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100+ Free Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Practice Questions

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2026 Statistics

Key Facts: Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Exam

AZ ROC B-1/B-2/KB-1/KB-2

Exam Code / Label

Arizona Registrar of Contractors / PSI

100 Questions

Official Question Count

PSI Candidate Information Bulletin

240 Minutes (4 Hours)

Time Limit

PSI Candidate Information Bulletin

70% (70 / 100)

Passing Score

PSI Candidate Information Bulletin

$66

Exam Fee

PSI Candidate Information Bulletin

Open-Book Computer Test

Exam Format

PSI Testing Services

NASCLA Accredited Commercial Building Exam

Alternative Waiver

Arizona Registrar of Contractors

Prepare for the 2026 Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building trade examination with 100 realistic practice questions matching the official PSI blueprint. The official open-book exam comprises 100 scored questions, a 240-minute (4-hour) time limit, and a 70% passing score ($66 exam fee administered by PSI). This practice question bank is an English-language MCQ study adaptation covering sitework, concrete, masonry, structural steel, wood framing, roofing, doors/windows, finishes, OSHA safety, and IBC/IRC building codes.

Sample Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Practice Questions

Try these sample questions to test your Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under OSHA 29 CFR 1926 Subpart P, what is the maximum unconfined compressive strength threshold for cohesive soil to be classified as Type A soil?
A.0.5 tons per square foot (tsf)
B.1.5 tons per square foot (tsf)
C.2.5 tons per square foot (tsf)
D.4.0 tons per square foot (tsf)
Explanation: OSHA 1926 Subpart P Appendix A defines Type A soil as cohesive soil with an unconfined compressive strength of 1.5 tons per square foot (tsf) (144 kPa) or greater. Examples include clay, silty clay, sandy clay, and clay loam. Soil cannot be Type A if it is fissured, subject to vibration, previously disturbed, or seeping water.
2A soil sample tested using the Modified Proctor Test (ASTM D1557) achieves a maximum dry density of 124.0 pcf at an optimum moisture content of 11.5%. During field quality control testing, a nuclear density gauge measures a wet density of 134.4 pcf at a moisture content of 12.0%. What is the relative compaction percentage, and does it satisfy a specification requiring 95% Modified Proctor density?
A.92.5%, which fails specification
B.94.0%, which fails specification
C.96.8%, which meets specification
D.98.2%, which meets specification
Explanation: First, calculate field dry density: Field Dry Density = Wet Density / (1 + Moisture Content) = 134.4 / 1.120 = 120.0 pcf. Next, calculate relative compaction: (Field Dry Density / Max Dry Density) * 100 = (120.0 / 124.0) * 100 = 96.77% (or 96.8%). Since 96.8% >= 95.0%, the compaction meets specification.
3A contractor must excavate a trench measuring 400 feet long, 6 feet wide, and 8 feet deep. If the undisturbed soil in bank cubic yards (BCY) has a swell factor of 25% when excavated into loose cubic yards (LCY), how many loose cubic yards of material must be hauled away by dump trucks?
A.888.9 LCY
B.711.1 LCY
C.640.0 LCY
D.960.0 LCY
Explanation: First calculate bank volume in cubic feet: V = 400 ft * 6 ft * 8 ft = 19,200 cu ft. Convert to bank cubic yards (BCY): BCY = 19,200 / 27 = 711.11 BCY. Apply the 25% swell factor for loose volume: LCY = BCY * (1 + 0.25) = 711.11 * 1.25 = 888.89 LCY (or 888.9 LCY).
4According to IBC Section 1804.4, what is the minimum required slope away from a building foundation wall for unpaved ground surface, and over what minimum distance must it be maintained?
A.1% slope (1/8 inch per foot) for 5 feet
B.2% slope (1/4 inch per foot) for 8 feet
C.3% slope (3/8 inch per foot) for 6 feet
D.5% slope (6 inches drop) for 10 feet
Explanation: IBC Section 1804.4 (and IRC R401.3) requires ground surface immediately adjacent to foundation walls to be sloped down away from the structure at a minimum of 5% (1 unit vertical in 20 units horizontal, or 6 inches drop) for a minimum horizontal distance of 10 feet. Exception: Where physical obstructions prevent 10 feet of slope, swales or paved aprons are permitted.
