100+ Free AZ ROC C-36 Plastering Practice Questions

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2026 Statistics

Key Facts: AZ ROC C-36 Plastering Exam

30 Questions

Official Question Count

PSI Candidate Information Bulletin

75 Minutes

Time Limit

PSI Candidate Information Bulletin

70%

Passing Score

Arizona Registrar of Contractors

$66

Exam Fee

PSI Services LLC

Open Book Computerized MCQ

Exam Format

PSI / AZ ROC Guidelines

100 Questions

Practice Question Bank

OpenExamPrep Practice Bank

The Arizona ROC C-36 Plastering Examination consists of 30 scored multiple-choice questions administered in a 75-minute open-book PSI computer-delivered session with a 70% passing threshold ($66 exam fee). This online practice bank provides 100 realistic English-language practice questions with comprehensive technical explanations adapted for exam preparation.

Sample AZ ROC C-36 Plastering Practice Questions

Try these sample questions to test your AZ ROC C-36 Plastering exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to ASTM C1063 and IBC Section 2510.6, what is the minimum required clearance between the bottom vertical edge of an exterior plaster weep screed and unpaved earth grade?

A.4 inches (102 mm)

B.2 inches (51 mm)

C.6 inches (152 mm)

D.1 inch (25 mm)

Explanation: ASTM C1063 and IBC Section 2510.6 specify that a corrosion-resistant weep screed installed at the bottom of exterior framed walls must terminate a minimum of 4 inches (102 mm) above unpaved earth grade. If terminating over paved surfaces like concrete driveways or patios, the minimum clearance is reduced to 2 inches (51 mm).

2When applying two layers of Grade D water-resistive barrier (WRB) over exterior sheathing prior to lathing, what is the minimum required horizontal and vertical overlap per IBC 2510?

A.1 inch horizontal and 3 inches vertical

B.2 inches horizontal and 6 inches vertical

C.4 inches horizontal and 4 inches vertical

D.6 inches horizontal and 12 inches vertical

Explanation: Per IBC Section 2510.6 and ASTM C1063, weather-resistive paper backing or building paper must be applied with horizontal laps of not less than 2 inches (51 mm) and vertical laps of not less than 6 inches (152 mm), shingled to shed water outwards.

3Under ASTM C932, which type of bonding agent is specifically formulated for exterior portland cement plaster applications subject to moisture exposure?

A.Interior polyvinyl acetate (PVA) non-re-emulsifiable bonding agent

B.Interior re-emulsifiable PVA bonding agent

C.Exterior acrylic or styrene-butadiene non-re-emulsifiable bonding agent

D.Water-soluble cellulose bonding solution

Explanation: ASTM C932 covers surface-applied bonding agents for exterior plastering. Non-re-emulsifiable acrylic or styrene-butadiene latex bonding agents must be used on exterior surfaces because re-emulsifiable PVA agents will re-soften and fail when exposed to ambient moisture, rain, or wet plaster mortar.

4If direct-applied portland cement plaster is to be applied to a smooth poured concrete wall without a bonding agent, how must the surface be mechanically prepared?

A.Acid washed with un-neutralized muriatic acid only

B.Smooth troweled and sealed with a curing compound

C.Painted with an oil-based primer

D.Abraded or bush-hammered to remove slick form oil and expose aggregate keys

Explanation: Smooth cast concrete surfaces contain form release agents and lack surface profile. To achieve direct plaster adhesion without a bonding agent, the surface must be sandblasted, bush-hammered, or mechanically scarified to remove form oils, efflorescence, and laitance, exposing a rough, open aggregate key.

5How should self-adhered flashing membrane at a window sill be integrated with the weather-resistive barrier (WRB) before installing stucco lath?

A.The sill flashing must extend over the lower WRB layer in a shingle fashion

B.The sill flashing must be tucked underneath all lower WRB layers

C.The WRB must completely cover the window glass and frame without trimming

D.The sill flashing should be omitted if paper-backed metal lath is installed

Explanation: Proper weatherproofing requires shingling principles: water flowing down must always shed over the exterior face. Sill flashing must lap over the lower WRB sheet below the window, while the top leg of the sill flashing goes behind the window jamb flashings and upper WRB layer.

6Why does ASTM C1063 require self-furring dimples or V-grooves on metal lath installed over solid substrates?

A.To allow the lath to expand during hot weather

B.To hold the lath 1/4 inch off the substrate so mortar can fully embed the metal strands

C.To reduce the weight of the metal lath panel

D.To serve as guidelines for cutting lath sheets with tin snips

Explanation: Self-furring dimples or V-grooves hold the metal lath approximately 1/4 inch (6.4 mm) away from solid sheathing or masonry. This clearance ensures mortar pushes behind the lath strands, completely embedding the metal for mechanical keying and structural strength.

7What is the primary purpose of dampening porous concrete masonry unit (CMU) walls immediately before applying a scratch coat of portland cement plaster?

A.To wash away all sand particles from the CMU surface

B.To cool down the plasterer's trowel during application

C.To control high suction so the masonry does not steal mixing water from the plaster

D.To freeze the surface mortar for rapid setting

Explanation: Dry, porous concrete blocks have high suction that rapidly absorbs water from fresh plaster mortar. Pre-wetting (dampening) the CMU controls suction, preventing premature drying, weak cement hydration, and shrinkage cracking of the scratch coat.

8When masking adjoining aluminum window frames and decorative trim prior to stucco application, when should protective tape and plastic film be removed?

