ICC Masonry Exam Study Guide Updated
2026 | Verified Questions & Answers with
Detailed Rationales | Masonry Codes,
Construction Standards, Brickwork & ICC
Certification Prep
• This study guide contains 200 verified ICC Masonry exam questions with detailed
RATIONALE designed to help you master masonry codes, construction standards,
brickwork, and ICC certification requirements.
• Use this material by reading each question carefully, selecting your answer before
checking the highlighted correct option, and studying the RATIONALE to reinforce
code-based reasoning for exam day.
ICC MASONRY EXAM STUDY GUIDE — 200 QUESTIONS
1. What is the minimum compressive strength of Type S mortar?
A. 750 psi
B. 1000 psi
C. 1800 psi
D. 2500 psi
E. 3000 psi
CORRECT ANSWER: C. 1800 psi
RATIONALE: Type S mortar has a minimum compressive strength of 1800 psi at 28 days
per ASTM C270. It is commonly used in below-grade masonry and areas subject to
lateral forces.
2. Which mortar type is recommended for use in below-grade exterior walls?
A. Type K
B. Type N
,C. Type O
D. Type M
E. Type G
CORRECT ANSWER: D. Type M
RATIONALE: Type M mortar has the highest compressive strength (2500 psi minimum)
and is best suited for below-grade applications, retaining walls, and areas in contact
with the earth.
3. What is the standard nominal size of a modular brick?
A. 3⅝ × 2¼ × 7⅝ inches
B. 4 × 2⅔ × 8 inches
C. 3½ × 2½ × 8 inches
D. 4 × 3 × 9 inches
E. 3¾ × 2½ × 8½ inches
CORRECT ANSWER: B. 4 × 2⅔ × 8 inches
RATIONALE: The nominal dimensions of a standard modular brick are 4 × 2⅔ × 8
inches. The actual dimensions are smaller to accommodate mortar joints, typically 3⅝ ×
2¼ × 7⅝ inches.
4. What is the maximum allowable height of a masonry unit for unreinforced
masonry construction?
A. 4 inches
B. 6 inches
C. 8 inches
D. 10 inches
,E. 12 inches
CORRECT ANSWER: C. 8 inches
RATIONALE: Per the International Building Code, the maximum allowable height of a
masonry unit in unreinforced construction is 8 inches. This ensures structural stability
and proper load distribution.
5. What ASTM standard governs the specification for mortar for unit
masonry?
A. ASTM C90
B. ASTM C270
C. ASTM C476
D. ASTM C150
E. ASTM C216
CORRECT ANSWER: B. ASTM C270
RATIONALE: ASTM C270 is the standard specification for mortar for unit masonry,
covering proportions and properties of mortar types M, S, N, and O.
6. According to the IBC, what is the minimum thickness of a masonry bearing
wall?
A. 4 inches
B. 6 inches
C. 8 inches
D. 10 inches
E. 12 inches
CORRECT ANSWER: C. 8 inches
, RATIONALE: The IBC requires that masonry bearing walls have a minimum nominal
thickness of 8 inches to adequately carry and distribute vertical loads.
7. Which of the following describes a Flemish bond pattern?
A. All headers in every course
B. Alternating stretchers and headers in each course
C. All stretchers in every course
D. Headers in every third course
E. Alternating courses of all headers and all stretchers
CORRECT ANSWER: B. Alternating stretchers and headers in each course
RATIONALE: Flemish bond consists of alternating stretcher and header bricks within
each course, creating a decorative and structurally sound pattern widely used in
traditional masonry.
8. What is the minimum lap required for reinforcing bars in masonry walls?
A. 12 bar diameters
B. 24 bar diameters
C. 36 bar diameters
D. 48 bar diameters
E. 60 bar diameters
CORRECT ANSWER: D. 48 bar diameters
RATIONALE: The minimum lap splice length for reinforcing bars in masonry is 48 bar
diameters per TMS 402, ensuring adequate load transfer between bars.
