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| Section | Weight | Objectives |
|---|---|---|
| Principles of Water Damage Restoration | 20% | - IICRC S500 Standard overview - Categories of water damage (Clean, Grey, Black) - Classes of water loss (1–4) |
| Health, Safety & Microorganisms | 15% | - Microorganisms: mold, bacteria, pathogens - Personal protective equipment (PPE) - Sanitization and disinfection standards - Hazard identification and control |
| Effects of Water on Materials & Structures | 5% | - Determining restorable vs non-restorable items - Impact on building materials, contents, assemblies |
| Inspection, Assessment & Documentation | 15% | - Documentation and reporting requirements - Site inspection procedures - Moisture measurement and mapping |
| Drying Science & Psychrometry | 25% | - Equipment types: dehumidifiers, air movers, heaters - Psychrometric principles: humidity, temperature, airflow - Evaporation, condensation, dehumidification |
| Restoration Procedures | 20% | - Structural and material drying methods - Extraction and removal of water - Handling sanitary vs unsanitary water losses - Containment and contamination control |
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問題 #56
Which term describes the amount of moisture contained in an air sample as compared to the maximum amount the air sample could contain at that temperature?
答案：B
解題說明：
Relative humidity (RH) is defined in the WRT body of knowledge as the amount of moisture contained in an air sample compared to the maximum amount that the same air sample could contain at that temperature (i.e., at saturation). The WRT manual explains RH as a percentage measure on the psychrometric chart- expressing the proportion of moisture present versus what the air could hold if saturated at that same temperature.
This definition is essential because RH is temperature-dependent: as air temperature changes, RH changes even if the actual moisture content (humidity ratio) stays the same. The WRT reference emphasizes that air can hold more water vapor as temperature increases; therefore, increasing temperature decreases RH (with no added moisture), while decreasing temperature increases RH.
In restoration practice, RH is used as a practical indicator of the drying environment and a predictor of moisture behavior in hygroscopic materials. The WRT manual notes that hygroscopic materials have an equilibrium moisture content primarily determined by RH: when RH is low, materials generally lose moisture; when RH is high-especially above about 60%-materials tend to gain significant moisture, increasing the likelihood of secondary damage.
Although restorers frequently track humidity ratio (GPP) and vapor pressure to quantify drying force, RH remains a core operational measurement because it is directly readable from a thermo-hygrometer and aligns with material response risk thresholds. Consequently, RH is the correct term for the described comparison-to- maximum-at-temperature concept, and it is one of the foundational psychrometric variables used in WRT to manage drying conditions and prevent secondary damage.
問題 #57
A home has a drying chamber that is 7,500 cubic feet, the loss is a Class 3, and LGR dehumidifiers are used.
How many should be installed initially if the AHAM rating of each dehumidifier is 100 pints per day?
答案：B
解題說明：
The IICRC WRT body of knowledge provides initial LGR dehumidification recommendations based oncubic footage and class of water. ForClass 3 water intrusions, a commonly taught starting guideline is approximatelyone LGR dehumidifier (#100-150 PPD) per 3,000 cubic feetof affected space.
In this scenario, the drying chamber volume is 7,500 cubic feet. Dividing 7,500 by 3,000 yields 2.5 units.
Because dehumidifiers cannot be fractionally deployed and WRT guidance supports roundingupto ensure adequate moisture removal, the initial recommendation isthree LGR dehumidifiers.
The WRT manual emphasizes that this is an initial placement subject to adjustment after monitoring confirms drying progress. Insufficient dehumidification can increase ambient humidity, slow drying, and elevate secondary damage risk-particularly in Class 3 losses where evaporation rates are high.
Placing three units provides adequate capacity to manage evaporated moisture while allowing later downsizing as drying goals are achieved.
問題 #58
Which of the following is defined as removing water vapor from the air?
答案：A
解題說明：
The IICRC WRT body of knowledge definesdehumidificationas the process of removing water vapor from the air. This process is fundamental to restorative drying because evaporation alone does not remove moisture from a structure; it only changes liquid water into vapor. Without dehumidification (or ventilation), evaporated moisture would remain in the air and eventually re-condense on cooler surfaces.
The WRT curriculum explains that dehumidification works by reducing thehumidity ratio and vapor pressureof the air, thereby maintaining a vapor pressure differential that allows moisture to continue moving from wet materials into the surrounding environment. Refrigerant dehumidifiers accomplish this through condensation, while desiccant dehumidifiers remove moisture through adsorption.
Dehumidification must be properly balanced with airflow and temperature control. The WRT manual emphasizes that excessive evaporation without adequate dehumidification can increase ambient humidity, slow drying, and raise the risk of secondary damage. Conversely, effective dehumidification lowers relative humidity, reduces dew point, and supports sustained evaporation from wet materials.
Humidification is the opposite process, diffusion is passive vapor movement, and evaporation is only one step in the drying cycle. Only dehumidification actively removes water vapor from the air mass, making it the correct definition under WRT standards.
問題 #59
Which product provides the least amount of reduction in microorganisms?
答案：C
解題說明：
The IICRC WRT body of knowledge distinguishes antimicrobial products based on their intended level of microbial reduction. Asanitizerprovides theleast reduction in microorganisms, lowering microbial populations to levels considered acceptable by public health standards but not eliminating most organisms.
Disinfectants provide a higher level of reduction by killing or inactivating many microorganisms, fungicides specifically target fungi, and sterilizers destroy all forms of microbial life, including spores. Sanitizers are therefore the lowest tier in terms of antimicrobial effectiveness.
The WRT manual emphasizes that sanitizers are not appropriate for significant contamination scenarios such as Category 2 or Category 3 water losses. Using insufficient antimicrobial controls can result in persistent contamination and liability exposure.
Understanding these distinctions ensures restorers select appropriate products based on contamination level and regulatory guidance, reinforcing professional and compliant practice.
問題 #60
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 #61
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WRT考題: https://www.kaoguti.com/WRT_exam-pdf.html
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