5Per IBC Table 1806.2 (Presumptive Load-Bearing Values), what is the official default presumptive allowable foundation pressure for sandy gravel and/or gravel soils in the absence of a site-specific geotechnical report?
A.1,500 psf
B.3,000 psf
C.4,000 psf
D.12,000 psf
Explanation: IBC Table 1806.2 establishes default presumptive load-bearing values: Crystalline bedrock = 12,000 psf; Sedimentary and foliated rock = 4,000 psf; Sandy gravel and/or gravel = 3,000 psf; Sand, silty sand, clayey sand, silty gravel and clayey gravel = 2,000 psf; Clay, sandy clay, silty clay, clayey silt, silt and sandy silt = 1,500 psf.
6When installing a subterranean French drain system around a foundation perimeter to intercept high groundwater, what is the primary function of wrapping the aggregate pocket with a non-woven geotextile filter fabric?
A.To prevent fine soil particles from migrating into and clogging the gravel reservoir and perforated pipe
B.To increase the structural load capacity of the overburden soil above the drain pipe
C.To seal out water completely and act as a primary vapor barrier for the footing
D.To accelerate concrete curing of adjacent spread footings by retaining soil moisture
Explanation: Non-woven geotextile filter fabric acts as a soil retention barrier while allowing groundwater to pass freely. Placing geotextile fabric between native backfill soil and the clean crushed stone aggregate prevents fine silts and clays from washing into soil voids, preserving aggregate permeability and preventing pipe clogging.
7In segmental retaining wall (SRW) design, what is the standard recommended minimum geogrid reinforcement embedment length expressed as a ratio of total wall height (H) for typical soil and surcharge conditions?
A.0.3 H to 0.4 H
B.0.5 H to 0.6 H
C.0.7 H to 0.8 H
D.1.2 H to 1.5 H
Explanation: In segmental retaining wall design (NCMA standards), the minimum primary geogrid embedment length is typically 60% to 70% (0.6 H to 0.7 H) of the total wall height H, with 0.7 H to 0.8 H widely specified as standard engineering practice for slopes, surcharges, or poor soils, and never less than 4 feet.
8To prevent severe hydrostatic pressure accumulation behind a cast-in-place concrete retaining wall, which drainage detail must be incorporated near the base of the wall?
A.Horizontal expansion joint material placed at 4-foot vertical intervals
B.3-mil polyethylene sheeting adhered directly to the backface of the wall
C.Closed-cell spray foam insulation applied to the heel of the footing
D.Weep holes placed at or near grade level with free-draining granular backfill
Explanation: Hydrostatic water pressure is the leading cause of retaining wall structural failure. Providing weep holes (typically 2 to 4 inches in diameter spaced 4 to 10 feet apart) near the bottom of the wall, backed with free-draining crushed stone filter aggregate, allows trapped water to discharge freely and relieves lateral hydrostatic pressure.
9A structural steel column delivers an ultimate dead plus live design load of 180,000 pounds (180 kips) to a square concrete spread footing resting on soil with an allowable bearing capacity of 3,000 psf. What is the minimum required side length of the square spread footing?
A.6.0 feet
B.7.8 feet
C.8.5 feet
D.10.0 feet
Explanation: Required footing area A = Load / Allowable Soil Capacity = 180,000 lbs / 3,000 psf = 60 sq ft. For a square footing, side length B = sqrt(60) = 7.746 feet. Rounding up to standard construction increments gives a 7.75 ft or 7.8 ft square footing.
10A continuous concrete grade beam footing measures 300 feet long, 24 inches wide, and 12 inches deep. Allowing a 10% waste factor for ground irregularities, how many cubic yards of ready-mix concrete should be ordered?
A.24.4 cubic yards
B.22.2 cubic yards
C.18.5 cubic yards
D.26.7 cubic yards
Explanation: First calculate net volume in cubic feet: V = 300 ft * 2 ft * 1 ft = 600 cu ft. Convert to cubic yards: 600 / 27 = 22.22 cu yd. Multiply by 1.10 for waste factor: 22.22 * 1.10 = 24.44 cu yd (or 24.4 cu yd).

