100+ Free CMI Practice Questions

Pass your Certified Master Inspector (CMI) exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

Not publicly disclosed Pass Rate

100+ Questions

100% Free

1 / 10

Question 1

Score: 0/0

According to NFPA 211, what is the minimum clearance required between a factory-built fireplace chimney and combustible framing members?

2 inches on all sides

1 inch on all sides

3 inches at the top, 0 inches at the sides

No clearance required if the chimney is listed

to track

2026 Statistics

Key Facts: CMI Exam

1,000+

Paid Inspections Required

MICB CMI Criteria

4.0 pCi/L

EPA Radon Action Level

U.S. EPA

NEC 110.26

Panel Clearance Code

NFPA/NEC

6 in / 10 ft

Foundation Drainage Slope

IRC R401.3

UL 2218

Hail Impact Rating Standard

UL / NRCA

100 Qs

Practice Questions

OpenExamPrep

The Certified Master Inspector (CMI) credential from the Master Inspector Certification Board (certificationboard.org) is the premier advanced home inspection certification. Eligibility requires a minimum of 1,000 fee-paid inspections and/or a combination of inspections and approved CE hours. The CMI exam tests expert-level knowledge across all major residential systems: roofing (UL 2218 impact ratings, hail damage, flashing failures), structure (post-tension slabs, expansive soils, seismic detailing, sill plate anchor bolts), electrical (NEC 250 grounding/bonding, NEC 110.26 panel clearance, CAFCI/DFCI, gas piping bonding, 2020 NEC SPD requirements), HVAC (Manual J/D/S sizing, heat pump HSPF/COP, ductless mini-splits, NFPA 54/IFGC combustion air), plumbing (thermal expansion tanks, trap primers, backflow prevention), insulation (spray foam open vs. closed cell, ignition barriers, IECC climate zones), ventilation (IMC CFM requirements, ERV vs. HRV), fireplace/chimney (NFPA 211, liner integrity), and environmental hazards (radon EPA 4.0 pCi/L, asbestos ACM, lead-based paint RRP, mold).

Sample CMI Practice Questions

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

1According to NFPA 211, what is the minimum clearance required between a factory-built fireplace chimney and combustible framing members?

A.2 inches on all sides

B.1 inch on all sides

C.3 inches at the top, 0 inches at the sides

D.No clearance required if the chimney is listed

Explanation: NFPA 211 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances requires a minimum 2-inch clearance between factory-built chimney systems and combustible framing. This clearance must be maintained through all framing penetrations, including the ceiling/attic space, and is typically enforced by the chimney's listed firestop spacer. A master inspector must verify that remodeling or additions have not compressed this clearance.

2A CMI inspector observes a masonry chimney with a clay tile flue liner that has multiple cracks and mortar joint spalling. What is the primary life-safety concern?

A.Combustion gases including carbon monoxide can migrate into the living space through liner defects

B.Reduced draw and slower fire start-up

C.Increased creosote accumulation on the exterior

D.Thermal bridging and heat loss through the chimney wall

Explanation: Cracked or deteriorated clay tile flue liners allow combustion byproducts — including carbon monoxide, a colorless, odorless, potentially lethal gas — to migrate through the liner defects into the chimney wall void and ultimately into adjacent living spaces. NFPA 211 mandates liner integrity for this reason. A CMI must recommend full liner assessment (camera inspection) and typically relining when structural liner defects are identified.

3The EPA action level for radon in indoor air is 4.0 pCi/L. A post-mitigation test result shows 3.8 pCi/L. What should the CMI communicate to the client?

A.The result is below the EPA action level but still above the EPA-recommended goal of 2.0 pCi/L; further reduction may be warranted

B.The mitigation system succeeded fully; no further action is needed at any future date

C.The result is dangerously high and the home is uninhabitable

D.Post-mitigation testing is only valid if conducted during heating season

Explanation: The EPA action level is 4.0 pCi/L, but the EPA also recommends considering mitigation when levels are between 2.0 and 4.0 pCi/L, and aims for levels below 2.0 pCi/L where achievable. At 3.8 pCi/L, the home is technically below the action level but still in the range where the EPA recommends consideration of mitigation improvement. A CMI should accurately communicate both thresholds and advise periodic re-testing.

