Page 1 of 182
BUILDING CONTRACTOR TRADE 2026/2027
EXAM REAL QUESTIONS WITH WELL
ELABORATED ANSWERS (100% CORRECT
VERIFIED SOLUTIONS) LATEST UPDATED
VERSION GUARANTEED PASS A+
Question 1
A new single-family home has a second-floor balcony 34
inches above grade. Does it require a guardrail per IRC
2018?
A) No, because it is less than 36 inches
B) Yes, any balcony requires a railing
,Page 2 of 182
C) No, because it is under 30 inches
D) Yes, because it exceeds 30 inches
Correct Answer: D) Yes
Rationale: IRC 2018 R312.1 requires guardrails where the
drop exceeds 30 inches. 34 inches > 30 inches, so a guardrail
is required.
Question 2
What is the minimum required height for a residential
guardrail?
A) 30 inches
B) 32 inches
C) 34 inches
D) 36 inches
Correct Answer: D) 36 inches
Rationale: IRC 2018 R312.2 — minimum 36 inches for
residential. Commercial (IBC) requires 42 inches.
,Page 3 of 182
Question 3
You are framing a 10-foot wall with 2x4 studs 16 inches on
center. How many studs are needed for the wall length
(excluding corners and openings)?
A) 7
B) 8
C) 9
D) 10
Correct Answer: C) 9
Rationale: (120 inches / 16 inches) + 1 = 7.5 + 1 = 8.5 →
round up to 9 studs. Formula: (length in inches / spacing) + 1.
Question 4
A deck ledger board is attached to a 2x4 wood stud wall.
What is the minimum length for lag screws attaching the
ledger?
A) 2-1/2 inches
B) 3 inches
, Page 4 of 182
C) 4 inches
D) 5 inches
Correct Answer: B) 3 inches
Rationale: IRC 2018 R507.9.1.2 requires lag screws to
penetrate at least 1-1/2 inches into the stud. With 1-1/2 inch
ledger + 1/2 inch gap + 1-1/2 inch stud penetration = 3
inches minimum.
Question 5
A concrete footing is poured in freezing climate. Frost depth is
24 inches. Footing must bear on undisturbed soil. Minimum
depth below grade?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
BUILDING CONTRACTOR TRADE 2026/2027
EXAM REAL QUESTIONS WITH WELL
ELABORATED ANSWERS (100% CORRECT
VERIFIED SOLUTIONS) LATEST UPDATED
VERSION GUARANTEED PASS A+
Question 1
A new single-family home has a second-floor balcony 34
inches above grade. Does it require a guardrail per IRC
2018?
A) No, because it is less than 36 inches
B) Yes, any balcony requires a railing
,Page 2 of 182
C) No, because it is under 30 inches
D) Yes, because it exceeds 30 inches
Correct Answer: D) Yes
Rationale: IRC 2018 R312.1 requires guardrails where the
drop exceeds 30 inches. 34 inches > 30 inches, so a guardrail
is required.
Question 2
What is the minimum required height for a residential
guardrail?
A) 30 inches
B) 32 inches
C) 34 inches
D) 36 inches
Correct Answer: D) 36 inches
Rationale: IRC 2018 R312.2 — minimum 36 inches for
residential. Commercial (IBC) requires 42 inches.
,Page 3 of 182
Question 3
You are framing a 10-foot wall with 2x4 studs 16 inches on
center. How many studs are needed for the wall length
(excluding corners and openings)?
A) 7
B) 8
C) 9
D) 10
Correct Answer: C) 9
Rationale: (120 inches / 16 inches) + 1 = 7.5 + 1 = 8.5 →
round up to 9 studs. Formula: (length in inches / spacing) + 1.
Question 4
A deck ledger board is attached to a 2x4 wood stud wall.
What is the minimum length for lag screws attaching the
ledger?
A) 2-1/2 inches
B) 3 inches
, Page 4 of 182
C) 4 inches
D) 5 inches
Correct Answer: B) 3 inches
Rationale: IRC 2018 R507.9.1.2 requires lag screws to
penetrate at least 1-1/2 inches into the stud. With 1-1/2 inch
ledger + 1/2 inch gap + 1-1/2 inch stud penetration = 3
inches minimum.
Question 5
A concrete footing is poured in freezing climate. Frost depth is
24 inches. Footing must bear on undisturbed soil. Minimum
depth below grade?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
