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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Restoration Procedures | 20% | - Extraction and removal of water - Handling sanitary vs unsanitary water losses - Containment and contamination control - Structural and material drying methods |
| Topic 2: Effects of Water on Materials & Structures | 5% | - Determining restorable vs non-restorable items - Impact on building materials, contents, assemblies |
| Topic 3: Drying Science & Psychrometry | 25% | - Psychrometric principles: humidity, temperature, airflow - Evaporation, condensation, dehumidification - Equipment types: dehumidifiers, air movers, heaters |
| Topic 4: Principles of Water Damage Restoration | 20% | - Classes of water loss (1–4) - IICRC S500 Standard overview - Categories of water damage (Clean, Grey, Black) |
| Topic 5: Health, Safety & Microorganisms | 15% | - Sanitization and disinfection standards - Hazard identification and control - Personal protective equipment (PPE) - Microorganisms: mold, bacteria, pathogens |
| Topic 6: Inspection, Assessment & Documentation | 15% | - Documentation and reporting requirements - Site inspection procedures - Moisture measurement and mapping |
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問題 #19
Which class of water intrusion is it where the affected materials represent approximately 5% to 40% of the combined surface area in the space and where materials described as low-evaporation materials or assemblies have absorbed minimal moisture?
答案：C
解題說明：
The IICRC WRT body of knowledge definesClass 2 water intrusionas a condition where asignificant portion of a room (approximately 5% to 40% of combined surface area)is affected, and where moisture has wicked into structural materials such as carpet, cushion, and drywall, but absorption remains relatively shallow.
Class 2 losses typically involve wet carpet and cushion with minimal wall saturation. Evaporation rates are higher than Class 1 but do not reach the extensive saturation levels of Class 3. Low-evaporation materials may be affected, but moisture penetration remains limited.
The WRT manual uses this classification to guide equipment selection, drying strategy, and time expectations.
Class 1 involves minimal absorption, Class 3 involves extensive saturation of ceilings, walls, and insulation, and Class 4 involves deeply bound water.
Accurate classification during initial inspection is essential for defensible restoration planning under the IICRC standard of care.
問題 #20
Which of the following is an initial method to search for moisture in surfaces such as wood flooring, gypsum wallboard, resilient flooring, ceramic tile, and plaster?
答案：C
解題說明：
The IICRC WRT body of knowledge identifiesnon-penetrating (non-invasive) moisture metersas the preferredinitialmethod for surveying moisture in a wide range of building materials. These devices allow restorers to rapidly scan large surface areas without damaging finished materials, making them ideal for initial inspection and moisture mapping.
Non-invasive meters work by emitting electromagnetic signals that respond to changes in material density and moisture presence. While they do not provide precise moisture content values, they are effective at identifying areas of concern that warrant further investigation.
The WRT manual stresses that invasive meters, material removal, or drilling should only be performedafter non-invasive methods indicate elevated readings and when confirmation is required. This tiered approach minimizes unnecessary damage while still ensuring accurate assessment.
Additionally, non-invasive meters are particularly useful on surfaces like ceramic tile or plaster, where penetrating probes may be impractical or destructive. Proper documentation requires that readings be repeatable and defensible, and starting with non-invasive tools supports both goals.
問題 #21
What is recommended to minimize or control airborne contaminants during restoration?
答案：C
解題說明：
The IICRC WRT body of knowledge recommends the use ofAir Filtration Devices (AFDs)to minimize and control airborne contaminants during restoration activities. AFDs equipped with HEPA filtration capture airborne particulates, including dust, microbial fragments, and other contaminants generated during mitigation.
The WRT manual explains that uncontrolled airborne contaminants can pose health risks to workers and occupants and can spread contamination to unaffected areas. AFDs reduce this risk by continuously filtering air and, when properly configured, creating negative pressure within containment zones.
Dehumidifiers manage moisture, not particulates. Air movers can increase aerosolization if used improperly.
HVAC systems are not designed for contamination control during restoration and may spread contaminants throughout the structure.
AFDs are therefore the recommended engineering control for airborne contaminant management under the WRT standard of care.
問題 #22
What is the process used by refrigerant dehumidifiers to remove water from the air?
答案：C
解題說明：
Refrigerant dehumidifiers remove moisture from the air through the process ofcondensation, as outlined in the IICRC WRT body of knowledge. In this process, warm, moist air is drawn across a cold evaporator coil inside the dehumidifier. When the air temperature is reduced below its dew point, water vapor changes phase from a gas to a liquid and condenses on the coil surface.
The collected liquid water then drains into a reservoir or is pumped out of the unit, while the dried air is reheated slightly and discharged back into the drying chamber. This mechanism is fundamental to both conventional refrigerant and low-grain refrigerant (LGR) dehumidifiers.
The WRT curriculum contrasts condensation withadsorption, which is used by desiccant dehumidifiers, and absorption, which involves liquids-not air drying. Sublimation (solid to vapor) is not relevant to restoration drying.
Understanding condensation is essential because refrigerant dehumidifiers rely on sufficient temperature and humidity conditions to function efficiently. The WRT manual highlights operational limits and emphasizes monitoring to ensure that refrigerant systems are appropriate for the environmental conditions present on the job.
問題 #23
Which best describes Category 2 water?
答案：C
解題說明：
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.
問題 #24
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