The Nrca Roofing Manual Membrane Roof
Systems Latest Update 2025-2026 Exam 50
Questions with 100% Verified Correct Answers
with Rationale Guaranteed A+
Questions and Answers
• 1.
The following types of roof decks are addressed in this manual:
o A.
Cementitious wood-fiber panels
o B.
Lightweight insulating concrete
o C.
Steel
o D.
Structural concrete (cast-in-place, post-tensioned and precast/prestressed)
o E.
,Wood panels (plywood, oriented strand board/OSB)
o F.
Wood planks and wood boards
o G.
All of the listed are deck types addressed in the manual.
Correct Answer
G. All of the listed are deck types addressed in the manual.
Explanation
Chapter 1—Roof Decks - Page 13
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• 2.
Review the image and select the correct answer:
o A.
A = Side Lap, B = Exposure Lap, C = End Lap
o B.
A = Side Lap, B = End Lap, C = Bottom Lap
o C.
, A = Side Lap, B = Head Lap, C = End Lap
Correct Answer
C. A = Side Lap, B = Head Lap, C = End Lap
Explanation
The correct answer is A = Side Lap, B = Head Lap, C = End Lap. This is because in the
image, A is shown as overlapping the side of another material, indicating a side lap. B is
shown overlapping the top of another material, indicating a head lap. And C is shown
overlapping the end of another material, indicating an end lap.
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• 3.
The International Building Code, 2009 Edition indicates a design minimum slope of
_______________ is required for membrane roof systems, except for coal tar built-up
roof system where a design minimum of _______________ is permitted.
o A.
1/8:12 and 1/4:12
o B.
1⁄4:12 and 1⁄8:12
o C.
1⁄4:12 and 1⁄2:12
o D.
1⁄4:12 and 1⁄2:24
Correct Answer
B. 1⁄4:12 and 1⁄8:12
Explanation
Chapter 1—Roof Decks - Page 15
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• 4.
Roof decks should be sloped to provide positive drainage for a finished roof system.
The criterion for judging proper slope for drainage is that there be no ponding water on
the roof __________ hours after a rain during conditions conducive to drying.
Systems Latest Update 2025-2026 Exam 50
Questions with 100% Verified Correct Answers
with Rationale Guaranteed A+
Questions and Answers
• 1.
The following types of roof decks are addressed in this manual:
o A.
Cementitious wood-fiber panels
o B.
Lightweight insulating concrete
o C.
Steel
o D.
Structural concrete (cast-in-place, post-tensioned and precast/prestressed)
o E.
,Wood panels (plywood, oriented strand board/OSB)
o F.
Wood planks and wood boards
o G.
All of the listed are deck types addressed in the manual.
Correct Answer
G. All of the listed are deck types addressed in the manual.
Explanation
Chapter 1—Roof Decks - Page 13
Rate this question:
• 2.
Review the image and select the correct answer:
o A.
A = Side Lap, B = Exposure Lap, C = End Lap
o B.
A = Side Lap, B = End Lap, C = Bottom Lap
o C.
, A = Side Lap, B = Head Lap, C = End Lap
Correct Answer
C. A = Side Lap, B = Head Lap, C = End Lap
Explanation
The correct answer is A = Side Lap, B = Head Lap, C = End Lap. This is because in the
image, A is shown as overlapping the side of another material, indicating a side lap. B is
shown overlapping the top of another material, indicating a head lap. And C is shown
overlapping the end of another material, indicating an end lap.
Rate this question:
• 3.
The International Building Code, 2009 Edition indicates a design minimum slope of
_______________ is required for membrane roof systems, except for coal tar built-up
roof system where a design minimum of _______________ is permitted.
o A.
1/8:12 and 1/4:12
o B.
1⁄4:12 and 1⁄8:12
o C.
1⁄4:12 and 1⁄2:12
o D.
1⁄4:12 and 1⁄2:24
Correct Answer
B. 1⁄4:12 and 1⁄8:12
Explanation
Chapter 1—Roof Decks - Page 15
Rate this question:
• 4.
Roof decks should be sloped to provide positive drainage for a finished roof system.
The criterion for judging proper slope for drainage is that there be no ponding water on
the roof __________ hours after a rain during conditions conducive to drying.