4When inspecting an electrical service panel, NEC 110.26 requires a minimum working space in front of the panel of:

A.30 inches wide, 3 feet deep, and 6 feet 6 inches high

B.24 inches wide, 2 feet deep, and 6 feet high

C.36 inches wide, 3 feet deep, and 6 feet high

D.18 inches wide, 3 feet deep, and 6 feet 6 inches high

Explanation: NEC 110.26 specifies that working space in front of electrical equipment (including panels) must be at least 30 inches wide (or the width of the equipment, whichever is greater), 3 feet (36 inches) deep (Condition 1), and 6 feet 6 inches high. This clear working space must be maintained and must not be used for storage. A CMI verifying panel access must flag any obstruction of this required working space.

5A CMI observes that the gas piping inside a residence is not bonded to the electrical grounding system. According to NEC 250.104(B), this is a deficiency because:

A.Interior metal gas piping can reach a dangerous voltage potential in a fault condition without bonding, creating an electrocution risk

B.Gas piping must be bonded to prevent static discharge from the gas flow

C.Bonding equalizes gas pressure throughout the distribution system

D.NEC 250.104(B) only applies to exterior gas piping, so interior piping has no bonding requirement

Explanation: NEC 250.104(B) requires that exposed metal gas piping be bonded to the electrical grounding electrode system. In a fault condition — such as when a line-to-neutral or line-to-ground fault energizes piping — unbonded metal gas piping can reach a dangerous potential difference relative to grounded equipment or earth. Bonding eliminates this voltage differential, preventing electrocution from contact with the gas pipe. A CMI should flag missing gas piping bonding jumpers.

6A CMI inspects a 2,200 sq ft two-story home built in 1975. Popcorn ceiling texture in the master bedroom tests positive for asbestos at 3% chrysotile by weight. What is the appropriate recommendation?

A.Recommend evaluation and remediation by a licensed asbestos abatement contractor; do not disturb the material

B.Advise the client to scrape and repaint immediately to encapsulate the fibers

C.No action is needed because asbestos below 5% is considered friable but non-hazardous

D.Recommend a second test in 6 months before taking any action

Explanation: Any confirmed asbestos-containing material (ACM) that is friable or subject to disturbance — such as popcorn texture that can be crumbled by hand pressure — requires evaluation by a licensed asbestos abatement professional. The EPA defines ACM as material containing more than 1% asbestos by weight. At 3%, this ceiling texture is ACM and should not be disturbed without proper containment and abatement procedures. The CMI's role is to identify, note the finding, and defer to a licensed specialist.

7A post-tension concrete slab home shows cracking that is wider at the slab edge and narrows toward the center. What does this pattern most likely indicate?

A.Edge lift caused by differential soil moisture — the slab perimeter has risen relative to the interior due to moisture accumulation at the edges

B.Center lift caused by expansive soil heaving beneath the center of the slab

C.Settlement of interior footings in sandy soil

D.Shrinkage cracks from inadequate curing during initial placement

Explanation: In post-tension (PT) slab construction on expansive clay soils, edge lift occurs when the perimeter of the slab rises due to moisture increase along the edges — typically from irrigation, drainage, or landscaping. Cracks wider at the exterior edge and tapering inward are a diagnostic sign of edge lift. A CMI should note this pattern, assess the drainage and irrigation around the perimeter, and recommend evaluation by a structural engineer familiar with PT slabs.

8NEC Article 250 requires service entrance grounding and bonding. Which of the following is the MOST complete description of a properly grounded and bonded service?

A.The neutral conductor is bonded to the service enclosure and grounded at the service panel via a grounding electrode conductor connected to the grounding electrode system

B.A ground rod is driven at the meter base; no further connection to the neutral is required

C.The grounding electrode conductor connects the panel equipment grounding bus directly to the water main only

D.Bonding is only required at the service disconnect, not at subpanels

Explanation: Per NEC 250, the service neutral (grounded conductor) must be bonded to the service enclosure (main bonding jumper) and connected via a grounding electrode conductor (GEC) to the grounding electrode system — which includes ground rods, metal water pipe, concrete-encased electrode (Ufer), and other available electrodes. This single-point neutral-to-ground bond at the service creates the fault current path required for overcurrent device operation. At subpanels, the neutral must be isolated from the equipment grounding bus (unbonded).