About the Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Exam

The Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination is the combined trade assessment administered by PSI Services LLC for candidates seeking licensure under four primary contractor classifications in Arizona: B-1 General Commercial Contractor, B-2 General Small Commercial Contractor, KB-1 Dual Building Contractor, and KB-2 Dual Residential and Commercial Contractor. The examination consists of 100 computer-delivered, open-book multiple-choice questions with a 240-minute (4-hour) time limit and a required passing threshold of 70% (70 correct answers). Test items evaluate technical proficiency across sitework, excavation, structural concrete, reinforced masonry, structural steel and cold-formed metals, rough and finish carpentry, thermal and moisture protection, doors and windows, interior finishes, OSHA construction safety regulations (29 CFR 1926), and International Building Code (IBC) / International Residential Code (IRC) compliance. Candidates may also submit passing scores from the NASCLA Accredited Examination for Commercial General Building Contractors in lieu of taking this trade examination. Note: Local practice questions serve as an English-language MCQ study adaptation and do not replace official code references, board approval, or hands-on trade experience.

Questions

100 scored questions

Time Limit

240 minutes

Passing Score

70%

Exam Fee

$66 (Arizona Registrar of Contractors / PSI Services LLC)

Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Exam Content Outline

9%

Sitework

Soil classification (USCS & OSHA Type A/B/C), excavation cut/fill volume calculations, soil compaction testing (Proctor tests), site grading, slope drainage, subterranean drainage, retaining wall backfill, and load-bearing capacity of soils per IBC Chapter 18.

14%

Concrete

Concrete mix design, water-cementitious ratio, slump testing (ASTM C143), air content, volumetric calculations, curing methods (ACI 308), formwork design (ACI 347), rebar sizing/spacing/cover (ACI 318), control joint spacing, and post-tensioned slab installation.

10%

Masonry

Concrete Masonry Units (CMU) nominal vs actual sizing, mortar types per ASTM C270 (Type M, S, N, O), grouting lifts/slump (ASTM C476), vertical/horizontal reinforcement, bond beams, control joints, brick veneer flashing, weep holes, and cold weather masonry rules.

13%

Metals

Structural steel shapes (W, C, L, HSS), AISC bolted/welded connection specifications, AWS D1.1 structural welding, open-web steel joists (SJI K/LH/DLH series), joist bridging and stability, metal deck installation (SDI), cold-formed light-gauge steel framing (AISI), and OSHA steel erection safety (Subpart R).

12%

Carpentry

Lumber grading, structural engineered wood (LVL, Glulam, I-joists), floor/wall/roof rough framing layout, header sizing, load-bearing wood stud walls, prefabricated roof truss installation/bracing (ANSI/TPI 1), structural panel sheathing (plywood/OSB), APA span ratings, and fastener schedules per IBC Chapter 23 / IRC Chapter 6.

10%

Thermal and Moisture Protection

Thermal insulation types and R-value/U-factor calculations (IECC), vapor retarders, air barriers, steep and low-slope roofing systems (BUR, modified bitumen, TPO/EPDM single-ply, asphalt shingles, tile per NRCA), flashing details (SMACNA), stucco 3-coat plaster systems, and foundation waterproofing/dampproofing per IBC Chapter 18.

5%

Doors and Windows

Fire-rated door assemblies (NFPA 80), emergency egress doors, panic hardware, clear opening dimensions, safety glazing hazardous locations (tempered/laminated per IBC Chapter 24), window pan flashing, NFRC thermal performance ratings, and storefront/curtain wall framing.

