Podcast Beta
Questions and Answers
What factors influence drying capacity during restoration procedures?
Which class of water has the greatest potential for evaporation due to high absorption?
What is the term for water originating from a sanitary source with low risk to humans?
Which class of water intrusion is characterized by wet porous materials representing ~5% to less than ~40% of the affected area?
Signup and view all the answers
What is a requirement for employees under the Company Protection Plan before using respirators?
Signup and view all the answers
How often should monitoring to document and adjust drying goals be performed?
Signup and view all the answers
Which type of carpet installation is best extracted with a 'light wand'?
Signup and view all the answers
What two documents are essential to determine the completion of evaporation and dehumidification?
Signup and view all the answers
What are the recommended calculations after installing one airmover in each affected area?
Signup and view all the answers
When rounding calculations that end with a partial room, which direction should the rounding occur?
Signup and view all the answers
What can quickly cause airmovers to overheat and decrease cfm/air movement?
Signup and view all the answers
Which four items greatly influence the rate of evaporation (correct evaporation PATH)?
Signup and view all the answers
Upon what principle do refrigerant dehumidifiers operate?
Signup and view all the answers
What temperature range are refrigerant dehumidifiers rated most efficient?
Signup and view all the answers
Which type of dehumidifier creates the greatest difference in Vapor Pressure?
Signup and view all the answers
Which drying technique involves using thermal energy?
Signup and view all the answers
What term describes the amount of moisture in a given volume of air, expressed as a percentage of the total amount it could hold at a given temperature?
Signup and view all the answers
What is the process of changing a solid directly to a gas, often used in freeze-drying?
Signup and view all the answers
What effect does increasing room temperature have on evaporation rates?
Signup and view all the answers
At what relative humidity percent do microbial concerns typically become major?
Signup and view all the answers
What is a force exerted in a gas state on a surrounding surface known as?
Signup and view all the answers
What is the relative humidity percent at dew point temperature?
Signup and view all the answers
What humidity level is moisture always trying to reach without exceeding?
Signup and view all the answers
What term describes the weight of moisture held in air?
Signup and view all the answers
Which principle of drying is most effective in reducing drying time?
Signup and view all the answers
What tool is used to safely extract water from hard surfaces without damaging finished flooring?
Signup and view all the answers
How is the formula to compute gallons of standing water written?
Signup and view all the answers
What is the approximate number of gallons in a basement measuring 22 ft. x 22 ft. flooded with 3 ft. 3 inches of water?
Signup and view all the answers
Which two tools are used to relieve tension on carpet while disengaging from tackstrip?
Signup and view all the answers
What is the easiest carpet installation process to extract if it is glue-down or installed over cushion?
Signup and view all the answers
Which government regulatory agency dictates employee health and safety in the workplace?
Signup and view all the answers
Which relative humidity level will reduce the performance of a low grain refrigerant (LGR) dehumidifier?
Signup and view all the answers
What is the primary purpose of a moisture sensor?
Signup and view all the answers
Which equipment conditions does a thermo-hygrometer help determine?
Signup and view all the answers
What type of meter provides relative readings and is not calibrated for moisture content?
Signup and view all the answers
What measurement is represented by CFM?
Signup and view all the answers
When should carpet cushion be removed in in-place drying for Category 1?
Signup and view all the answers
How can false positive readings be created when using non-penetrating meters?
Signup and view all the answers
Which method is used to check behind trim molding with penetrating meters?
Signup and view all the answers
What units represent FPM in airflow measurements?
Signup and view all the answers
Study Notes
Water Damage Restoration - Determining Category and Class
- Water damage restoration procedures may vary depending on the class of water damage.
- Factors to estimate drying capacity include:
- HVAC and outdoor weather influence
- Build-out density
- Building construction complexity
Water Categories and Classes - Key Facts
-
Category 1: Sanitary water source, posing minimal risk to humans.
-
Category 2: Contaminated water, potentially causing discomfort or sickness.
-
Category 3: Significantly contaminated water, posing a serious health risk.
-
Class 1: Small area of water intrusion (less than 5% of floor, wall, and ceiling area combined) with minimal evaporation potential, due to limited material absorption.
-
Class 2: Moderate area of water intrusion (5% to 40% of floor, wall, and ceiling area combined). Moderate amount of evaporation potential, due to moderate material absorption.
-
Class 3: Significant area of water intrusion (more than 40% of floor, wall, and ceiling area combined). Maximum amount of evaporation potential, due to high material absorption.
-
Class 4: Limited evaporation potential, due to deeper saturation and low permeance materials.
Drying Process and Equipment
- Four principles of successful drying: Removal, Evaporation, Dehumidification, Time.
- Tools for safely extracting water from hard surfaces:
- Wet vacuum, also known as a squeegee vacuum.
- Tools for relieving tension during carpet extraction:
- Carpet stretcher
- Knee kicker.
- Light wands are best for extracting water from carpets with certain installations.
- Air movers should be placed in each affected area and in rooms adjacent.
- LGR (Low grain refrigerant) dehumidifiers operate best in the temperature range of 85 - 90°F.
Dehumidifier Types and Specifications
- Conventional Refrigerant Dehumidifier: Average performance, typically around a relative humidity (RH) of 40%.
- Low Grain Refrigerant (LGR) Dehumidifier: Higher performance, typically around a RH of 30%.
- Desiccant Dehumidifier: Highest performance, capable of reaching below 10% RH.
Dehumidifier Capacity: Calculations and Monitoring
- AHAM (Association of Home Appliance Manufacturers) ratings for dehumidifiers are based on a specific temperature and RH.
- Grain Depression (GD) and cfm (cubic feet per minute) of dehumidifiers are necessary for determining estimated water removal.
- Evaporation rate is influenced by Permeance, Area, Temperature, and Humidity Ratio (gpp).
- Refrigerant dehumidifiers work by extracting moisture, cooling air, then warming it back up to return to the environment.
- Desiccant dehumidifiers work by using silica gel to absorb moisture.
Thermal Energy in Drying
- The two types of thermal energy techniques are Forced Air Heating and Radiant Heating.
- Ventilation is recommended when using thermal energy applications to increase the rate of evaporation.
Inspection Tools and Measurements
- Moisture sensors detect moisture levels, but have limited accuracy and do not show moisture content.
- Anemometers measure air flow in terms of cfm (cubic feet per minute) and fpm (feet per minute).
- Penetrating meters can be used to check for moisture through electrical conductivity.
- Non-penetrating meters provide relative moisture readings, but can also give false positives.
- Moisture content should be taken at various locations within the affected area.
- LCCC stands for Local Code, City Code, County Code, and Corporate Code.
Psychrometry
- Relative humidity is the amount of moisture in the air expressed as a percentage of what the air can hold at a certain temperature.
- Humidity Ratio, also known as gpp (grains per pound), describes the weight of moisture held in air.
- Vapor pressure is increased or decreased when the Humidity Ratio (gpp) is increased or decreased, respectively.
- Dew point is “the temperature at which air becomes saturated and condensation then begins on any surface colder than this temperature**.
- Evaporation is the process of a liquid turning into a gas.
- Sublimation is the process of a solid directly turning into a gas.
- Capillary action (wicking): Water moving through porous materials due to surface tension.
- Vapor Diffusion: The movement of water vapor from a high-pressure area to a low-pressure area.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores the key concepts of water damage restoration, focusing on the different categories and classes of water damage. Understand the distinctions between Category 1, 2, and 3, as well as the implications of Class 1, 2, and 3 for restoration processes. Test your knowledge on how various factors influence restoration procedures.
