IICRC WRT (WATER RESTORATION
TECHNICIAN) ADVANCED
CERTIFICATION EXAM
1. Which category of water originates from a source that does not pose substantial harm to
humans, such as a broken water supply line?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Answer: A
Conceptual Explanation: Category 1 water is clean water that originated from a sanitary
source and does not pose a substantial risk from dermal, ingestion, or inhalation exposure.
2. A water intrusion involving a large amount of water absorbed by low-evaporation
materials (such as plaster or concrete) is classified as:
A. Class 1
B. Class 2
C. Class 4
,D. Class 3
Answer: C
Conceptual Explanation: Class 4 water intrusions involve specialty drying situations with
deep-seated moisture in low-porosity/low-evaporation materials.
3. What is the weight of water vapor in the air, measured in grains per pound (GPP)?
A. Relative Humidity
B. Humidity Ratio (Specific Humidity)
C. Vapor Pressure
D. Dew Point
Answer: B
Conceptual Explanation: Humidity Ratio, also known as Specific Humidity, is the actual
weight of water vapor in the air measured in grains per pound (gpp).
4. At what temperature does the air become saturated and condensation begins to form on
surfaces?
A. Vapor Point
B. Evaporation Point
C. Dew Point
D. Saturation Point
, Answer: C
Conceptual Explanation: Dew point is the temperature at which air is 100% saturated
(100% RH) and can no longer hold water vapor, causing condensation.
5. Which type of dehumidifier is most effective in environments with temperatures below
70°F and very low humidity levels?
A. Standard Refrigerant
B. Desiccant
C. Low Grain Refrigerant (LGR)
D. Conventional Air Mover
Answer: B
Conceptual Explanation: Desiccant dehumidifiers use chemical attraction to pull moisture
and can operate effectively at much lower vapor pressures and temperatures than
refrigerant units.
6. According to the IICRC S500, what is the initial recommended placement of air movers for a
water loss?
A. One for every 50-60 square feet
B. One per room regardless of size
C. One for every 10-16 linear feet of wall space
D. One for every 100 square feet of floor space
TECHNICIAN) ADVANCED
CERTIFICATION EXAM
1. Which category of water originates from a source that does not pose substantial harm to
humans, such as a broken water supply line?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Answer: A
Conceptual Explanation: Category 1 water is clean water that originated from a sanitary
source and does not pose a substantial risk from dermal, ingestion, or inhalation exposure.
2. A water intrusion involving a large amount of water absorbed by low-evaporation
materials (such as plaster or concrete) is classified as:
A. Class 1
B. Class 2
C. Class 4
,D. Class 3
Answer: C
Conceptual Explanation: Class 4 water intrusions involve specialty drying situations with
deep-seated moisture in low-porosity/low-evaporation materials.
3. What is the weight of water vapor in the air, measured in grains per pound (GPP)?
A. Relative Humidity
B. Humidity Ratio (Specific Humidity)
C. Vapor Pressure
D. Dew Point
Answer: B
Conceptual Explanation: Humidity Ratio, also known as Specific Humidity, is the actual
weight of water vapor in the air measured in grains per pound (gpp).
4. At what temperature does the air become saturated and condensation begins to form on
surfaces?
A. Vapor Point
B. Evaporation Point
C. Dew Point
D. Saturation Point
, Answer: C
Conceptual Explanation: Dew point is the temperature at which air is 100% saturated
(100% RH) and can no longer hold water vapor, causing condensation.
5. Which type of dehumidifier is most effective in environments with temperatures below
70°F and very low humidity levels?
A. Standard Refrigerant
B. Desiccant
C. Low Grain Refrigerant (LGR)
D. Conventional Air Mover
Answer: B
Conceptual Explanation: Desiccant dehumidifiers use chemical attraction to pull moisture
and can operate effectively at much lower vapor pressures and temperatures than
refrigerant units.
6. According to the IICRC S500, what is the initial recommended placement of air movers for a
water loss?
A. One for every 50-60 square feet
B. One per room regardless of size
C. One for every 10-16 linear feet of wall space
D. One for every 100 square feet of floor space