9A CMI is inspecting the HVAC system and notes that the installed equipment is significantly oversized relative to what a Manual J load calculation would indicate. What is the MOST likely consequence of oversized HVAC equipment?

A.Short cycling, poor dehumidification, uneven temperatures, and accelerated equipment wear

B.Lower utility bills due to reduced run time

C.Better air distribution throughout the home

D.Faster recovery from large temperature swings

Explanation: Oversized HVAC equipment — sized without a Manual J load calculation — short cycles: it rapidly brings the space to setpoint and shuts off before completing a full refrigeration cycle. Short cycling prevents adequate dehumidification (dehumidification occurs mainly in the second half of each cooling cycle), creates hot and cold spots due to inadequate air mixing, and causes excessive compressor start-stop stress, reducing equipment life. ACCA Manual J/D/S is the industry standard for properly sizing residential HVAC.

10A heat pump has a Heating Seasonal Performance Factor (HSPF) rating. What does a higher HSPF value indicate?

A.Greater heating efficiency — more BTUs of heat delivered per watt-hour of electrical energy consumed over the heating season

B.Higher capacity to heat in very cold climates below 0°F

C.Faster defrost cycle completion

D.Better Coefficient of Performance (COP) specifically at peak summer cooling conditions

Explanation: HSPF (Heating Seasonal Performance Factor) measures the ratio of total BTUs of heat delivered to total watt-hours of electrical energy consumed over a heating season. A higher HSPF means the system delivers more heat per unit of electricity — it is a seasonal efficiency metric. Minimum federal HSPF requirements are 8.8 for split systems in most climates (HSPF2 7.5 under the updated DOE test protocol effective 2023). A CMI should note equipment efficiency ratings when equipment documentation is available.

About the CMI Exam

The CMI (Certified Master Inspector) is the highest-level residential home inspection credential, awarded by the Master Inspector Certification Board to inspectors who have completed 1,000+ paid inspections and rigorous continuing education. Pass with 100 expert-level practice questions.

Questions

200 scored questions

Time Limit

Computer-based exam — duration varies by MICB

Passing Score

Not publicly disclosed

Exam Fee

Contact MICB at certificationboard.org (Master Inspector Certification Board (MICB))

CMI Exam Content Outline

20%

Roofing Systems

All roofing types, flashing failures, hail damage patterns, UL 2218 impact ratings, valley types, underlayment standards, low-slope systems, NRCA standards

18%

Structural Systems

Foundation types (post-tension slab, stem wall), expansive soil, seismic detailing, sill plate anchor bolts, cripple wall retrofits, beam deflection, wood decay

18%

Electrical Systems

NEC 250 grounding/bonding, NEC 110.26 panel clearance, CAFCI/DFCI, gas piping bonding, SPD (2020 NEC 230.67), service entrance, aluminum wiring, panel defects

15%

HVAC Systems

Manual J/D/S load calculations, heat pump COP/HSPF, ductless mini-splits, zoned systems, combustion air (NFPA 54/IFGC), duct leakage, heat exchanger integrity

10%

Plumbing Systems

Thermal expansion tanks on closed systems, trap primers, backflow prevention (RPZ/PVB), T&P relief valves, polybutylene pipe, galvanized pipe, gas connectors

10%

Insulation & Ventilation

Spray foam (open vs. closed cell), ignition barriers, IECC climate zone R-values, blown-in insulation, attic ventilation, bathroom exhaust (IMC CFM), ERV vs. HRV

Environmental Hazards

Radon (EPA 4.0 pCi/L action level), asbestos ACM identification, lead-based paint RRP Rule, mold assessment scope, vermiculite (Zonolite)

Professional Standards

CMI Code of Ethics, Standards of Practice, inspector scope and liability, reporting obligations, referral protocols for specialists

How to Pass the CMI Exam

What You Need to Know

Passing score: Not publicly disclosed
Exam length: 200 questions
Time limit: Computer-based exam — duration varies by MICB
Exam fee: Contact MICB at certificationboard.org

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CMI Study Tips from Top Performers

1Master NEC 250 grounding and bonding — know the difference between grounding (fault-current path) and bonding (voltage equalization), and where each applies

