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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Drying Science & Psychrometry | 25% | - Psychrometric principles: humidity, temperature, airflow - Evaporation, condensation, dehumidification - Equipment types: dehumidifiers, air movers, heaters |
| Topic 2: Restoration Procedures | 20% | - Containment and contamination control - Extraction and removal of water - Handling sanitary vs unsanitary water losses - Structural and material drying methods |
| Topic 3: Principles of Water Damage Restoration | 20% | - IICRC S500 Standard overview - Categories of water damage (Clean, Grey, Black) - Classes of water loss (1–4) |
| Topic 4: Inspection, Assessment & Documentation | 15% | - Documentation and reporting requirements - Moisture measurement and mapping - Site inspection procedures |
| Topic 5: Effects of Water on Materials & Structures | 5% | - Determining restorable vs non-restorable items - Impact on building materials, contents, assemblies |
| Topic 6: Health, Safety & Microorganisms | 15% | - Microorganisms: mold, bacteria, pathogens - Sanitization and disinfection standards - Hazard identification and control - Personal protective equipment (PPE) |
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NEW QUESTION # 16
In a home with a Class 2 intrusion, where the floor is 1,300 square feet with an 8-foot ceiling, what is the initial recommended Pints Per Day (PPD) if using LGR dehumidifiers?
Answer: D
Explanation:
The IICRC WRT body of knowledge teaches that initial dehumidification capacity for LGR dehumidifiers is based oncubic footage and class of water intrusion. Class 2 intrusions involve a larger amount of moisture absorption than Class 1 but do not reach the full saturation of Class 3.
First, calculate the affected volume:
1,300 sq ft × 8 ft =10,400 cubic feet.
ForClass 2 losses, a commonly accepted WRT guideline is approximatelyone LGR dehumidifier (#200-210 PPD)per10,000-12,000 cubic feet. This capacity balances evaporation demand without over-drying or inefficiency.
A recommendation of 208 PPD aligns directly with this guidance and reflects standard WRT training tables used for initial equipment placement. Lower values (26 or 99 PPD) are insufficient for the moisture load, while 303 PPD exceeds the initial requirement for a Class 2 loss and would require justification through monitoring data.
The WRT manual emphasizes that this is aninitial recommendationand must be validated by daily psychrometric and material moisture monitoring. Equipment may be adjusted as drying progresses.
NEW QUESTION # 17
What type of material is most likely to be affected by secondary damage caused by high humidity?
Answer: D
Explanation:
The IICRC WRT body of knowledge identifieshygroscopic materialsas the most susceptible to secondary damage caused by elevated humidity. Hygroscopic materials readily absorb and release moisture from the surrounding air until they reach equilibrium with ambient relative humidity. Common examples include wood, paper, drywall, textiles, and many composite building materials.
The WRT manual explains that when relative humidity rises-particularly above safe thresholds- hygroscopic materials absorb moisture even without direct water contact. This can lead to swelling, warping, loss of structural integrity, finish failure, corrosion of fasteners, and increased microbial risk. This process is known assecondary damage, because it occurs after the initial water intrusion and is driven by uncontrolled environmental conditions.
Unabsorbent, hydrophobic, and non-porous materials resist moisture absorption and are far less affected by high humidity alone. While condensation may occur on these surfaces, they do not readily absorb moisture into their structure.
Because of this behavior, the WRT curriculum emphasizes aggressive humidity control during drying-not only to dry wet materials but also to protect unaffected hygroscopic materials within the drying chamber.
Monitoring relative humidity and vapor pressure is therefore essential to prevent secondary damage.
NEW QUESTION # 18
What should a restorer do when there is contamination (e.g., Category 2, Category 3, Mold) on a water damage restoration project to protect workers and occupants?
Answer: D
Explanation:
The IICRC WRT body of knowledge emphasizes that when contamination is present, the restorer's responsibility is toprotect workers and occupantsby implementing appropriate controls. This includes the use ofpersonal protective equipment (PPE),containment systems, andengineering or administrative controlsas dictated by the hazard assessment.
Category 2 and Category 3 water, as well as mold-contaminated environments, can expose individuals to microorganisms, allergens, and other harmful agents. The WRT manual reinforces the hierarchy of controls:
eliminate hazards when possible, isolate hazards through containment, and protect workers with PPE when hazards cannot be fully removed.
Fogging disinfectants or wiping surfaces does not eliminate airborne or surface hazards and may actually increase aerosolization if done improperly. Contacting the insurance company is an administrative step and does not mitigate health risks.
The WRT curriculum also aligns with OSHA principles, stressing that safety controls must be implemented beforeandduringrestoration activities. Proper containment and PPE selection are essential to prevent cross- contamination and protect both restoration personnel and building occupants.
NEW QUESTION # 19
Which device is used to measure the temperature and relative humidity of the air?
Answer: A
Explanation:
Athermo-hygrometeris the instrument identified in the IICRC WRT body of knowledge for measuring both air temperature and relative humidity. These two measurements are fundamental inputs for psychrometric evaluation and drying documentation.
The WRT curriculum explains that accurate air readings allow restorers to calculate additional psychrometric values such as humidity ratio, dew point, and vapor pressure-either manually or using built-in instrument calculations. These values are critical for assessing drying conditions, equipment performance, and the effectiveness of the drying strategy.
Moisture meters and moisture sensors are used to measure moisture in materials, not air. A thermometer measures temperature only and cannot determine moisture content or humidity conditions. The thermo- hygrometer integrates both functions into a single instrument, making it a required tool for daily monitoring under the WRT standard of care.
The WRT manual further stresses consistency in air measurements, recommending similar measurement locations and procedures during each monitoring visit to ensure defensible documentation.
NEW QUESTION # 20
When is a closed drying system recommended during restoration?
Answer: C
Explanation:
The IICRC WRT body of knowledge defines aclosed drying systemas one in which indoor air is isolated from outdoor air, relying on mechanical dehumidification rather than ventilation. A closed system is recommendedwhen the outdoor humidity ratio is higher than the indoor humidity ratio.
Introducing outside air with a higher humidity ratio would add moisture to the drying environment, reducing evaporation potential and increasing the risk of secondary damage. The WRT manual emphasizes that ventilation decisions must be based on psychrometric comparison-not convenience or assumptions about temperature.
Closed systems allow restorers to control indoor conditions precisely using dehumidifiers, air movers, and temperature management. This approach is particularly important during humid weather, rain events, or in climates where outdoor air consistently contains more moisture than indoor air.
Building security, equipment monitoring frequency, or the availability of dry outdoor air do not determine whether a closed system is appropriate. The determining factor is always moisture content of the air.
This guidance reinforces the WRT principle that effective drying depends oncontrolling vapor pressure differentials, which can only be achieved by preventing moisture-laden air from entering the drying chamber.
NEW QUESTION # 21
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