IICRC WRT 2026/ 2027 Test Questions
with Accurate Solutions |Verified
1. When pre-existing damage is discovered, the restorer should:
A. Ignore it if unrelated to the loss
B. Repair it immediately
C. Photograph it only
D. Document and bring it to the attention of materially interested parties
Correct Answer: D
Pre-existing damage must be clearly documented to protect all parties from disputes.
Notifying materially interested parties ensures transparency. This practice reduces
liability and aligns with professional standards. It also helps separate the current loss
from previous conditions.
2. Rapid drying of structural materials is achieved by:
A. Promoting evaporation and dehumidification or ventilation
B. Increasing heat only
C. Removing air movers after 24 hours
D. Sealing the structure completely
Correct Answer: A
Rapid drying depends on increasing evaporation at the material surface and removing
moisture from the air. Dehumidification or ventilation lowers ambient moisture levels.
Air movement supports evaporation but must be paired with moisture removal. Using
only heat is ineffective without moisture control.
3. When carpet and cushion are saturated with Category 3 water:
A. They may be cleaned and dried
B. Both should be removed for proper disposal
C. Only the cushion must be removed
D. Dry in place with antimicrobial treatment
Correct Answer: B
Category 3 water is grossly contaminated and poses health risks. Porous materials like
carpet and cushion cannot be effectively sanitized. Industry standards require removal
and disposal. This protects occupant health and prevents secondary contamination.
4. To minimize safety concerns and speed structural drying, saturated and sagging
drywall ceilings should be:
,A. Drained, removed quickly, and properly disposed
B. Left in place to dry naturally
C. Reinforced and dried
D. Covered with plastic
Correct Answer: A
Sagging drywall ceilings pose a collapse hazard. Removing them quickly improves safety
and allows access to wet cavities. Proper disposal prevents contamination spread. This
approach also accelerates the drying process.
5. The force exerted by water vapor molecules in the air on surrounding surfaces is
called:
A. Relative humidity
B. Vapor pressure
C. Humidity ratio
D. Dew point
Correct Answer: B
Vapor pressure represents the energy of water vapor in the air. It drives moisture
movement from areas of high pressure to low pressure. Understanding vapor pressure is
essential to controlling evaporation. It is a key psychrometric concept.
6. The fastest rate of evaporation from materials at 70°F occurs in an environment
with:
A. 60°F and 80% RH
B. 80°F and 80% RH
C. 70°F and 100% RH
D. 90°F and 90% RH
Correct Answer: A
Evaporation increases when the vapor pressure of air is lower than that of the material.
Cooler air with moderate humidity can have lower vapor pressure. This creates a
stronger drying gradient. High humidity environments slow evaporation.
7. Two hazardous materials commonly found in older buildings are:
A. Mold and bacteria
B. Mercury and radon
C. Lead-based paint and asbestos
D. Fiberglass and cellulose
Correct Answer: C
Older buildings may contain lead-based paint and asbestos-containing materials. These
substances are regulated due to serious health risks. Handling them requires compliance
,with laws and regulations. Proper identification is essential before restoration work
begins.
8. As humidity ratio increases, which other psychrometric property also increases?
A. Temperature
B. Specific volume
C. Vapor pressure
D. Dew point depression
Correct Answer: C
Humidity ratio and vapor pressure are directly related. As more moisture is added to the
air, vapor pressure rises. This affects evaporation rates during drying. Monitoring both
values helps restorers adjust drying strategies.
9. Ventilating a structure during early restoration can enhance drying by reducing:
A. Temperature
B. Air movement
C. Humidity buildup
D. Material density
Correct Answer: C
Ventilation removes moist air and replaces it with drier air. This reduces indoor humidity
levels. Lower humidity increases evaporation potential. Ventilation is especially effective
when outdoor air has a lower humidity ratio.
10. When using a government-registered biocide, restorers shall:
A. Apply at double strength
B. Use at their discretion
C. Apply according to label directions
D. Mix with detergents
Correct Answer: C
Biocide labels are legal documents. Applying them incorrectly violates federal
regulations. Following label directions ensures effectiveness and safety. This protects
occupants, workers, and the restorer.
11. The primary goal of water damage restoration is to:
A. Restore materials to pre-loss moisture condition
B. Eliminate all microorganisms
C. Replace all wet materials
D. Complete drying within 24 hours
Correct Answer: A
The main objective of restoration is returning materials to their normal moisture levels.
, This prevents secondary damage such as mold growth. Eliminating all microorganisms is
unrealistic. Timeframes vary depending on conditions.
12. Which category of water originates from clean sources but may become
contaminated?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Correct Answer: B
Category 2 water contains significant contamination and can cause illness. It may
originate from appliances or overflows. It can degrade into Category 3 if not treated
promptly. Special handling is required.
13. Hygroscopic materials are defined as materials that:
A. Repel moisture
B. Absorb and retain moisture from air
C. Are waterproof
D. Dry instantly
Correct Answer: B
Hygroscopic materials absorb moisture from surrounding air. Examples include wood
and drywall. These materials require controlled drying. Improper drying can lead to
swelling or warping.
14. The term “equilibrium moisture content” refers to:
A. Maximum moisture capacity
B. Moisture level at which material is stable
C. Dry standard for all materials
D. Saturation point
Correct Answer: B
Equilibrium moisture content (EMC) occurs when a material is neither gaining nor losing
moisture. EMC depends on ambient temperature and humidity. Drying goals are based
on returning materials to EMC. Measuring this ensures proper drying.
