IICRC WRT EXAM: (LATEST 2026–2027
UPDATE) WITH CORRECT/ACCURATE
ANSWERS
Water damage restoration technician certification offered by the
institute of inspection, cleaning and restoration certification
(iicrc)
PART 1 — QUESTIONS 1–20
1. When pre-existing damage is discovered during restoration, what should the restorer
do?
A. Ignore it if unrelated to the loss
B. Repair it at no cost
C. Photograph it but take no further action
D. Document and bring it to the attention of materially interested parties
✅ Correct Answer: D
Rationale:
The IICRC S500 requires restorers to document pre-existing damage and notify all materially interested
parties to prevent disputes and liability. Ignoring or repairing without authorization may result in legal or
financial consequences.
2. Rapid drying of structural materials is primarily achieved by which method?
A. Promoting evaporation and dehumidification or ventilation
B. Increasing temperature alone
C. Applying antimicrobials
D. Removing building materials immediately
✅ Correct Answer: A
Rationale:
Drying is most effective when evaporation is promoted at the surface and moisture is removed from the air
,via dehumidification or ventilation. Temperature alone does not remove moisture without vapor pressure
differential.
3. When carpet and cushion are saturated with Category 3 water, what is the proper
action?
A. Clean and reinstall
B. Remove and dispose of both
C. Dry in place with antimicrobials
D. Replace carpet only
✅ Correct Answer: B
Rationale:
Category 3 water contains pathogenic contaminants. Porous materials like carpet and cushion cannot be
adequately cleaned and must be removed and disposed of per IICRC standards.
4. To minimize safety concerns and speed drying, saturated and sagging drywall ceilings
should be:
A. Drained, removed quickly, and properly disposed
B. Dried in place
C. Painted to seal moisture
D. Left until contents are removed
✅ Correct Answer: A
Rationale:
Sagging drywall presents a collapse hazard. Prompt draining and removal protect workers and occupants
while preventing secondary damage and microbial growth.
5. The force exerted by water molecules in the air on surrounding surfaces is called:
A. Relative humidity
B. Vapor pressure
C. Dew point
D. Humidity ratio
✅ Correct Answer: B
,Rationale:
Vapor pressure drives moisture movement. Water moves from areas of high vapor pressure to low vapor
pressure, which is the basis of structural drying science.
6. The fastest evaporation from wet materials at 70°F (21°C) occurs in which environment?
A. 60°F (4°C) and 80% RH
B. 80°F (27°C) and 80% RH
C. 70°F (21°C) and 100% RH
D. 90°F (32°C) and 90% RH
✅ Correct Answer: A
Rationale:
Lower vapor pressure in the surrounding air increases evaporation. Even though cooler, the lower vapor
pressure at 60°F/80% RH promotes faster drying than warmer, humid air.
7. Two hazardous materials commonly found in older buildings requiring regulatory
compliance are:
A. Mold and bacteria
B. Silica and fiberglass
C. Lead-based paint and asbestos
D. Carbon monoxide and ozone
✅ Correct Answer: C
Rationale:
Older buildings may contain lead-based paint and asbestos, which are regulated by federal and state laws.
Improper handling can lead to serious health risks and legal penalties.
8. As humidity ratio increases, which psychrometric property also increases?
A. Relative humidity
B. Temperature
C. Vapor pressure
D. Dew point depression
✅ Correct Answer: C
, Rationale:
Humidity ratio and vapor pressure are directly related. As the amount of water vapor in air increases, vapor
pressure rises accordingly.
9. Ventilating a structure during early restoration helps enhance drying by reducing:
A. Temperature
B. Air movement
C. Humidity buildup
D. Vapor diffusion
✅ Correct Answer: C
Rationale:
Ventilation replaces moist indoor air with drier outdoor air, lowering humidity and increasing evaporation
when outdoor conditions are favorable.
10. When using a government-registered biocide, restorers must:
A. Apply extra for better effectiveness
B. Mix products freely
C. Apply according to label directions
D. Use only on visible mold
✅ Correct Answer: C
Rationale:
Federal law requires strict adherence to label directions. Misuse can cause health risks and legal violations.
11. Intentionally using outdoor air to reduce indoor humidity is called:
A. Closed drying
B. Open drying
C. Mechanical drying
D. Passive drying
✅ Correct Answer: B
Rationale:
An open drying system introduces outdoor air to reduce indoor humidity when exterior conditions are more
favorable than interior air.
