WATER DAMAGE RESTORATION EXAMS SCRIPT
QUESTIONS AND ANSWERS GRADED A+
✔✔The most common safety concern at a water damage is: - ✔✔Slip, trip and fall
✔✔Wear your respirator: - ✔✔When dealing with organic vapors
When spraying solvents
When dealing with sewage or mold
✔✔What are the potentially poisonous toxins found in mold - ✔✔Mycotoxins
✔✔Psychrometry - ✔✔The study of *humidity, air flow and temp* and their effects on
property
✔✔Relative humidity - ✔✔Amount of moisture in the air expressed as a percentage of a
max air amount the air could contain at a specified temp
✔✔Air temperature - ✔✔Measured in dry bulb temp
✔✔Humidity ration (gpp) - ✔✔Actual weight of water vapor in the air
✔✔Vapor pressure (inches of mercury) - ✔✔The force exerted on the surrounding
environment due to the weight (pressure) of the water vapor in the air
✔✔Dew point (degrees Fahrenheit) - ✔✔The air temperature (capacity) is lowered to
the point that the Rh (relative humidity) equals 100% - air saturation point
✔✔Heat - ✔✔Thermal energy or energy, because it causes things (molecules) to move
✔✔Hydroscopic materials - ✔✔- Can be damaged by high water vapor (secondary
damage)
- easily absorb water, dry easily
- usually the first to become damaged
✔✔Potential for damage increases when the Rh (relative humidity) is above ______% -
✔✔70
✔✔Evaporation - ✔✔Changing from a liquid to a vapor
✔✔Boundary layer - ✔✔As water evaporates *the surface becomes cooler*
✔✔Sublimation - ✔✔Changing from the solid state to the vapor state without going
through the liquid state
, ✔✔Dehumidification - ✔✔Reducing the moisture content of the air
✔✔Balanced drying - ✔✔Achieved when the rate of evaporation is equal to or slightly
lower than the rate of dehumidification
✔✔Primary damages are a result of - ✔✔The water
✔✔Secondary damages are a result of - ✔✔High water vapor (humidity)
✔✔When can high amounts of water vapor occur - ✔✔When your rate of evaporation is
significantly higher than your rate of dehumidification
✔✔Saturation temperature/dew point - ✔✔Total saturation
The air can not hold any additional water
✔✔Permeance - ✔✔Ability of water vapor to pass through a material
✔✔Vapor barrier - ✔✔Materials that have a permeance factor of 1 or less
✔✔Dew point - ✔✔The temp at which water vapor begins to turn to a liquid
✔✔Relative humidity is the percent of moisture in the air at a given ________ -
✔✔Temperature
✔✔Humidity ratio is a better measure than relative humidity because it gives the
_______ weight of water per pound of dry air - ✔✔Actual
✔✔Nature always seeks ___________ - ✔✔Equilibrium
✔✔A vapor barrier typically has a permeance factor: - ✔✔Less than 1
✔✔The US humidity ratio is measured in: - ✔✔Grains per pound
✔✔If you know the relative humidity and the temp you can use a psychrometric chart to
determine - ✔✔Humidity ratio
Vapor pressure
Dew point temp
✔✔T/F all things equal, increasing air temp will lower relative humidity - ✔✔T
✔✔Materials which are highly prone to secondary damage cause by high humidity are
called? - ✔✔Hygroscopic
QUESTIONS AND ANSWERS GRADED A+
✔✔The most common safety concern at a water damage is: - ✔✔Slip, trip and fall
✔✔Wear your respirator: - ✔✔When dealing with organic vapors
When spraying solvents
When dealing with sewage or mold
✔✔What are the potentially poisonous toxins found in mold - ✔✔Mycotoxins
✔✔Psychrometry - ✔✔The study of *humidity, air flow and temp* and their effects on
property
✔✔Relative humidity - ✔✔Amount of moisture in the air expressed as a percentage of a
max air amount the air could contain at a specified temp
✔✔Air temperature - ✔✔Measured in dry bulb temp
✔✔Humidity ration (gpp) - ✔✔Actual weight of water vapor in the air
✔✔Vapor pressure (inches of mercury) - ✔✔The force exerted on the surrounding
environment due to the weight (pressure) of the water vapor in the air
✔✔Dew point (degrees Fahrenheit) - ✔✔The air temperature (capacity) is lowered to
the point that the Rh (relative humidity) equals 100% - air saturation point
✔✔Heat - ✔✔Thermal energy or energy, because it causes things (molecules) to move
✔✔Hydroscopic materials - ✔✔- Can be damaged by high water vapor (secondary
damage)
- easily absorb water, dry easily
- usually the first to become damaged
✔✔Potential for damage increases when the Rh (relative humidity) is above ______% -
✔✔70
✔✔Evaporation - ✔✔Changing from a liquid to a vapor
✔✔Boundary layer - ✔✔As water evaporates *the surface becomes cooler*
✔✔Sublimation - ✔✔Changing from the solid state to the vapor state without going
through the liquid state
, ✔✔Dehumidification - ✔✔Reducing the moisture content of the air
✔✔Balanced drying - ✔✔Achieved when the rate of evaporation is equal to or slightly
lower than the rate of dehumidification
✔✔Primary damages are a result of - ✔✔The water
✔✔Secondary damages are a result of - ✔✔High water vapor (humidity)
✔✔When can high amounts of water vapor occur - ✔✔When your rate of evaporation is
significantly higher than your rate of dehumidification
✔✔Saturation temperature/dew point - ✔✔Total saturation
The air can not hold any additional water
✔✔Permeance - ✔✔Ability of water vapor to pass through a material
✔✔Vapor barrier - ✔✔Materials that have a permeance factor of 1 or less
✔✔Dew point - ✔✔The temp at which water vapor begins to turn to a liquid
✔✔Relative humidity is the percent of moisture in the air at a given ________ -
✔✔Temperature
✔✔Humidity ratio is a better measure than relative humidity because it gives the
_______ weight of water per pound of dry air - ✔✔Actual
✔✔Nature always seeks ___________ - ✔✔Equilibrium
✔✔A vapor barrier typically has a permeance factor: - ✔✔Less than 1
✔✔The US humidity ratio is measured in: - ✔✔Grains per pound
✔✔If you know the relative humidity and the temp you can use a psychrometric chart to
determine - ✔✔Humidity ratio
Vapor pressure
Dew point temp
✔✔T/F all things equal, increasing air temp will lower relative humidity - ✔✔T
✔✔Materials which are highly prone to secondary damage cause by high humidity are
called? - ✔✔Hygroscopic
