Roof Sailing Roof Sailing Navigation and Techniques 2 — Questions and Answers
Question 1: Which direction should shingles be installed on a roof to ensure proper water drainage?
- From ridge to eave
- From eave to ridge, overlapping upslope shingles over downslope shingles (Correct answer)
- Horizontally across the rake edge
- Diagonally from corner to corner
Correct answer: From eave to ridge, overlapping upslope shingles over downslope shingles
Shingles are installed starting at the eave and working up to the ridge, with each course overlapping the one below to shed water downslope.
Question 2: What technique is used to ensure courses of shingles remain straight across a wide roof?
- Freehand installation by eye
- Chalk line snapping at measured intervals from the eave (Correct answer)
- Following the edge of the rake board
- Using only a straight-edge ruler at each side
Correct answer: Chalk line snapping at measured intervals from the eave
Chalk lines are snapped at regular intervals perpendicular to the rake to create reference lines that keep shingle courses straight across the entire roof.
Question 3: What is 'racking' in shingle installation and why is it generally discouraged?
- Installing shingles in a pyramid pattern from center outward
- Running shingles straight up the roof in vertical columns, which creates aligned joints that allow water infiltration (Correct answer)
- Removing old shingles with a racking fork tool
- Nailing shingles too high, known as high nailing
Correct answer: Running shingles straight up the roof in vertical columns, which creates aligned joints that allow water infiltration
Racking aligns vertical joints in adjacent courses, creating a path for wind-driven water infiltration and is generally prohibited by shingle manufacturers.
Question 4: What is the minimum recommended headlap for standard three-tab asphalt shingles?
- 1 inch
- 2 inches (Correct answer)
- 3 inches
- 4 inches
Correct answer: 2 inches
Three-tab shingles require a minimum 2-inch headlap (overlap of the shingle above over the shingle two courses below) to provide waterproofing redundancy.
Question 5: What is the correct nail placement zone for standard asphalt shingles according to manufacturer specifications?
- Through the top edge of the shingle
- In the nailing zone just above the adhesive strip (Correct answer)
- Below the exposure line (in the tab cutout area)
- At the very center of the shingle
Correct answer: In the nailing zone just above the adhesive strip
Nails must be driven in the manufacturer-designated nailing zone, typically just above the adhesive strip, to ensure proper holding power and waterproofing.
Question 6: What is starter course shingles' primary function at the eave?
- Adding decorative border to the roofline
- Providing a solid backing surface under the first course tab cutouts to prevent water entry (Correct answer)
- Raising the first course to create the proper exposure
- Providing additional weight at the eave edge
Correct answer: Providing a solid backing surface under the first course tab cutouts to prevent water entry
Starter strips fill the spaces behind tab cutouts in the first full course, preventing wind-driven rain from entering through those gaps at the eave.
Roof Sailing Roof Sailing Navigation and Techniques 2
Which direction should shingles be installed on a roof to ensure proper water drainage?