NYC Plasterer License Examination –
Full-Length Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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Question 1
Which material is most commonly used as the base coat in traditional three-
coat plaster systems?
A. Gypsum finish plaster
B. Lime putty
C. Portland cement plaster
D. Veneer plaster
Correct Answer: C
Rationale: Portland cement plaster provides strength, durability, and
moisture resistance, making it ideal for base coats in traditional systems.
,Question 2
What is the primary purpose of metal lath in plastering?
A. Decorative finish
B. Moisture barrier
C. Mechanical key for plaster adhesion
D. Thermal insulation
Correct Answer: C
Rationale: Metal lath creates a mechanical bond that allows plaster to grip
and adhere securely to surfaces.
Question 3
What NYC code governs construction safety requirements on job sites?
A. OSHA Federal Code
B. NYC Building Code
C. International Residential Code
D. Labor Law Section 240
Correct Answer: B
Rationale: The NYC Building Code establishes local construction and safety
standards applicable to plastering work.
Question 4
,What tool is primarily used to apply and smooth finish plaster?
A. Hawk
B. Darby
C. Float
D. Trowel
Correct Answer: D
Rationale: A trowel is designed for spreading, smoothing, and finishing
plaster surfaces accurately.
Question 5
What condition most commonly causes plaster cracking?
A. Proper curing
B. Controlled humidity
C. Rapid drying or shrinkage
D. Correct mix ratio
Correct Answer: C
Rationale: Rapid moisture loss leads to shrinkage stress, which results in
cracks.
Question 6
Which plaster mix component controls setting time?
A. Sand
, B. Lime
C. Gypsum
D. Aggregate
Correct Answer: C
Rationale: Gypsum determines how quickly plaster sets and hardens once
mixed with water.
Question 7
What is the minimum overlap required for metal lath seams?
A. ½ inch
B. 1 inch
C. 3 inches
D. 6 inches
Correct Answer: B
Rationale: A 1-inch overlap ensures continuity and structural integrity of
the plaster base.
Question 8
What safety equipment is required when mixing dry plaster materials?
A. Hearing protection
B. Safety boots
Full-Length Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which material is most commonly used as the base coat in traditional three-
coat plaster systems?
A. Gypsum finish plaster
B. Lime putty
C. Portland cement plaster
D. Veneer plaster
Correct Answer: C
Rationale: Portland cement plaster provides strength, durability, and
moisture resistance, making it ideal for base coats in traditional systems.
,Question 2
What is the primary purpose of metal lath in plastering?
A. Decorative finish
B. Moisture barrier
C. Mechanical key for plaster adhesion
D. Thermal insulation
Correct Answer: C
Rationale: Metal lath creates a mechanical bond that allows plaster to grip
and adhere securely to surfaces.
Question 3
What NYC code governs construction safety requirements on job sites?
A. OSHA Federal Code
B. NYC Building Code
C. International Residential Code
D. Labor Law Section 240
Correct Answer: B
Rationale: The NYC Building Code establishes local construction and safety
standards applicable to plastering work.
Question 4
,What tool is primarily used to apply and smooth finish plaster?
A. Hawk
B. Darby
C. Float
D. Trowel
Correct Answer: D
Rationale: A trowel is designed for spreading, smoothing, and finishing
plaster surfaces accurately.
Question 5
What condition most commonly causes plaster cracking?
A. Proper curing
B. Controlled humidity
C. Rapid drying or shrinkage
D. Correct mix ratio
Correct Answer: C
Rationale: Rapid moisture loss leads to shrinkage stress, which results in
cracks.
Question 6
Which plaster mix component controls setting time?
A. Sand
, B. Lime
C. Gypsum
D. Aggregate
Correct Answer: C
Rationale: Gypsum determines how quickly plaster sets and hardens once
mixed with water.
Question 7
What is the minimum overlap required for metal lath seams?
A. ½ inch
B. 1 inch
C. 3 inches
D. 6 inches
Correct Answer: B
Rationale: A 1-inch overlap ensures continuity and structural integrity of
the plaster base.
Question 8
What safety equipment is required when mixing dry plaster materials?
A. Hearing protection
B. Safety boots