UPDATE) WITH CORRECT/ACCURATE
ANSWERS
Water damage restoration technician certification offered by the
institute of inspection, cleaning and restoration certification
(iicrc)
PART 1 — QUESTIONS 1–20
1. When pre-existing damage is discovered during restoration, what should the restorer
do?
A. Ignore it if unrelated to the loss
B. Repair it at no cost
C. Photograph it but take no further action
D. Document and bring it to the attention of materially interested parties
✅ Correct Answer: D
Rationale:
The IICRC S500 requires restorers to document pre-existing damage and notify all materially interested
parties to prevent disputes and liability. Ignoring or repairing without authorization may result in legal or
financial consequences.
2. Rapid drying of structural materials is primarily achieved by which method?
A. Promoting evaporation and dehumidification or ventilation
B. Increasing temperature alone
C. Applying antimicrobials
D. Removing building materials immediately
✅ Correct Answer: A
Rationale:
Drying is most effective when evaporation is promoted at the surface and moisture is removed from the air
,via dehumidification or ventilation. Temperature alone does not remove moisture without vapor pressure
differential.
3. When carpet and cushion are saturated with Category 3 water, what is the proper
action?
A. Clean and reinstall
B. Remove and dispose of both
C. Dry in place with antimicrobials
D. Replace carpet only
✅ Correct Answer: B
Rationale:
Category 3 water contains pathogenic contaminants. Porous materials like carpet and cushion cannot be
adequately cleaned and must be removed and disposed of per IICRC standards.
4. To minimize safety concerns and speed drying, saturated and sagging drywall ceilings
should be:
A. Drained, removed quickly, and properly disposed
B. Dried in place
C. Painted to seal moisture
D. Left until contents are removed
✅ Correct Answer: A
Rationale:
Sagging drywall presents a collapse hazard. Prompt draining and removal protect workers and occupants
while preventing secondary damage and microbial growth.
5. The force exerted by water molecules in the air on surrounding surfaces is called:
A. Relative humidity
B. Vapor pressure
C. Dew point
D. Humidity ratio
✅ Correct Answer: B
,Rationale:
Vapor pressure drives moisture movement. Water moves from areas of high vapor pressure to low vapor
pressure, which is the basis of structural drying science.
6. The fastest evaporation from wet materials at 70°F (21°C) occurs in which environment?
A. 60°F (4°C) and 80% RH
B. 80°F (27°C) and 80% RH
C. 70°F (21°C) and 100% RH
D. 90°F (32°C) and 90% RH
✅ Correct Answer: A
Rationale:
Lower vapor pressure in the surrounding air increases evaporation. Even though cooler, the lower vapor
pressure at 60°F/80% RH promotes faster drying than warmer, humid air.
7. Two hazardous materials commonly found in older buildings requiring regulatory
compliance are:
A. Mold and bacteria
B. Silica and fiberglass
C. Lead-based paint and asbestos
D. Carbon monoxide and ozone
✅ Correct Answer: C
Rationale:
Older buildings may contain lead-based paint and asbestos, which are regulated by federal and state laws.
Improper handling can lead to serious health risks and legal penalties.
8. As humidity ratio increases, which psychrometric property also increases?
A. Relative humidity
B. Temperature
C. Vapor pressure
D. Dew point depression
✅ Correct Answer: C
, Rationale:
Humidity ratio and vapor pressure are directly related. As the amount of water vapor in air increases, vapor
pressure rises accordingly.
9. Ventilating a structure during early restoration helps enhance drying by reducing:
A. Temperature
B. Air movement
C. Humidity buildup
D. Vapor diffusion
✅ Correct Answer: C
Rationale:
Ventilation replaces moist indoor air with drier outdoor air, lowering humidity and increasing evaporation
when outdoor conditions are favorable.
10. When using a government-registered biocide, restorers must:
A. Apply extra for better effectiveness
B. Mix products freely
C. Apply according to label directions
D. Use only on visible mold
✅ Correct Answer: C
Rationale:
Federal law requires strict adherence to label directions. Misuse can cause health risks and legal violations.
11. Intentionally using outdoor air to reduce indoor humidity is called:
A. Closed drying
B. Open drying
C. Mechanical drying
D. Passive drying
✅ Correct Answer: B
Rationale:
An open drying system introduces outdoor air to reduce indoor humidity when exterior conditions are more
favorable than interior air.
