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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Principles of Water Damage Restoration | 20% | - Categories of water damage (Clean, Grey, Black) - Classes of water loss (1–4) - IICRC S500 Standard overview |
| Topic 2: Inspection, Assessment & Documentation | 15% | - Moisture measurement and mapping - Documentation and reporting requirements - Site inspection procedures |
| Topic 3: Effects of Water on Materials & Structures | 5% | - Impact on building materials, contents, assemblies - Determining restorable vs non-restorable items |
| Topic 4: Health, Safety & Microorganisms | 15% | - Hazard identification and control - Personal protective equipment (PPE) - Sanitization and disinfection standards - Microorganisms: mold, bacteria, pathogens |
| Topic 5: Restoration Procedures | 20% | - Handling sanitary vs unsanitary water losses - Extraction and removal of water - Containment and contamination control - Structural and material drying methods |
| Topic 6: Drying Science & Psychrometry | 25% | - Psychrometric principles: humidity, temperature, airflow - Evaporation, condensation, dehumidification - Equipment types: dehumidifiers, air movers, heaters |
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質問 # 84
What happens when the surface temperature of a material is at or below the dew point temperature of the air?
正解：D
解説：
According to the IICRC WRT body of knowledge,condensationoccurs when the surface temperature of a material is at or below the dew point temperature of the surrounding air. Under these conditions, the air can no longer hold all of its water vapor, and moisture changes phase from vapor to liquid on the cooler surface.
This principle is fundamental to psychrometry and is directly applicable to water damage restoration. The WRT manual emphasizes that condensation represents amoisture gain, not moisture removal, and therefore counteracts drying efforts. When condensation occurs on structural materials, it can increase moisture content, prolong drying time, and contribute to secondary damage such as microbial growth or corrosion.
Restorers are trained to compare indoor air dew point measurements with surface temperatures of materials using thermo-hygrometers and infrared thermometers. If surface temperatures are below the dew point, corrective action-such as increasing temperature, improving dehumidification, or adjusting airflow-is required.
This concept also explains why cold surfaces like metal framing, concrete, or supply ductwork can develop moisture even without direct water exposure. The WRT curriculum stresses proactive monitoring to prevent unintended condensation events during drying.
質問 # 85
Which term is defined as the process of water changing from a liquid to a gas?
正解：B
解説：
The IICRC WRT body of knowledge definesevaporationas the process by which water changes from a liquid state to a gaseous (vapor) state. This process is central to restorative drying because it is how moisture leaves wet materials.
The WRT manual explains that evaporation occurs at the surface of materials and is influenced by airflow, surface temperature, humidity, and vapor pressure differential. Evaporation alone does not remove moisture from the structure; it must be paired with dehumidification or ventilation to remove the vapor from the air.
Hydrostatic refers to water pressure, sublimation is the change from solid to gas, and dehumidification removes vapor from air-not liquid from materials. Understanding evaporation allows restorers to design drying systems that maximize moisture release while preventing condensation and secondary damage.
質問 # 86
When should water damage restoration services begin?
正解：D
解説：
The IICRC WRT body of knowledge states that water damage restoration services should beginafter a restorer has entered into a properly written contractwith the property owner or authorized representative.
This ensures that scope, responsibilities, authorization, and limitations are clearly defined before work begins.
While emergency actions may be necessary to prevent imminent damage, the WRT standard emphasizes the importance of legal and professional authorization prior to performing restoration services. A written agreement protects both the restorer and the client by establishing expectations, access rights, and documentation requirements.
Submitting surveys, delivering equipment, or determining drying standards are procedural steps that occur after authorization is secured. Beginning work without authorization exposes the restorer to liability and disputes.
This requirement aligns with the WRT emphasis on professionalism, transparency, and defensibility.
質問 # 87
Which is typically a result of introducing warm, dry air movement into wall cavities?
正解：A
解説：
The IICRC WRT body of knowledge explains that introducingwarm, dry air movement into wall cavities typically results in anincreased rate of evaporation. Warm air raises the temperature of wet materials, increasing vapor pressure within those materials, while dry air lowers ambient vapor pressure-together creating a strong vapor pressure differential.
This differential accelerates moisture movement from materials into the air. The WRT manual notes that cavity drying systems, including inter-air drying, are designed to deliver controlled airflow and low-humidity air directly to concealed wet surfaces, where natural evaporation would otherwise be limited.
Negative pressure may occur in certain containment setups, but it is not the primary outcome of warm, dry airflow into cavities. Temperature reduction contradicts the drying mechanism, and decreased evaporation would indicate system failure rather than expected performance.
The WRT curriculum emphasizes that controlled cavity airflow is an effective technique when materials are restorable and contamination conditions allow, reinforcing evaporation as the intended result.
質問 # 88
Which best describes Category 2 water?
正解：C
解説：
The IICRC WRT body of knowledge definesCategory 2 wateras water that contains significant contamination and has the potential to cause discomfort or illness if contacted or consumed. This classification recognizes that while Category 2 water is not grossly contaminated like Category 3, it is no longer considered clean or sanitary.
Examples commonly cited in the WRT manual include dishwasher or washing machine discharge, toilet overflows with urine but no feces, and seepage due to hydrostatic pressure. These sources may contain microorganisms, nutrients for microbial growth, or other contaminants that pose health concerns.
The WRT standard emphasizes that Category 2 water presents anelevated health riskand requires enhanced controls compared to Category 1. This may include increased PPE, more aggressive cleaning, and careful evaluation of materials for restorability. Porous materials affected by Category 2 water may need to be removed depending on exposure time and degree of absorption.
Importantly, the WRT body of knowledge highlights that water candegrade in categoryover time if left untreated. Category 2 water can become Category 3 due to microbial amplification, reinforcing the importance of timely mitigation and proper classification during the initial inspection.
質問 # 89
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