IICRC WRT 100-Question Real Practice Exam Latest
2026/2027 | Verified Answers | PDF
1. Which document establishes the standard of care for water damage restoration?
A. OSHA 1910
B. IICRC S500
C. EPA 608
D. ASTM E1333
Rationale: The IICRC S500 is the recognized industry standard outlining
principles, methods, and processes for professional water damage restoration.
2. Water from a broken supply line is considered what category?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Rationale: Category 1 water is “clean water” from a sanitary source, such as a
supply line or faucet.
3. Category 3 water is best described as:
A. Water with minor contamination
B. Clean water from a supply line
C. Grossly contaminated water containing pathogens
D. Rainwater entering through a roof leak
Rationale: Category 3 water includes sewage, floodwater, or any water containing
hazardous contaminants.
,4. Class 1 water loss refers to:
A. The least amount of water absorption and evaporation load
B. Moderate absorption into materials
C. Extensive saturation of building materials
D. Deep saturation into subfloors and walls
Rationale: Class 1 = minimal water absorption, small area, and low evaporation
load.
5. What instrument measures the moisture content of building materials?
A. Thermo-hygrometer
B. Moisture meter
C. Manometer
D. Psychrometer
Rationale: Moisture meters measure how much water is present in solid materials
such as drywall or wood.
6. What does psychrometry study?
A. The relationship between air, humidity, and temperature
B. Bacterial contamination
C. Chemical reactions
D. Electrical safety
Rationale: Psychrometry is the science of air and water vapor relationships—
critical for drying.
7. The drying goal is achieved when:
A. The structure “feels dry”
B. The air is at 50% RH
,C. Materials reach dry standard or equilibrium moisture content (EMC)
D. Equipment runs for 3 days
Rationale: Drying is complete when materials reach the target (dry standard)
verified by readings.
8. The first step in water damage restoration is:
A. Inspection and safety assessment
B. Applying antimicrobial
C. Removing carpet
D. Setting dehumidifiers
Rationale: Safety and initial inspection are always the first step before mitigation.
9. Which device measures temperature and relative humidity?
A. Moisture meter
B. Thermo-hygrometer
C. Manometer
D. Hygrostat
Rationale: A thermo-hygrometer combines temperature and humidity sensors—
used to calculate GPP and vapor pressure.
10. Which principle comes first in water damage restoration?
A. Safety
B. Drying
C. Cleaning
D. Deodorization
Rationale: Worker and occupant safety always come before any restoration
activity.
, 11. Dehumidifiers reduce which of the following?
A. Temperature
B. Humidity ratio (grains per pound of moisture)
C. Air velocity
D. Vapor pressure differential
Rationale: Dehumidifiers remove moisture from air, lowering humidity ratio
(GPP).
12. What type of dehumidifier works best at lower temperatures?
A. LGR (Low-Grain Refrigerant)
B. Conventional refrigerant
C. Desiccant dehumidifier
D. Portable A/C
Rationale: Desiccants use chemical adsorption and perform efficiently in cool, dry
conditions.
13. When should a restorer remove pad under carpet?
A. When affected by Category 2 or 3 water
B. Only if wet more than 12 hours
C. Always
D. Never
Rationale: Pad exposed to contaminated water should be removed due to health
risks.
14. Air movers should be placed to create:
A. Random airflow
2026/2027 | Verified Answers | PDF
1. Which document establishes the standard of care for water damage restoration?
A. OSHA 1910
B. IICRC S500
C. EPA 608
D. ASTM E1333
Rationale: The IICRC S500 is the recognized industry standard outlining
principles, methods, and processes for professional water damage restoration.
2. Water from a broken supply line is considered what category?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Rationale: Category 1 water is “clean water” from a sanitary source, such as a
supply line or faucet.
3. Category 3 water is best described as:
A. Water with minor contamination
B. Clean water from a supply line
C. Grossly contaminated water containing pathogens
D. Rainwater entering through a roof leak
Rationale: Category 3 water includes sewage, floodwater, or any water containing
hazardous contaminants.
,4. Class 1 water loss refers to:
A. The least amount of water absorption and evaporation load
B. Moderate absorption into materials
C. Extensive saturation of building materials
D. Deep saturation into subfloors and walls
Rationale: Class 1 = minimal water absorption, small area, and low evaporation
load.
5. What instrument measures the moisture content of building materials?
A. Thermo-hygrometer
B. Moisture meter
C. Manometer
D. Psychrometer
Rationale: Moisture meters measure how much water is present in solid materials
such as drywall or wood.
6. What does psychrometry study?
A. The relationship between air, humidity, and temperature
B. Bacterial contamination
C. Chemical reactions
D. Electrical safety
Rationale: Psychrometry is the science of air and water vapor relationships—
critical for drying.
7. The drying goal is achieved when:
A. The structure “feels dry”
B. The air is at 50% RH
,C. Materials reach dry standard or equilibrium moisture content (EMC)
D. Equipment runs for 3 days
Rationale: Drying is complete when materials reach the target (dry standard)
verified by readings.
8. The first step in water damage restoration is:
A. Inspection and safety assessment
B. Applying antimicrobial
C. Removing carpet
D. Setting dehumidifiers
Rationale: Safety and initial inspection are always the first step before mitigation.
9. Which device measures temperature and relative humidity?
A. Moisture meter
B. Thermo-hygrometer
C. Manometer
D. Hygrostat
Rationale: A thermo-hygrometer combines temperature and humidity sensors—
used to calculate GPP and vapor pressure.
10. Which principle comes first in water damage restoration?
A. Safety
B. Drying
C. Cleaning
D. Deodorization
Rationale: Worker and occupant safety always come before any restoration
activity.
, 11. Dehumidifiers reduce which of the following?
A. Temperature
B. Humidity ratio (grains per pound of moisture)
C. Air velocity
D. Vapor pressure differential
Rationale: Dehumidifiers remove moisture from air, lowering humidity ratio
(GPP).
12. What type of dehumidifier works best at lower temperatures?
A. LGR (Low-Grain Refrigerant)
B. Conventional refrigerant
C. Desiccant dehumidifier
D. Portable A/C
Rationale: Desiccants use chemical adsorption and perform efficiently in cool, dry
conditions.
13. When should a restorer remove pad under carpet?
A. When affected by Category 2 or 3 water
B. Only if wet more than 12 hours
C. Always
D. Never
Rationale: Pad exposed to contaminated water should be removed due to health
risks.
14. Air movers should be placed to create:
A. Random airflow
