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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Principles of Water Damage Restoration | 20% | - Categories of water damage (Clean, Grey, Black) - IICRC S500 Standard overview - Classes of water loss (1–4) |
| Topic 2: Restoration Procedures | 20% | - Handling sanitary vs unsanitary water losses - Structural and material drying methods - Containment and contamination control - Extraction and removal of water |
| Topic 3: Effects of Water on Materials & Structures | 5% | - Impact on building materials, contents, assemblies - Determining restorable vs non-restorable items |
| Topic 4: Drying Science & Psychrometry | 25% | - Psychrometric principles: humidity, temperature, airflow - Equipment types: dehumidifiers, air movers, heaters - Evaporation, condensation, dehumidification |
| Topic 5: Health, Safety & Microorganisms | 15% | - Personal protective equipment (PPE) - Microorganisms: mold, bacteria, pathogens - Sanitization and disinfection standards - Hazard identification and control |
| Topic 6: Inspection, Assessment & Documentation | 15% | - Site inspection procedures - Moisture measurement and mapping - Documentation and reporting requirements |
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61. Frage
SCENARIO: Use the diagram and information below to answer this question.
. The living room measures 20 feet x 16 feet, with an offset measuring 10 feet x 2 feet.
. The ceiling height is 8 feet.
. The entire floor area is wet, and moisture has been detected as high as 21 inches on all walls except Wall A.
. Water escaped from a broken pipe located behind Wall A. The entire area of wall A is wet.
. The ceiling is not affected.
Important information:
. The total square footage of the floor, including the offset, is 340 square feet
. The total square footage of Wall A after deducting the bottom 2 feet is 120 square feet (USE THE SCENARIO) What is the total number of airmovers a restorer should install?
Antwort: B
Begründung:
Based on IICRC WRT initial air mover placement guidelines:
* Floor area:340 sq ft # typically1 air mover per 50-70 sq ft
* Low range # 5-7
* High range # 7-9
* Wall drying required:
* All walls affected up to 21 inchesexcept Wall A
* Wall A fully wet(above 2 ft deduction = 120 sq ft requiring full wall drying)
* Offsets and irregular geometryincrease airflow demand.
When combining:
* Floor drying requirement
* Additional air movers forsignificantly wet walls
* One fully saturated wall (Wall A)
* One offset area
62. Frage
Which drying system creates the lowest vapor pressure?
Antwort: B
Begründung:
The IICRC WRT body of knowledge identifiesdesiccant dehumidification systemsas capable of creating the lowest vapor pressurein a drying environment. Desiccant systems remove moisture through adsorption, allowing them to achieve extremely low humidity ratios and vapor pressures-lower than refrigerant-based systems can typically reach.
Because vapor pressure drives moisture movement, achieving very low air vapor pressure significantly increases the drying potential for dense or low-permeance materials. This is why desiccant systems are often specified for Class 4 drying, cold environments, or situations requiring aggressive moisture removal.
Heat-only systems increase vapor pressure unless paired with moisture removal. Inter-air systems enhance airflow but do not independently reduce vapor pressure. LGR dehumidifiers reduce vapor pressure effectively but not to the same extent as desiccants.
The WRT curriculum emphasizes that system selection must be based on drying objectives and material characteristics, with desiccants reserved for scenarios requiring maximum vapor pressure reduction.
63. Frage
When considering the use of outdoor air, which of the following conditions is the best?
Antwort: D
Begründung:
The IICRC WRT body of knowledge teaches that the suitability of outdoor air for ventilation drying depends onhumidity ratio, not relative humidity alone. The best outdoor air conditions are those with thelowest humidity ratio, allowing moisture to be removed from the indoor environment.
Among the options,70°F and 30% RHhas the lowest humidity ratio, making it the most effective for ventilation. Low humidity ratio air reduces indoor vapor pressure and supports evaporation without introducing excess moisture.
High relative humidity-even at cooler temperatures-often carries more moisture than drier warm air. The WRT manual cautions restorers against using outdoor air based solely on comfort perception. Psychrometric comparison is required.
Using inappropriate outdoor air can increase indoor moisture levels and slow drying. Therefore, option C represents the best condition under WRT principles.
64. Frage
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?
Antwort: D
Begründung:
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.
65. Frage
Which tool should be used to measure the moisture content of building materials?
Antwort: C
Begründung:
The IICRC WRT body of knowledge identifies themoisture meteras the primary instrument used to measure moisture content or moisture level in building materials. Moisture meters-either penetrating or non- penetrating-provide quantitative or comparative data necessary to establish drying goals and verify drying progress.
Thermo-hygrometers measure air conditions, thermal cameras identify temperature anomalies, and moisture sensors are typically qualitative indicators. Only moisture meters are designed to measure moisture within materials accurately and repeatably.
The WRT manual emphasizes selecting the appropriate meter type for the material being tested and documenting readings consistently. Proper moisture measurement is essential for defensible drying documentation and confirmation of project completion.
66. Frage
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