Water damage course 1-45 Flashcards
What is the most important aspect to the beginning of a job?
Hazard/Risk assessment
Employers must provide training, a fit test, and a medical evaluation for employees who will be utilizing what equipment?
Respirator
True or False.
Often found in older structures, lead and asbestos are hazardous materials regulated by the Federal government.
True
Secondary damage is more likely to occur when relative humidity levels are
68%
What steps should be taken when working in an area with potential contamination
Wear proper PPE, contain the area
On a project with mold growth or Cat 3 water, an assessment could be completed by
An Indoor Environmental Professional (IEP)
What is secondary damage?
Damage from water or humidity over time
Water that has significant degree of contamination and could cause illness is which of these?
Category 2
To disengage a carpet from a tack strip properly, reducing potential delamination, we would use a
Knee kicker and carpet awl
Which of the following would be considered Category 1 water?
From a Sanitary Source
Water that is grossly contaminated is
Category 3
When should carpet cushion always be disposed of?
When affected by Category 2 or 3 water
Classes of water describe
The potential rate of evaporation (evaporation load)
A drying chamber that has water bound in materials such as plaster or hardwood resulting in low potential evaporation is a
Class 4
A drying chamber that has the least amount of area affected porous materials (less than 5%) of the combined walls, floors and ceiling materials is a
Class 1
A drying chamber that has the greatest amount of moisture, affecting porous materials (over 40%) of the combined walls, floors and ceiling materials is a
Class 3
Wearing PPE, obtaining owner approval, and having occupant and pets out of the structure applies to which of the following:
Applying antimicrobials to the structure
Water extracted from a jobsite should be?
Disposed of according to local laws
Which of the following would reduce microorganisms to a level considered safe by public health standards? (lowest amount of microbial reduction)
Sanitizer
If client stops removal of contaminated materials (e.g., cushion/pad on Category 2; carpet or drywall on a Category 3 job), what should the restorer do?
Stop work to prevent liability
Which of the following would eliminate microorganisms, and their spores?
Sterilizer
How do you measure for gallons of water?
(Length) X (Width) X (Depth of water) X 7.48 = Gallons of water.
(You convert the inches to decimal by dividing by 12. Example: 1”9 = 9 divided by 12= .75. so it is 1.75)
A moisture reading obtained from an unaffected material that allows the restorer to set drying goals for the affected structure
Dry standard
When is a drying job done?
A moisture meter indicates we have met our dry goal
Moisture sensors and IR Cameras are effective tools for
Quickly locating moisture in carpet
Once an area is identified with an infrared camera as a suspect of being wet, that area
must be verified with
A moisture meter or sensor
True or false? The moisture sensor can be used to verify our drying goal has been met
False
How would you check for elevated moisture under a tile floor, a vinyl floor, or behind vinyl wallpaper?
Use non-invasive moisture meter
Why do (IR) infrared cameras indicate possible moisture in materials?
Surfaces become cooler as water evaporates
What does a
thermo-hygrometer measure?
Temperature and relative humidity
How can a restorer document that drying goals were met?
Daily psychrometric and moisture readings
The amount of moisture in the air, as a percentage of the maximum amount the air could hold at a given temperature is known as which of these?
Relative Humidity
true or false.
Psychrometric conditions have a direct effect on the rate at which moisture moves within materials, as well as from wet materials.
True
What is the ratio of the weight of water vapor mixed with one pound of dry air called?
Humidity Ratio
To promote effective drying, restorers need to control
surface temperature, air temperature, vapor temperature.
A surface with a temperature at or below dew point results in what?
Condensation
Evaporation will increase when
Wet materials are made warmer
At dew point temperature (100% Relative Humidity) what happens?
Vapor changes to liquid
Providing dry airflow and increasing the temperature of wet materials (e.g. wood, wall cavities, carpet) the more energy is available for _____________ to occur.
Evaporation
If a drying chamber is 75 degrees and 40% RH, what is the humidity ratio?
52 gpp
What can happen when ducting airflow directly into walls, ceilings, or under cabinets?
More effective evaporation
What conditions could result in Secondary damage?
A greater rate of evaporation than dehumidification
A room has 847 square feet of wet floor and 329 square feet of wet walls/ceilings (wet walls below 2 feet have already been deducted). What range of air movers would be installed initially?
17 – 22
Refrigerant dehumidifiers remove moisture in the air through
Condensation
Since desiccant dehumidifiers do not remove water vapor through condensation, they are not limited by
Low Temperature
who is in charge of antimicrobials ?
(USEPA) United States environmental protection agency
what is the standard used for water damage?
ANSI/IICRC S500
What is the type of material used for class 4?
vapor pressure diffuser
AHAM refrigerants amount?
AHAM 80 F / 60% RH
