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Water Damage Restoration: Questions and Answers for Professionals, Exams of Engineering

Wright State University (WSU) - DaytonEngineering

Infiltration Answer ✔✔When air comes into a structure through cracks or openings in a building, usually due to negative pressure. Exfiltration Answer ✔✔When air leaves a structure through cracks or openings in a building usually due to positive pressure. What is the significance of 30% moisture content? Answer ✔✔Can support wet rot in wood, as well as fiber saturation. To determine initial dehumidifier capacity recommendations, what must be known? Answer ✔✔Cubic feet, class of water, Dehumidifier type.

Typology: Exams

2023/2024

Available from 08/29/2024

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WRT Exam (2024/2025) | Actual Questions and Answers Latest Updated
2024/2025 (Graded A+)
Infiltration Answer ✔✔When air comes into a structure through cracks or openings in a building, usually
due to negative pressure.
Exfiltration Answer ✔✔When air leaves a structure through cracks or openings in a building usually due
to positive pressure.
What is the significance of 30% moisture content? Answer ✔✔Can support wet rot in wood, as well as
fiber saturation.
To determine initial dehumidifier capacity recommendations, what must be known? Answer ✔✔Cubic
feet, class of water, Dehumidifier type.
What two documents determine if evaporation and dehumidification are complete? Answer
✔✔Moisture map & daily humidity record.
What is HEPA? Answer ✔✔High Efficiency Particulate Air, 99.97% effective @ .3 microns
What is the significance of 16% moisture content? Answer ✔✔Can support mold growth in wood.
What are examples of Category 3 water? Answer ✔✔-Sewage
- Ground surface water, rivers/streams
- all flooding from sea water
- wind-driven rain, weather related events
- toilet backflows from beyond the P trap
What is the S-500? Answer ✔✔Standard of Care for the Water Restoration Industry
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Download Water Damage Restoration: Questions and Answers for Professionals and more Exams Engineering in PDF only on Docsity!

WRT Exam ( 2024 /2025) | Actual Questions and Answers Latest Updated

2024 /2025 (Graded A+)

Infiltration Answer ✔✔When air comes into a structure through cracks or openings in a building, usually due to negative pressure. Exfiltration Answer ✔✔When air leaves a structure through cracks or openings in a building usually due to positive pressure. What is the significance of 30% moisture content? Answer ✔✔Can support wet rot in wood, as well as fiber saturation. To determine initial dehumidifier capacity recommendations, what must be known? Answer ✔✔Cubic feet, class of water, Dehumidifier type. What two documents determine if evaporation and dehumidification are complete? Answer ✔✔Moisture map & daily humidity record. What is HEPA? Answer ✔✔High Efficiency Particulate Air, 99.97% effective @ .3 microns What is the significance of 16% moisture content? Answer ✔✔Can support mold growth in wood. What are examples of Category 3 water? Answer ✔✔-Sewage

  • Ground surface water, rivers/streams
  • all flooding from sea water
  • wind-driven rain, weather related events
  • toilet backflows from beyond the P trap What is the S-500? Answer ✔✔Standard of Care for the Water Restoration Industry

What does AHAM stand for? What are the test conditions? Answer ✔✔Association of Home Appliance Manufacturers Test Conditions are 80 degrees F / 60% relative humidity over a 24 hr. time period What are examples of Category 2 water? Answer ✔✔- flooding from dish washers/washing machines