15. Which instrument is used to measure ambient relative humidity?
A. Thermometer
B. Hygrometer
C. Anemometer
D. Moisture probe
Correct Answer: B
A hygrometer measures relative humidity in the air. Accurate humidity readings are vital
with Accurate Solutions |Verified
1. When pre-existing damage is discovered, the restorer should:
A. Ignore it if unrelated to the loss
B. Repair it immediately
C. Photograph it only
D. Document and bring it to the attention of materially interested parties
Correct Answer: D
Pre-existing damage must be clearly documented to protect all parties from disputes.
Notifying materially interested parties ensures transparency. This practice reduces
liability and aligns with professional standards. It also helps separate the current loss
from previous conditions.
2. Rapid drying of structural materials is achieved by:
A. Promoting evaporation and dehumidification or ventilation
B. Increasing heat only
C. Removing air movers after 24 hours
D. Sealing the structure completely
Correct Answer: A
Rapid drying depends on increasing evaporation at the material surface and removing
moisture from the air. Dehumidification or ventilation lowers ambient moisture levels.
Air movement supports evaporation but must be paired with moisture removal. Using
only heat is ineffective without moisture control.
3. When carpet and cushion are saturated with Category 3 water:
A. They may be cleaned and dried
B. Both should be removed for proper disposal
C. Only the cushion must be removed
D. Dry in place with antimicrobial treatment
Correct Answer: B
Category 3 water is grossly contaminated and poses health risks. Porous materials like
carpet and cushion cannot be effectively sanitized. Industry standards require removal
and disposal. This protects occupant health and prevents secondary contamination.
4. To minimize safety concerns and speed structural drying, saturated and sagging
drywall ceilings should be:
,A. Drained, removed quickly, and properly disposed
B. Left in place to dry naturally
C. Reinforced and dried
D. Covered with plastic
Correct Answer: A
Sagging drywall ceilings pose a collapse hazard. Removing them quickly improves safety
and allows access to wet cavities. Proper disposal prevents contamination spread. This
approach also accelerates the drying process.
5. The force exerted by water vapor molecules in the air on surrounding surfaces is
called:
A. Relative humidity
B. Vapor pressure
C. Humidity ratio
D. Dew point
Correct Answer: B
Vapor pressure represents the energy of water vapor in the air. It drives moisture
movement from areas of high pressure to low pressure. Understanding vapor pressure is
essential to controlling evaporation. It is a key psychrometric concept.
6. The fastest rate of evaporation from materials at 70°F occurs in an environment
with:
A. 60°F and 80% RH
B. 80°F and 80% RH
C. 70°F and 100% RH
D. 90°F and 90% RH
Correct Answer: A
Evaporation increases when the vapor pressure of air is lower than that of the material.
Cooler air with moderate humidity can have lower vapor pressure. This creates a
stronger drying gradient. High humidity environments slow evaporation.
7. Two hazardous materials commonly found in older buildings are:
A. Mold and bacteria
B. Mercury and radon
C. Lead-based paint and asbestos
D. Fiberglass and cellulose
Correct Answer: C
Older buildings may contain lead-based paint and asbestos-containing materials. These
substances are regulated due to serious health risks. Handling them requires compliance
,with laws and regulations. Proper identification is essential before restoration work
begins.
8. As humidity ratio increases, which other psychrometric property also increases?
A. Temperature
B. Specific volume
C. Vapor pressure
D. Dew point depression
Correct Answer: C
Humidity ratio and vapor pressure are directly related. As more moisture is added to the
air, vapor pressure rises. This affects evaporation rates during drying. Monitoring both
values helps restorers adjust drying strategies.
9. Ventilating a structure during early restoration can enhance drying by reducing:
A. Temperature
B. Air movement
C. Humidity buildup
D. Material density
Correct Answer: C
Ventilation removes moist air and replaces it with drier air. This reduces indoor humidity
levels. Lower humidity increases evaporation potential. Ventilation is especially effective
when outdoor air has a lower humidity ratio.
10. When using a government-registered biocide, restorers shall:
A. Apply at double strength
B. Use at their discretion
C. Apply according to label directions
D. Mix with detergents
Correct Answer: C
Biocide labels are legal documents. Applying them incorrectly violates federal
regulations. Following label directions ensures effectiveness and safety. This protects
occupants, workers, and the restorer.
11. The primary goal of water damage restoration is to:
A. Restore materials to pre-loss moisture condition
B. Eliminate all microorganisms
C. Replace all wet materials
D. Complete drying within 24 hours
Correct Answer: A
The main objective of restoration is returning materials to their normal moisture levels.
, This prevents secondary damage such as mold growth. Eliminating all microorganisms is
unrealistic. Timeframes vary depending on conditions.
12. Which category of water originates from clean sources but may become
contaminated?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Correct Answer: B
Category 2 water contains significant contamination and can cause illness. It may
originate from appliances or overflows. It can degrade into Category 3 if not treated
promptly. Special handling is required.
13. Hygroscopic materials are defined as materials that:
A. Repel moisture
B. Absorb and retain moisture from air
C. Are waterproof
D. Dry instantly
Correct Answer: B
Hygroscopic materials absorb moisture from surrounding air. Examples include wood
and drywall. These materials require controlled drying. Improper drying can lead to
swelling or warping.
14. The term “equilibrium moisture content” refers to:
A. Maximum moisture capacity
B. Moisture level at which material is stable
C. Dry standard for all materials
D. Saturation point
Correct Answer: B
Equilibrium moisture content (EMC) occurs when a material is neither gaining nor losing
moisture. EMC depends on ambient temperature and humidity. Drying goals are based
on returning materials to EMC. Measuring this ensures proper drying.
15. Which instrument is used to measure ambient relative humidity?
A. Thermometer
B. Hygrometer
C. Anemometer
D. Moisture probe
Correct Answer: B
A hygrometer measures relative humidity in the air. Accurate humidity readings are vital
