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| Section | Objectives |
|---|---|
| Heating, Ventilating, and Air Conditioning (HVAC) Restoration | |
| Limitations, Complexities, Complications, and Conflicts | |
| Specialized Experts | |
| Administrative Procedures, Project Documentation, and Risk Management | |
| Safety | - Immunizations - Water Damage specific hazards - Equipment Safety - Identifying potential on-the-job hazards - Personal Protective Equipment (PPE) |
| Building and Material Science | - Psychrometry and Drying Technology - Equipment, Instruments, and Tools |
| Contents Evaluation, Restoration, and Remediation | |
| Water Damage Mitigation | - Stopping secondary damage - Protecting structure, furniture and other contents - Locating the source of water |
| Antimicrobial (biocide) Technology | |
| Structural Restoration | |
| Principles of Water Damage Restoration | - Microbiology of Water Damage - Health Effects from Exposure to Microbial Contamination in Water-Damaged Buildings |
| Safety and Health | |
| Developing a Scope | - Determining migration of water - Evaluating class of water loss - What's wet? - Building materials: Carpet, pad, flooring, sub-flooring, framing, drywall etc. - Drying methods - Determine a dry standard and a dry goal - Evaluating category of water loss |
| Inspections, Preliminary Determinations, and Pre-Restoration Evaluations | |
| Materials and Assemblies | |
| Large or Catastrophic Restoration Projects |
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NEW QUESTION # 35
When using LGR dehumidifiers in a Class 3 water intrusion containing 9,000 cubic feet, what is the recommended dehumidification capacity?
Answer: C
Explanation:
The IICRC WRT body of knowledge provides guidance for initial LGR dehumidification capacity based on cubic footage and class of water. For Class 3 intrusions, which involve the greatest amount of moisture absorption and evaporation (excluding Class 4), a higher dehumidification capacity is required.
A commonly taught WRT guideline is approximately one LGR dehumidifier (#150 PPD) per 3,000 cubic feet for Class 3 conditions. Applying this to a 9,000 cubic foot drying chamber results in a total recommended capacity of approximately 450 PPD.
This capacity ensures that evaporated moisture is removed efficiently, preventing elevated humidity and secondary damage. The WRT curriculum emphasizes that insufficient dehumidification in Class 3 losses can stall drying and increase microbial risk.
As with all equipment recommendations, this is an initial placement subject to adjustment based on monitoring data, but 450 PPD represents the correct starting capacity under WRT guidance.
NEW QUESTION # 36
Which material loses most of its structural integrity when wet but regains its strength when dry?
Answer: C
Explanation:
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.
NEW QUESTION # 37
As the humidity ratio and dew point increase or decrease, what other psychrometric measurement also increases or decreases proportionally?
Answer: D
Explanation:
The IICRC WRT body of knowledge explains thathumidity ratio, dew point, and vapor pressure are directly related psychrometric measurements. When humidity ratio increases or decreases, both dew point and vapor pressure change proportionally.
Vapor pressure represents the energy exerted by water vapor molecules in the air. As more moisture is added to the air (higher humidity ratio), vapor pressure increases; when moisture is removed, vapor pressure decreases. Dew point follows the same pattern because it reflects the temperature at which that vapor pressure results in saturation.
Temperature and permeability are not directly proportional to humidity ratio, and dehumidification rate is a performance outcome rather than a psychrometric property.
Because vapor pressure governs moisture movement between materials and air, its proportional relationship to humidity ratio and dew point makes it one of the most important measurements in WRT drying science.
NEW QUESTION # 38
Which material should be discarded when affected by Category 2 water?
Answer: B
Explanation:
The IICRC WRT body of knowledge clearly states thatcarpet cushion (pad, underlay)must be discarded when affected byCategory 2 water. Cushion is a porous material that readily absorbs contaminants and cannot be effectively cleaned or disinfected once exposed to water containing significant contamination.
The WRT manual explains that while some materials may be dried or cleaned depending on conditions, carpet cushion presents a high risk of retaining microorganisms, nutrients, and odors. Retaining contaminated cushion increases the likelihood of secondary damage and occupant exposure.
Wood framing and plywood subfloors may be restorable depending on contamination duration and extent, and oriental rugs require specialized evaluation. Category 2 contamination alone is sufficient justification for cushion removal under WRT standards.
NEW QUESTION # 39
In a home with a Class 2 intrusion, where the floor is 1,300 square feet with an 8-foot ceiling, what is the initial recommended Pints Per Day (PPD) if using LGR dehumidifiers?
Answer: A
Explanation:
The IICRC WRT body of knowledge teaches that initial dehumidification capacity for LGR dehumidifiers is based oncubic footage and class of water intrusion. Class 2 intrusions involve a larger amount of moisture absorption than Class 1 but do not reach the full saturation of Class 3.
First, calculate the affected volume:
1,300 sq ft ร 8 ft =10,400 cubic feet.
ForClass 2 losses, a commonly accepted WRT guideline is approximatelyone LGR dehumidifier (#200-210 PPD)per10,000-12,000 cubic feet. This capacity balances evaporation demand without over-drying or inefficiency.
A recommendation of 208 PPD aligns directly with this guidance and reflects standard WRT training tables used for initial equipment placement. Lower values (26 or 99 PPD) are insufficient for the moisture load, while 303 PPD exceeds the initial requirement for a Class 2 loss and would require justification through monitoring data.
The WRT manual emphasizes that this is aninitial recommendationand must be validated by daily psychrometric and material moisture monitoring. Equipment may be adjusted as drying progresses.
NEW QUESTION # 40
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