A.Immediately after the scratch coat is applied while brown coat is wet

B.At least 30 days after finish coat painting is completed

C.Before applying the scratch coat to ensure plaster sticks to the frame

D.As soon as the finish coat has set firm to prevent tape adhesive transfer and edge tearing

Explanation: Masking tape and film should be removed as soon as the finish coat has set firm enough to hold a clean line. Leaving tape on window frames under sun exposure causes adhesive transfer, frame staining, and difficult removal.

9According to ASTM C1063, what is the maximum allowable wall surface area for a single stucco panel enclosed by control joints on framed exterior walls?

A.144 square feet (13.4 sq m)

B.250 square feet (23.2 sq m)

C.100 square feet (9.3 sq m)

D.300 square feet (27.9 sq m)

Explanation: ASTM C1063 specifies that individual exterior stucco wall panels bounded by control joints must not exceed 144 square feet (13.4 m²) in area. Additionally, no single dimension between joints shall exceed 18 feet, and the length-to-width ratio must not exceed 2.5:1.

10Where must an expansion joint be installed in exterior plaster systems to accommodate differential structural movement?

A.Only at the roof ridge line

B.At transitions between dissimilar substrate materials, such as wood frame to CMU masonry

C.Every 4 feet along all horizontal wall runs

D.Inside electrical outlet boxes behind wall plates

Explanation: Expansion joints (two-piece or main expansion joints) are required where plaster crosses structural building expansion joints, and at major substrate transitions (e.g., from wood framing to concrete block) due to differing thermal and moisture movement rates.

About the AZ ROC C-36 Plastering Exam

The Arizona ROC C-36 Plastering Examination is a computer-delivered, open-book trade examination administered by PSI Services LLC for the Arizona Registrar of Contractors. The examination evaluates knowledge of surface preparation, substrate priming, weather-resistive barriers, weep screed installation, traditional 3-coat portland cement stucco mixing and curing (ASTM C926), lathing materials and attachment (ASTM C1063), Exterior Insulation and Finish Systems (EIFS), veneer plaster, and OSHA 1926 safety regulations including silica protection and scaffolding.

Questions

30 scored questions

Time Limit

75 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC C-36 Plastering Exam Content Outline

17%

Surface Preparation and Setup

Substrate preparation, weather resistive barriers (WRB), flashings, weep screeds, bonding agents, masking, concrete surface keying, and expansion joint layouts.

17%

Stucco

Portland cement plaster chemistry, sand grading, lime types, water-cement ratios, acrylic additives, mix volumetric proportions, batching, and workability.

10%

Application and Installation

Hand troweling techniques, plaster pump machine operation, nozzle pressure, hose sizing, hawk and trowel handling, and scaffolding setup for application.

17%

Base and Finish Coat

Three-coat and two-coat stucco application, scratch coat scoring, brown coat rodding/darbying, moist curing intervals, finish textures, elastomeric coatings, and color uniformity.

13%

Rigid-Board and Reflective Insulation

Exterior Insulation and Finish Systems (EIFS), continuous rigid foam board attachment, mechanical fasteners, base coat mesh embedding, thermal breaks, and drainage planes.

17%

Plaster and Lath

Expanded metal lath, woven wire lath, paper-backed lath, corner beads, casing beads, control joint installation, fastener spacing, framing clearance, and gypsum/lime lathing.

10%

OSHA Safety

OSHA 29 CFR 1926 standards for plasterers, scaffolding planking/guardrails, fall protection, respirable crystalline silica (Table 1 / 1926.1153), eye protection, and Hazard Communication.

How to Pass the AZ ROC C-36 Plastering Exam

What You Need to Know

Passing score: 70%
Exam length: 30 questions
Time limit: 75 minutes
Exam fee: $66

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

AZ ROC C-36 Plastering Study Tips from Top Performers

1Memorize ASTM C926 thickness and curing requirements: 3/8 in scratch coat, 3/8 in brown coat, and 1/8 in finish coat for 3-coat stucco over metal lath (7/8 in total).

2Study ASTM C1063 installation rules for metal lath, including minimum 1-inch side/end laps, weep screed clearance (4 inches above grade, 2 inches above concrete), and control joint maximum area limits (144 sq ft).

3Master mix proportions: Scratch coat (1 part cement to 2.25-4 parts sand), Brown coat (1 part cement to 3-5 parts sand), and lime addition guidelines (Type S hydrated lime).

4Review EIFS installation procedures (ASTM C1397), including EPS foam board staggering, back-wrapping mesh, notch trowel adhesive coverage, and minimum 2.5-inch mesh overlaps.

5Understand OSHA 1926 regulations for plasterers: 10-foot scaffold fall protection height, minimum 6 to 12 inch plank overhangs, and Table 1 Respirable Crystalline Silica (1926.1153) engineering controls.

Frequently Asked Questions

How many questions are on the official Arizona ROC C-36 Plastering exam?

The official PSI C-36 Plastering exam contains 30 scored multiple-choice questions. Candidates are allotted 75 minutes to complete the test.

What passing score is required for the AZ ROC C-36 exam?

A minimum passing score of 70% (21 correct answers out of 30 questions) is required to pass the trade exam.

Is the Arizona ROC C-36 Plastering exam open book?

Yes, the exam is computer-delivered and open-book. Candidates may bring approved reference materials into the PSI testing center.

What topics carry the highest weight on the exam?

Surface Preparation and Setup, Stucco, Base and Finish Coat, and Plaster and Lath each carry 17% (5 questions each), totaling 68% of the exam.

Where can I schedule the AZ ROC C-36 Plastering exam?

Examinations are scheduled online through PSI Services LLC at https://test-takers.psiexams.com/azcon or by calling PSI candidate services.

100+ Free AZ ROC C-36 Plastering Practice Questions

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