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Water Damage Restoration Technician (WRT)
Exam Practice Questions | 2026-2027
ANSI/IICRC S500:2021 Standard
Academic Year: 2026/2027 Verified Answers with Rationales
Question 1
A Class 3 intrusion that measures 15' x 35' and has a ceiling height of 9', how many 100-pint
LGRs are needed?
A. 1
B. 2
C. 3
D. 4
CORRECT ANSWER B. 2
RATIONALE: Volume: 15x35x9 = 4725 cu ft. Class 3 requires 100 PPD per 2000-3000 cu ft. 4725 ÷ 2500
≈ 2 units.
,Question 2
Lead and asbestos are hazardous materials regulated by the Federal government. True or
False
A. True
B. False
CORRECT ANSWER A. True
RATIONALE: Lead and asbestos are regulated by federal agencies including EPA and OSHA under laws
such as the Toxic Substances Control Act and Clean Air Act.
Question 3
If a drying chamber is 75 degrees and 40% RH, what is the humidity ratio
A. 27 gpp
B. 39 gpp
C. 52 gpp
D. 124 gpp
CORRECT ANSWER C. 52 gpp
RATIONALE: At 75°F and 40% RH, the humidity ratio is approximately 52 grains per pound (gpp) based
on standard psychrometric charts.
,Question 4
What is more likely to occur when heat is applied to wet materials
A. Sublimation
B. Condensation
C. Evaporation
D. Adsorption
CORRECT ANSWER C. Evaporation
RATIONALE: Adding heat to wet materials increases the rate of evaporation by raising the vapor
pressure of the water in the materials.
Question 5
When does condensation happen?
A. When a material surface is at Dew Point or below
B. When a material surface is at or above dew point
C. When materials can't hold more moisture
D. When GPP is higher than RH
CORRECT ANSWER A. When a material surface is at Dew Point or below
RATIONALE: Condensation occurs when a surface temperature is at or below the dew point, causing
water vapor to change to liquid.
, Question 6
One thing that can be done if attempting to dry a hard surface floor such as marble, tile or
stone and the wood subfloor below it would be?
A. Remove tiles to dry the subfloor, then replace them
B. Set up a containment
C. Add additional heat or thermal energy
D. Cool the area to cause the moisture to condense out
CORRECT ANSWER C. Add additional heat or thermal energy
RATIONALE: Adding heat increases evaporation from the subfloor through the porous stone/tile
surface.
Question 7
Which term describes the rate of water vapor passing through a material?
A. Capillarity
B. Permeance
C. Condensation
D. Wicking
CORRECT ANSWER B. Permeance
RATIONALE: Permeance is the rate at which water vapor passes through a material of specific
thickness.
Water Damage Restoration Technician (WRT)
Exam Practice Questions | 2026-2027
ANSI/IICRC S500:2021 Standard
Academic Year: 2026/2027 Verified Answers with Rationales
Question 1
A Class 3 intrusion that measures 15' x 35' and has a ceiling height of 9', how many 100-pint
LGRs are needed?
A. 1
B. 2
C. 3
D. 4
CORRECT ANSWER B. 2
RATIONALE: Volume: 15x35x9 = 4725 cu ft. Class 3 requires 100 PPD per 2000-3000 cu ft. 4725 ÷ 2500
≈ 2 units.
,Question 2
Lead and asbestos are hazardous materials regulated by the Federal government. True or
False
A. True
B. False
CORRECT ANSWER A. True
RATIONALE: Lead and asbestos are regulated by federal agencies including EPA and OSHA under laws
such as the Toxic Substances Control Act and Clean Air Act.
Question 3
If a drying chamber is 75 degrees and 40% RH, what is the humidity ratio
A. 27 gpp
B. 39 gpp
C. 52 gpp
D. 124 gpp
CORRECT ANSWER C. 52 gpp
RATIONALE: At 75°F and 40% RH, the humidity ratio is approximately 52 grains per pound (gpp) based
on standard psychrometric charts.
,Question 4
What is more likely to occur when heat is applied to wet materials
A. Sublimation
B. Condensation
C. Evaporation
D. Adsorption
CORRECT ANSWER C. Evaporation
RATIONALE: Adding heat to wet materials increases the rate of evaporation by raising the vapor
pressure of the water in the materials.
Question 5
When does condensation happen?
A. When a material surface is at Dew Point or below
B. When a material surface is at or above dew point
C. When materials can't hold more moisture
D. When GPP is higher than RH
CORRECT ANSWER A. When a material surface is at Dew Point or below
RATIONALE: Condensation occurs when a surface temperature is at or below the dew point, causing
water vapor to change to liquid.
, Question 6
One thing that can be done if attempting to dry a hard surface floor such as marble, tile or
stone and the wood subfloor below it would be?
A. Remove tiles to dry the subfloor, then replace them
B. Set up a containment
C. Add additional heat or thermal energy
D. Cool the area to cause the moisture to condense out
CORRECT ANSWER C. Add additional heat or thermal energy
RATIONALE: Adding heat increases evaporation from the subfloor through the porous stone/tile
surface.
Question 7
Which term describes the rate of water vapor passing through a material?
A. Capillarity
B. Permeance
C. Condensation
D. Wicking
CORRECT ANSWER B. Permeance
RATIONALE: Permeance is the rate at which water vapor passes through a material of specific
thickness.