9. What does the term "wythe" refer to in masonry construction?
2026 | Verified Questions & Answers with
Detailed Rationales | Masonry Codes,
Construction Standards, Brickwork & ICC
Certification Prep
• This study guide contains 200 verified ICC Masonry exam questions with detailed
RATIONALE designed to help you master masonry codes, construction standards,
brickwork, and ICC certification requirements.
• Use this material by reading each question carefully, selecting your answer before
checking the highlighted correct option, and studying the RATIONALE to reinforce
code-based reasoning for exam day.
ICC MASONRY EXAM STUDY GUIDE — 200 QUESTIONS
1. What is the minimum compressive strength of Type S mortar?
A. 750 psi
B. 1000 psi
C. 1800 psi
D. 2500 psi
E. 3000 psi
CORRECT ANSWER: C. 1800 psi
RATIONALE: Type S mortar has a minimum compressive strength of 1800 psi at 28 days
per ASTM C270. It is commonly used in below-grade masonry and areas subject to
lateral forces.
2. Which mortar type is recommended for use in below-grade exterior walls?
A. Type K
B. Type N
,C. Type O
D. Type M
E. Type G
CORRECT ANSWER: D. Type M
RATIONALE: Type M mortar has the highest compressive strength (2500 psi minimum)
and is best suited for below-grade applications, retaining walls, and areas in contact
with the earth.
3. What is the standard nominal size of a modular brick?
A. 3⅝ × 2¼ × 7⅝ inches
B. 4 × 2⅔ × 8 inches
C. 3½ × 2½ × 8 inches
D. 4 × 3 × 9 inches
E. 3¾ × 2½ × 8½ inches
CORRECT ANSWER: B. 4 × 2⅔ × 8 inches
RATIONALE: The nominal dimensions of a standard modular brick are 4 × 2⅔ × 8
inches. The actual dimensions are smaller to accommodate mortar joints, typically 3⅝ ×
2¼ × 7⅝ inches.
4. What is the maximum allowable height of a masonry unit for unreinforced
masonry construction?
A. 4 inches
B. 6 inches
C. 8 inches
D. 10 inches
,E. 12 inches
CORRECT ANSWER: C. 8 inches
RATIONALE: Per the International Building Code, the maximum allowable height of a
masonry unit in unreinforced construction is 8 inches. This ensures structural stability
and proper load distribution.
5. What ASTM standard governs the specification for mortar for unit
masonry?
A. ASTM C90
B. ASTM C270
C. ASTM C476
D. ASTM C150
E. ASTM C216
CORRECT ANSWER: B. ASTM C270
RATIONALE: ASTM C270 is the standard specification for mortar for unit masonry,
covering proportions and properties of mortar types M, S, N, and O.
6. According to the IBC, what is the minimum thickness of a masonry bearing
wall?
A. 4 inches
B. 6 inches
C. 8 inches
D. 10 inches
E. 12 inches
CORRECT ANSWER: C. 8 inches
, RATIONALE: The IBC requires that masonry bearing walls have a minimum nominal
thickness of 8 inches to adequately carry and distribute vertical loads.
7. Which of the following describes a Flemish bond pattern?
A. All headers in every course
B. Alternating stretchers and headers in each course
C. All stretchers in every course
D. Headers in every third course
E. Alternating courses of all headers and all stretchers
CORRECT ANSWER: B. Alternating stretchers and headers in each course
RATIONALE: Flemish bond consists of alternating stretcher and header bricks within
each course, creating a decorative and structurally sound pattern widely used in
traditional masonry.
8. What is the minimum lap required for reinforcing bars in masonry walls?
A. 12 bar diameters
B. 24 bar diameters
C. 36 bar diameters
D. 48 bar diameters
E. 60 bar diameters
CORRECT ANSWER: D. 48 bar diameters
RATIONALE: The minimum lap splice length for reinforcing bars in masonry is 48 bar
diameters per TMS 402, ensuring adequate load transfer between bars.
9. What does the term "wythe" refer to in masonry construction?