2Memorize the EPA radon threshold: action level 4.0 pCi/L, consideration level 2.0–4.0 pCi/L, target below 2.0 pCi/L

3Know NFPA 211 chimney requirements: flue liner integrity, 2-inch clearance to combustibles, crown construction

4Understand Manual J/D/S as a system: J = loads, D = duct design, S = equipment selection — know what each determines and why oversizing is harmful

5Commit IRC R401.3 grade slope to memory: 6 inches in first 10 feet — the most-tested exterior drainage requirement

6Know the difference between open-cell and closed-cell SPF: closed-cell is denser, higher R/inch, acts as vapor retarder, and is required for unvented roof assemblies

7Study NEC 110.26 panel clearance: 30 inches wide, 36 inches deep, 6 ft 6 in high — all three dimensions must be met independently

Frequently Asked Questions

What is the Certified Master Inspector (CMI) credential?

The Certified Master Inspector (CMI) is the highest-level home inspection certification, awarded by the Master Inspector Certification Board (MICB) at certificationboard.org. To earn the CMI, inspectors must complete a minimum of 1,000 fee-paid home inspections and/or a combination of inspections and approved continuing education hours, pass an examination, and comply with the CMI Code of Ethics. The CMI designation signals expert-level mastery of all residential building systems.

What topics are covered on the CMI exam?

The CMI exam covers all major residential building systems at an expert level: roofing (all types, hail damage, UL 2218 impact ratings, flashing details), structure (post-tension slabs, expansive soils, seismic detailing, sill plate anchor bolts), electrical (NEC 250 grounding/bonding, panel clearance NEC 110.26, CAFCI, aluminum wiring, SPD), HVAC (Manual J/D/S sizing, heat pump HSPF/COP, ductless mini-splits, combustion air per NFPA 54/IFGC), plumbing (thermal expansion tanks, backflow prevention, trap primers), insulation (spray foam, IECC climate zones, ignition barriers), ventilation (IMC CFM requirements, ERV/HRV), fireplace/chimney (NFPA 211, liner integrity), and environmental hazards (radon, asbestos, lead, mold).

How do I qualify for the CMI certification?

CMI eligibility requires completing a minimum of 1,000 fee-paid home inspections and/or a combination of fee-paid inspections and approved continuing education hours as outlined in the MICB candidate handbook at certificationboard.org. You must also agree to the CMI Code of Ethics and submit a completed application with supporting documentation. Contact MICB directly for current eligibility requirements and application procedures.

How does the CMI differ from regular home inspection certifications?

The CMI designation is distinguished from entry-level certifications (such as ASHI Member, InterNACHI Certified Professional Inspector, or state licensing) by its experience requirements (1,000+ paid inspections), its expert-level exam content spanning advanced code knowledge (NEC, IRC, NFPA), specialized systems (post-tension slabs, ductless mini-splits, solar PV), and environmental hazards assessment. CMIs are recognized as industry experts who can handle complex inspection scenarios, expert witness testimony, and specialized property types.

What is the EPA radon action level?

The EPA recommends taking action to reduce indoor radon levels when concentrations reach 4.0 pCi/L (picocuries per liter). The EPA also recommends considering mitigation for levels between 2.0 and 4.0 pCi/L and aims for levels below 2.0 pCi/L where achievable. A CMI performing or overseeing radon testing should understand both the action level (4.0 pCi/L) and the lower target goal (2.0 pCi/L) and communicate both thresholds accurately to clients.

What does NEC 110.26 require for electrical panel clearance?

NEC 110.26 requires a minimum working space in front of electrical panels of 30 inches wide (or the width of the equipment, whichever is greater), 36 inches deep (Condition 1), and 6 feet 6 inches high. This working space must be kept clear and cannot be used for storage. A CMI must verify these dimensions during an inspection and flag any obstruction or shortfall as a deficiency.

What is the minimum drainage slope away from a foundation per IRC?

IRC R401.3 requires that the finished grade slope away from the foundation at a minimum of 6 inches of fall within the first 10 feet from the foundation. This positive drainage slope directs surface water away from the perimeter, reducing hydrostatic pressure and moisture intrusion into basements and crawlspaces. A CMI should always verify and document the actual grade slope during exterior inspection.