Correct answer: Inadequate decking thickness or rafter spacing
Sagging between rafters (also called racking) typically results from decking that is too thin for the rafter spacing, or from structural rafter damage.
Question 4: What is the purpose of an ice and water shield membrane?
- To increase wind resistance of shingles
- To prevent water infiltration from ice dams and wind-driven rain (Correct answer)
- To add a reflective layer for energy efficiency
- To provide a slip-resistant surface for roofers
Correct answer: To prevent water infiltration from ice dams and wind-driven rain
Ice and water shield is a self-adhering membrane installed at eaves and valleys to block water from ice dams and wind-driven rain from entering the structure.
Question 5: Which of the following best describes step flashing?
- A continuous piece of metal run along a horizontal wall-roof junction
- Individual L-shaped metal pieces interwoven with shingles at a vertical wall (Correct answer)
- A pre-formed metal cap placed over a ridge
- Flashing installed at roof valleys only
Correct answer: Individual L-shaped metal pieces interwoven with shingles at a vertical wall
Step flashing consists of individual L-shaped metal pieces installed one per shingle course where a roof meets a vertical wall, directing water onto the shingles.
Question 6: A home inspector observes that a metal roof has exposed fasteners. What concern should be noted?
- Improper color selection
- Potential for leaks as fastener sealants degrade over time (Correct answer)
- Violation of fire rating requirements
- Incompatibility with underlayment
Correct answer: Potential for leaks as fastener sealants degrade over time
Exposed fastener metal roofs rely on neoprene washers and sealants that degrade over time, eventually allowing water infiltration at each fastener point.
Question 7: What roofing feature is designed to allow hot air to escape from an attic space at the highest point of the roof?
- Soffit vents
- Ridge vents (Correct answer)
- Gable vents
- Powered attic fans
Correct answer: Ridge vents
Ridge vents run along the peak of the roof, allowing hot air that rises to the apex of the attic to exhaust continuously.
Home Inspector Test Home Inspector Roofing Systems and Materials 3
What is the standard minimum headlap for asphalt roof shingles?