IICRC WRT EXAM (2025/2026) COMPREHENSIVE QUESTIONS AND VERIFIED
ANSWERS ( DETAILED & ELABORATED) ACTUAL EXAM 2026 TEST!!
Question 1
At what minimum moisture level will wood surfaces support the growth of destructive wood-
decaying (rot) fungi?
A) 12%
B) 15%
C) 20%
D) 25%
E) 30%
Correct Answer: C) 20%
Rationale: Moisture levels of 20% or higher are required to provide enough water activity
for wood-rotting fungi to thrive and cause structural damage to wood surfaces.
Question 2
What is the definition of "Relative Humidity" (RH)?
A) The weight of water vapor in a pound of dry air
B) The temperature at which air reaches 100% saturation
C) The ratio of moisture suspended in air expressed as a percentage of total moisture-holding
capacity at a given temperature
D) The gaseous force exerted by water vapor on its environment
E) The speed at which moisture evaporates from a surface
Correct Answer: C) The ratio of moisture suspended in air expressed as a percentage of total
moisture-holding capacity at a given temperature
Rationale: Relative humidity is a "relative" measurement comparing how much water is
currently in the air versus the maximum amount that air could hold at that specific
temperature.
Question 3
In the restoration industry, what does the acronym "ACM" stand for?
A) Air Cooling Mechanism
B) Asbestos Containing Material
C) Atmospheric Content Monitor
D) Automated Calibration Meter
E) Applied Certified Mitigation
Correct Answer: B) Asbestos Containing Material
Rationale: Restoration technicians must identify ACM prior to disturbing older building
materials to ensure safety and regulatory compliance.
Question 4
How often should the "Daily Humidity Record" be updated to accurately monitor drying
progress?
A) Every 4 hours
, 2
B) Every 6-8 hours
C) Every 12-24 hours
D) Every 48 hours
E) Once at the beginning and once at the end of the project
Correct Answer: C) Every 12-24 hours
Rationale: Technicians must record humidity and temperature at least every 12 to 24 hours
to calculate GPP and verify that the drying environment is being maintained.
Question 5
Why is it important to isolate affected areas from non-affected areas during a water loss?
A) To prevent the customer from entering the work zone
B) Because areas not directly wet will experience humidity elevation
C) To prevent the use of electricity in unaffected rooms
D) To make the thermal camera work more effectively
E) To reduce the number of air movers required by law
Correct Answer: B) Because areas not directly wet will experience humidity elevation
Rationale: By isolating the wet area, technicians gain better control over the specific
environment, preventing secondary damage in dry areas caused by high humidity.
Question 6
What is the primary characteristic of Vapor Pressure in a confined space?
A) It always flows from low to high concentrations
B) It decreases as temperature increases
C) It will always seek a level of equilibrium
D) It is only present when materials are 100% saturated
E) It is unaffected by the use of dehumidifiers
Correct Answer: C) It will always seek a level of equilibrium
Rationale: Vapor pressure moves from areas of high pressure (wet materials) to areas of low
pressure (dry air) until the environment reaches a state of balance.
Question 7
How many grains of moisture are contained in one pound of dry air?
A) 1,000
B) 5,280
C) 7,000
D) 10,000
E) 14,000
Correct Answer: C) 7,000
Rationale: 7,000 grains per pound (GPP) is the standard unit of measurement used in
psychrometrics to determine the weight of water vapor in the air.
, 3
Question 8
Which term describes the actual weight of water in the air (by weight) contained in a specific
parcel of air?
A) Relative Humidity
B) Vapor Pressure
C) Humidity ratio/specific humidity
D) Dew Point
E) Evaporation rate
Correct Answer: C) Humidity ratio/specific humidity
Rationale: Specific humidity (measured in GPP) measures the actual weight of the water
vapor, regardless of the temperature of the air.
Question 9
What is the primary humidity goal for "Day 2" of the drying process?
A) Under 30% RH
B) Under 50% RH
C) Under 70% RH
D) Exactly 100% RH
E) There is no specific goal for Day 2
Correct Answer: C) Under 70% RH
Rationale: Getting the relative humidity below 70% by the second day is critical to ensure
proper mitigation and prevent the onset of microbial growth.
Question 10
The Dew Point is also commonly referred to as which of the following?
A) Vapor Pressure
B) Evaporation Point
C) Saturation temperature or condensation
D) Dry Bulb temperature
E) Latent Heat point
Correct Answer: C) Saturation temperature or condensation
Rationale: The Dew Point is the temperature at which the air can no longer hold its water
vapor and begins to condense into liquid water.
Question 11
What happens specifically at the "Dew Point" temperature?
A) Water begins to evaporate rapidly
B) The air reaches 50% relative humidity
C) The air becomes saturated with water vapor (100% RH) and condenses on cooler surfaces
D) Vapor pressure reaches zero
E) Dehumidifiers stop working effectively
ANSWERS ( DETAILED & ELABORATED) ACTUAL EXAM 2026 TEST!!