  • broken aquariums
  • overflows from toilet on room side of P trap, some urine no feces What is the significance of 34 GPP? Answer ✔✔performance limit for low grain refrigerant dehumidifiers What are the principles of drying? Answer ✔✔-Remove excess (extraction)
  • Evaporation
  • Dehumidification
  • Temperature control (REDT) What is the definition of Vapor Pressure? Answer ✔✔pressure exerted by molecules of water vapor on surrounding surfaces. What are examples of Category 1 water? Answer ✔✔- falling rainwater
  • melting snow
  • flooding from tubs/sinks
  • broken water supply lines toilet bowls not containing contaminants
  • metal corner beads
  • metal framing
  • foil back insulation
  • plumbing behind drywall What does LCCC stand for? Answer ✔✔Limitations, Complexities, Conflicts, Complications Two considerations when determining to dry or replace insulation are...... Answer ✔✔- Category of water
  • Class of water What is the definition of Class 1 water? Answer ✔✔least amount of water absorption and evaporation load. Less than 5% of combined floor, ceiling, and wall surface in the space. What is the definition of Radiation? Answer ✔✔Transmission of heat through the invisible electromagnetic waves that pass from one object to another. What is the definition of evaporation? Answer ✔✔when a liquid is converted into a vapor. What temperature range do refrigerant dehumidifiers perform most efficiently? Answer ✔✔ 70 - 90 degrees F, sweet spot is 85-90 degrees F. What is the definition of Category 2 water? Answer ✔✔Significant contamination and has potential to cause discomfort and sickness. What is the definition of GPP? Answer ✔✔Grains Per Pound [ of dry air] GPP = Humidity Ratio

What does EMC stand for? Answer ✔✔Equilibrium moisture content The factors affecting evaporation are...... Answer ✔✔- Permeance

  • Air Flow
  • Temperature
  • Humidity (PATH) What is the definition of permeance? Answer ✔✔measurement of breathability of a material allowing water to diffuse (move) through a material. What is the definition of conduction? Answer ✔✔Transmission of heat through a material. What does MDF stand for? Answer ✔✔Medium Density Fiberboard What is the definition of Dew Point Temperature? Answer ✔✔temperature at which air can hold no more moisture. 100% relative humidity What is the definition of Category 3 water? Answer ✔✔Grossly contaminated and can contain pathogenic, toxigenic, or harmful agents and can cause severe adverse reactions. Which principle of drying will most effectively reduce drying time? Answer ✔✔Extraction Upon what principle do desiccant dehumidifiers work? Answer ✔✔chemical attraction, or sorption using silica gel.
  • Hard surface wand AKA vacuum squeegee What does OSB stand for? Answer ✔✔Oriented Strand Board What are the two types of drying techniques when using thermal energy? Answer ✔✔- Ambient Air Heating
  • Direct Heat Application What is the definition of a thermo hygrometer? Answer ✔✔device that at minimum measures temperature and relative humidity of the air. What does IEP stand for? Answer ✔✔Indoor Environmental Professional What does CFM stand for? Answer ✔✔cubic feet per minute What is the definition of Category 1 water? Answer ✔✔sanitary water source, does not pose substantial risk for dermal, ingestion, or inhalation exposure. What is the definition of sublimation? Answer ✔✔a chemical process where a solid turns into a gas without going through a liquid stage What is the definition of an open drying system? Answer ✔✔intentionally using outdoor air to lower indoor humidity, no use of mechanical dehumidification. What is the definition of a closed drying system? Answer ✔✔no use of exterior air, mechanical dehumidification only. What is the definition of disinfectant? Answer ✔✔inactivates pathogenic microorganisms, but not their spores. Effectively destroys 99.999% of target organisms, but NOT their spores.

What is the definition of class 4 water? Answer ✔✔Deeply bound or held water, with a significant amount of water absorption. What is the definition of class 3 water? Answer ✔✔greatest amount of water absorption and evaporation load. more than 40% of combined floor, wall, and ceiling surface in a space. What is the definition of class 2 water? Answer ✔✔significant amount of water absorption and evaporation load. 5 - 40% of combined floor, wall, and ceiling surface in a space. What is the definition of condensation? Answer ✔✔the process of a vapor changing to a liquid What is the definition of moisture level? Answer ✔✔measurement of amount of moisture contained in a material on a relative scale. This term is used when using an instrument that is not calibrated for that material. What is a combined drying system? Answer ✔✔Merges the benefits of dry exterior air and mechanical dehumidification. What is the definition of convection? Answer ✔✔the transfer of heat through the movement of liquids or gases What is the definition of a moisture meter? Answer ✔✔device that measures moisture content or level in a material.