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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Inspection, Assessment & Documentation | 15% | - Site inspection procedures - Moisture measurement and mapping - Documentation and reporting requirements |
| Topic 2: Drying Science & Psychrometry | 25% | - Equipment types: dehumidifiers, air movers, heaters - Evaporation, condensation, dehumidification - Psychrometric principles: humidity, temperature, airflow |
| Topic 3: Restoration Procedures | 20% | - Extraction and removal of water - Structural and material drying methods - Handling sanitary vs unsanitary water losses - Containment and contamination control |
| Topic 4: Health, Safety & Microorganisms | 15% | - Microorganisms: mold, bacteria, pathogens - Personal protective equipment (PPE) - Sanitization and disinfection standards - Hazard identification and control |
| Topic 5: Effects of Water on Materials & Structures | 5% | - Determining restorable vs non-restorable items - Impact on building materials, contents, assemblies |
| Topic 6: Principles of Water Damage Restoration | 20% | - Categories of water damage (Clean, Grey, Black) - IICRC S500 Standard overview - Classes of water loss (1–4) |
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질문 # 86
A technician has arrived at a large vacant home where the basement is lightly affected and is considered a Class 1. There are six LGR dehumidifiers on the truck that each have an AHAM rating of 110 pints per day (PPD). How many are initially recommended to be placed if the affected area is 22,000 cubic feet?
정답：D
설명：
The IICRC WRT body of knowledge provides guidance for determining initial dehumidification capacity based oncubic footage,class of water, andtype of dehumidifier. ForClass 1 water intrusions, which involve minimal moisture absorption and evaporation primarily from structural materials, the recommended starting point is approximatelyone LGR dehumidifier per 10,000 to 12,000 cubic feetof affected space.
In this scenario, the basement volume is 22,000 cubic feet. Applying the WRT initial calculation method, dividing 22,000 cubic feet by 10,000-12,000 cubic feet per unit results in a requirement of approximatelytwo LGR dehumidifiers. Although six units are available on the truck, the WRT standard emphasizes that equipment placement should be based on need-not availability. Over-dehumidification can be inefficient, unnecessary, and difficult to justify to materially interested parties.
The WRT manual also stresses that this is aninitial recommendation, subject to adjustment after psychrometric monitoring confirms whether drying goals are being met. Because the structure is vacant and the intrusion is Class 1, the moisture load is relatively low, and excessive equipment would not improve drying efficiency. Instead, proper airflow, monitoring, and controlled humidity reduction are the priority.
This approach aligns with IICRC principles that restorers should place sufficient equipment to create effective drying conditions without introducing waste, excessive power consumption, or unjustified costs.
질문 # 87
What does a restorer need to know to determine the initial dehumidification capacity recommendation?
정답：C
설명：
According to the IICRC WRT body of knowledge, theinitial dehumidification capacity recommendationis determined by three primary factors:cubic footage of the affected area,class of water intrusion, andtype of dehumidifierbeing used. This calculation establishes a baseline moisture removal capability required to manage the anticipated evaporation load.
Cubic footage defines the volume of air within the drying chamber and directly influences how much moisture must be removed from the environment. Theclass of waterdescribes how much moisture has been absorbed by materials and the rate of evaporation expected. Higher classes (Class 3 and 4) require substantially more dehumidification capacity due to increased moisture loading and deeply absorbed water.
Thetype of dehumidifieris equally critical because different technologies (conventional refrigerant, LGR, desiccant) have vastly different operating ranges, efficiencies, and moisture removal characteristics. The WRT manual specifically differentiates capacity calculations for LGR versus desiccant systems, as they function under different psychrometric conditions.
Factors such as category of water, subfloor type, or air mover quantity influenceprocedural decisions, safety, and drying strategy-but they are not part of the initial capacity calculation. Likewise, grain depression is a performance outcome used for evaluation, not an input variable.
This structured approach ensures consistency, defensibility, and alignment with the ANSI/IICRC S500 Standard, enabling restorers to justify equipment placement using measurable, science-based criteria rather than guesswork or habit.
질문 # 88
Which material loses most of its structural integrity when wet but regains its strength when dry?
정답：A
설명：
Gypsum board (drywall) is identified in the WRT body of knowledge as highly vulnerable to moisture exposure, yet capable of recovering strength when dried-provided it has not sustained irreversible primary damage. The WRT manual explains that gypsum wallboard is among the most moisture-sensitive common building materials, showing rapid and dramatic change with elevated moisture levels. However, it also states that gypsum has a greater ability to recover than many other engineered products.
Critically, the WRT guidance distinguishes between primary damage (immediate structural failure) and recoverable wetting. For example, overhead or horizontally installed gypsum that becomes wet can lose structural integrity, sag, and create a significant safety concern; this sagging is considered permanent damage and requires removal.
In contrast, when gypsum board installed vertically on walls is wet but has not experienced primary damage (e.g., not structurally compromised, not severely deteriorated, and appropriate contamination considerations are addressed), the WRT manual notes that it can restore: during the drying process, gypsum's original strength is restored, and after drying it may even be slightly stronger (though sometimes more brittle). This recovery characteristic is what makes gypsum board the best match to the question's description-losing structural integrity when wet yet regaining strength when properly dried.
This material behavior is central to WRT decision-making: whether to dry in place, perform limited disruption (e.g., baseboard removal and cavity airflow), or remove materials for safety/health reasons. The WRT body of knowledge treats gypsum as potentially restorable depending on installation orientation, degree of damage, and contamination risk, which is why it is specifically described as losing integrity when wet and regaining strength when dry.
질문 # 89
Which term is defined as the process of water changing from a liquid to a gas?
정답：A
설명：
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.
질문 # 90
Which of the following regulated hazardous materials require compliance with federal and local laws and regulations to remove or repair?
정답：D
설명：
The IICRC WRT body of knowledge explicitly recognizes lead-based paint and asbestos-containing materials as regulated hazardous materials that require compliance with federal, state, and local laws when disturbed, removed, or repaired. These materials pose significant health risks when fibers or particles become airborne and are therefore subject to strict regulatory oversight.
Lead-based paint, commonly found in structures built before regulatory bans, can produce hazardous dust during demolition or sanding. Asbestos-containing adhesives, mastics, or building materials can release microscopic fibers when disturbed, leading to long-term respiratory disease risks. The WRT manual emphasizes that restoration technicians must not disturb regulated materials unless they are properly trained, certified, and authorized to do so, or unless licensed specialists are retained.
The presence of regulated materials must be identified during the initial inspection and hazard assessment, and work plans must be adjusted accordingly. Failure to comply with applicable regulations can result in serious legal liability, fines, and health consequences.
Other listed materials-such as gypsum board, MDF, or vinyl flooring-may require removal due to water damage but are not inherently regulated hazardous materials under federal law. The WRT standard reinforces that compliance with environmental and occupational safety regulations is a non-negotiable component of professional restoration practice.
질문 # 91
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