AZ ROC – CR-39 Roofing Contractor
Examination Questions and Correct Answers
(Verified Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of roofing underlayment beneath
shingles or tile?
A. To provide structural support for the rafters
B. To replace the roof deck
C. To provide a secondary weather-resistant layer beneath the roof
covering
D. To increase attic ventilation
Rationale: Underlayment serves as a secondary barrier against
moisture that may penetrate the primary roof covering. It does not
replace the structural roof deck or provide the principal ventilation
function.
,2. Which roof component primarily supports the roofing materials and
transfers loads to the structural framing?
A. Drip edge
B. Underlayment
C. Flashing
D. Roof deck
Rationale: The roof deck is the structural surface installed over rafters
or trusses. Roofing materials and underlayment are generally installed
over the deck.
3. What is the principal purpose of a drip edge at the eaves?
A. Increase attic insulation
B. Direct water away from the roof edge and protect the deck edge
C. Replace valley flashing
D. Support ridge vents
Rationale: Drip edge helps control runoff at roof edges and protects
the edge of the roof deck from moisture. Proper installation also helps
direct water into the gutter system where gutters are present.
4. A roofing contractor discovers extensive deteriorated roof decking
during a reroofing project. What is the most appropriate first action?
,A. Cover the deterioration with shingles
B. Apply additional underlayment
C. Evaluate the extent of deterioration and address the
structural/decking issue before covering it
D. Install ridge ventilation
Rationale: Roofing materials should not be used to conceal unsound
decking. Deteriorated decking must be properly evaluated and
repaired or replaced as required before the finished roofing system is
installed.
5. What is the main function of flashing?
A. Increase roof insulation
B. Provide structural support
C. Prevent water intrusion at joints, penetrations, and changes in roof
plane
D. Replace roof sheathing
Rationale: Flashing is used at vulnerable locations such as walls,
chimneys, valleys, vents, and roof intersections. Its purpose is to direct
water away from potential entry points.
6. Which location is especially likely to require properly designed
flashing?
, A. Center of an uninterrupted roof slope
B. Middle of a large roof deck
C. Intersection between a roof and vertical wall
D. Interior attic insulation
Rationale: Roof-to-wall intersections create changes in plane where
water can accumulate or be redirected. Step flashing, counterflashing,
or other approved flashing systems may be required.
7. What is a roof valley?
A. The highest horizontal roof point
B. The intersection where two sloping roof planes meet and collect
runoff
C. The roof edge above the gutter
D. The attic floor
Rationale: Valleys receive runoff from two roof planes and therefore
require careful detailing. Improper valley construction can create
significant leakage problems.
8. What is the primary purpose of attic ventilation?
A. Eliminate the need for insulation
B. Prevent all roof leaks
Examination Questions and Correct Answers
(Verified Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of roofing underlayment beneath
shingles or tile?
A. To provide structural support for the rafters
B. To replace the roof deck
C. To provide a secondary weather-resistant layer beneath the roof
covering
D. To increase attic ventilation
Rationale: Underlayment serves as a secondary barrier against
moisture that may penetrate the primary roof covering. It does not
replace the structural roof deck or provide the principal ventilation
function.
,2. Which roof component primarily supports the roofing materials and
transfers loads to the structural framing?
A. Drip edge
B. Underlayment
C. Flashing
D. Roof deck
Rationale: The roof deck is the structural surface installed over rafters
or trusses. Roofing materials and underlayment are generally installed
over the deck.
3. What is the principal purpose of a drip edge at the eaves?
A. Increase attic insulation
B. Direct water away from the roof edge and protect the deck edge
C. Replace valley flashing
D. Support ridge vents
Rationale: Drip edge helps control runoff at roof edges and protects
the edge of the roof deck from moisture. Proper installation also helps
direct water into the gutter system where gutters are present.
4. A roofing contractor discovers extensive deteriorated roof decking
during a reroofing project. What is the most appropriate first action?
,A. Cover the deterioration with shingles
B. Apply additional underlayment
C. Evaluate the extent of deterioration and address the
structural/decking issue before covering it
D. Install ridge ventilation
Rationale: Roofing materials should not be used to conceal unsound
decking. Deteriorated decking must be properly evaluated and
repaired or replaced as required before the finished roofing system is
installed.
5. What is the main function of flashing?
A. Increase roof insulation
B. Provide structural support
C. Prevent water intrusion at joints, penetrations, and changes in roof
plane
D. Replace roof sheathing
Rationale: Flashing is used at vulnerable locations such as walls,
chimneys, valleys, vents, and roof intersections. Its purpose is to direct
water away from potential entry points.
6. Which location is especially likely to require properly designed
flashing?
, A. Center of an uninterrupted roof slope
B. Middle of a large roof deck
C. Intersection between a roof and vertical wall
D. Interior attic insulation
Rationale: Roof-to-wall intersections create changes in plane where
water can accumulate or be redirected. Step flashing, counterflashing,
or other approved flashing systems may be required.
7. What is a roof valley?
A. The highest horizontal roof point
B. The intersection where two sloping roof planes meet and collect
runoff
C. The roof edge above the gutter
D. The attic floor
Rationale: Valleys receive runoff from two roof planes and therefore
require careful detailing. Improper valley construction can create
significant leakage problems.
8. What is the primary purpose of attic ventilation?
A. Eliminate the need for insulation
B. Prevent all roof leaks