Question 1
At what minimum moisture level will wood surfaces support the growth of destructive wood-
decaying (rot) fungi?
A) 12%
B) 15%
C) 20%
D) 25%
E) 30%
Correct Answer: C) 20%
Rationale: Moisture levels of 20% or higher are required to provide enough water activity
for wood-rotting fungi to thrive and cause structural damage to wood surfaces.
Question 2
What is the definition of "Relative Humidity" (RH)?
A) The weight of water vapor in a pound of dry air
B) The temperature at which air reaches 100% saturation
C) The ratio of moisture suspended in air expressed as a percentage of total moisture-holding
capacity at a given temperature
D) The gaseous force exerted by water vapor on its environment
E) The speed at which moisture evaporates from a surface
Correct Answer: C) The ratio of moisture suspended in air expressed as a percentage of total
moisture-holding capacity at a given temperature
Rationale: Relative humidity is a "relative" measurement comparing how much water is
currently in the air versus the maximum amount that air could hold at that specific
temperature.
Question 3
In the restoration industry, what does the acronym "ACM" stand for?
A) Air Cooling Mechanism
B) Asbestos Containing Material
C) Atmospheric Content Monitor
D) Automated Calibration Meter
E) Applied Certified Mitigation
Correct Answer: B) Asbestos Containing Material
Rationale: Restoration technicians must identify ACM prior to disturbing older building
materials to ensure safety and regulatory compliance.
Question 4
How often should the "Daily Humidity Record" be updated to accurately monitor drying
progress?
A) Every 4 hours
, 2
B) Every 6-8 hours
C) Every 12-24 hours
D) Every 48 hours
E) Once at the beginning and once at the end of the project
Correct Answer: C) Every 12-24 hours
Rationale: Technicians must record humidity and temperature at least every 12 to 24 hours
to calculate GPP and verify that the drying environment is being maintained.
Question 5
Why is it important to isolate affected areas from non-affected areas during a water loss?
A) To prevent the customer from entering the work zone
B) Because areas not directly wet will experience humidity elevation
C) To prevent the use of electricity in unaffected rooms
D) To make the thermal camera work more effectively
E) To reduce the number of air movers required by law
Correct Answer: B) Because areas not directly wet will experience humidity elevation
Rationale: By isolating the wet area, technicians gain better control over the specific
environment, preventing secondary damage in dry areas caused by high humidity.
Question 6
What is the primary characteristic of Vapor Pressure in a confined space?
A) It always flows from low to high concentrations
B) It decreases as temperature increases
C) It will always seek a level of equilibrium
D) It is only present when materials are 100% saturated
E) It is unaffected by the use of dehumidifiers
Correct Answer: C) It will always seek a level of equilibrium
Rationale: Vapor pressure moves from areas of high pressure (wet materials) to areas of low
pressure (dry air) until the environment reaches a state of balance.
Question 7
How many grains of moisture are contained in one pound of dry air?
A) 1,000
B) 5,280
C) 7,000
D) 10,000
E) 14,000
Correct Answer: C) 7,000
Rationale: 7,000 grains per pound (GPP) is the standard unit of measurement used in
psychrometrics to determine the weight of water vapor in the air.
, 3
Question 8
Which term describes the actual weight of water in the air (by weight) contained in a specific
parcel of air?
A) Relative Humidity
B) Vapor Pressure
C) Humidity ratio/specific humidity
D) Dew Point
E) Evaporation rate
Correct Answer: C) Humidity ratio/specific humidity
Rationale: Specific humidity (measured in GPP) measures the actual weight of the water
vapor, regardless of the temperature of the air.
Question 9
What is the primary humidity goal for "Day 2" of the drying process?
A) Under 30% RH
B) Under 50% RH
C) Under 70% RH
D) Exactly 100% RH
E) There is no specific goal for Day 2
Correct Answer: C) Under 70% RH
Rationale: Getting the relative humidity below 70% by the second day is critical to ensure
proper mitigation and prevent the onset of microbial growth.
Question 10
The Dew Point is also commonly referred to as which of the following?
A) Vapor Pressure
B) Evaporation Point
C) Saturation temperature or condensation
D) Dry Bulb temperature
E) Latent Heat point
Correct Answer: C) Saturation temperature or condensation
Rationale: The Dew Point is the temperature at which the air can no longer hold its water
vapor and begins to condense into liquid water.
Question 11
What happens specifically at the "Dew Point" temperature?
A) Water begins to evaporate rapidly
B) The air reaches 50% relative humidity
C) The air becomes saturated with water vapor (100% RH) and condenses on cooler surfaces
D) Vapor pressure reaches zero
E) Dehumidifiers stop working effectively