6%

Finishes

Gypsum board installation and finishing (GA-216, Levels 0-5), Type X fire-rated drywall, acoustical suspended ceiling systems (ASTM C635/C636, seismic wires), ceramic tile installation (TCNA/ANSI A108), floor moisture testing (ASTM F1869/F2170), and interior finish flame spread/smoke development index (ASTM E84).

12%

Safety

OSHA 29 CFR 1926 standards: Fall protection systems and trigger heights (Subpart M), excavation/trenching soil sloping and trench box requirements (Subpart P), scaffolding assembly and loading (Subpart L), extension/step ladder safety (Subpart X), Hazard Communication SDS (GHS), respirable crystalline silica standards (1926.1153), GFCI temporary power protection (Subpart K), and crane clearance/rigging safety (Subpart CC).

9%

General Building Code

IBC Chapter 3 occupancy classifications (Assembly, Business, Educational, Factory, Hazardous, Institutional, Mercantile, Residential, Storage), Chapter 6 construction types (Types I-V), Chapter 5 height and area limitations and sprinkler increases, Chapter 10 means of egress calculations (occupant load, egress width, exit counts, exit separation distance), and ADA accessibility requirements (ICC A117.1).

How to Pass the Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 100 questions
  • Time limit: 240 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

Arizona ROC B-1/B-2/KB-1/KB-2 Residential and Commercial Building Examination Study Tips from Top Performers

1Familiarize yourself with tabbed code books (IBC, IRC, OSHA 1926, ACI 318, AISC) to rapidly look up formula constants, table values, and dimensional clearances during the 240-minute exam.
2Practice structural calculations, including concrete slab volume in cubic yards, CMU unit counts per wall area, rebar lap splice lengths, and rafter/joist span table lookups.
3Memorize key OSHA 1926 safety thresholds: 6 ft fall protection trigger height (15 ft steel erection, 10 ft scaffolds), 5 ft excavation sloping/shoring threshold, 2 ft spoil pile setback, and 25 ft ladder travel distance.
4Master IBC egress calculations: occupant load factors (150 sq ft business, 7 sq ft concentrated assembly, 60 sq ft mercantile), 0.2-inch per occupant door width factor, and 1/2 diagonal exit separation rule.
5Review mix proportions and ASTM standards for concrete slump (C143), mortar types (M, S, N, O per ASTM C270), and silica exposure limits (50 ug/m3 TWA).

Frequently Asked Questions

Which contractor licenses in Arizona are covered by this single trade exam?

This single combined exam covers four Arizona Registrar of Contractors (AZ ROC) building license classifications: B-1 General Commercial Contractor, B-2 General Small Commercial Contractor, KB-1 Dual Building Contractor, and KB-2 Dual Residential and Commercial Contractor.

What is the format, time limit, and passing score of the AZ ROC B-1/B-2/KB-1/KB-2 exam?

The exam is a computer-delivered, open-book test administered by PSI Services LLC. It consists of 100 multiple-choice questions. Candidates are given 240 minutes (4 hours) to complete the exam, and a score of 70% or higher (70 correct out of 100) is required to pass.

Is the NASCLA Commercial General Building Exam accepted in lieu of this trade exam?

Yes. Arizona ROC accepts a passing score on the NASCLA Accredited Examination for Commercial General Building Contractors in lieu of taking the AZ ROC B-1/B-2/KB-1/KB-2 trade examination.

Can I bring code books into the PSI testing center?

Yes. The exam is open-book. Candidates may bring approved bound reference books (such as the IBC, IRC, OSHA 1926, ACI standards, and trade reference manuals) into the PSI testing center, provided they are permanently bound and marked according to PSI guidelines (tabs must be permanent index tabs, no loose notes).

Do candidates still need to pass the Arizona Statutes and Rules exam?

Yes. In addition to passing this trade examination (or holding an approved NASCLA waiver), candidates must pass the Arizona Management and Business Exam (Solar / Business Law SMM exam) and fulfill all ROC licensure experience and background check criteria.