IICRC WRT Exam
Moisture levels of ______% will support destructive wood (rot) decaying fungi to grow on wood
surfaces.
20%
relative humidity
Is the ratio of the moisture suspended in air expressed as a percentage of total moisture holding
capaciry of that air at a given temperature.
ACM
Asbestos Containing Material
Daily Humidity Record
Occurring at least every 12-24 hours the recording the relative humidity and temperature to
determine Grains Per Pound (GPP).
Areas not directly wet will experience humidity elevation. Therefore...
Technicians must isolate affected areas from non affected areas to gain best control of humidity.
Vapor Pressure will always
...seek a level of equilibrium within a confined space.
How many grains are in a pound of air?
7000
Humidity ratio/specific humidity
The amount of water in the air (by weight) contained in the parcel of air.
, What is the goal for day 2 drying?
To get the humidity under 70 to ensure mitigation.
Dew point is also known as ___.
saturation temperature or condensation
The Dew Point
the temperature at which the air becomes saturated with water vapor (100%RH) and condenses
on the cooler surfaces.
Where does condensation moisture cause mold?
Mold growth can occur in cold spots of homes and buildings where warm indoor air encounters
cold outside air or vice versa.
Fog
When the air meets the dew point temperature.
Dew
The temperature at which condensation overwhelms evaporation.
Why might condensation be bad?
Condensation with a bio film (an organic film like soap or glue) present allows mold to grow in a
variety of surfaces from plastic to glass.
Biofilm
Any organic substrate and bacteria that tends to encourage mold growth.
Why are Thermal Cameras Important?
Thermal cameras, along with other sensors can detect the moisture perimeter of wet carpet
and cushion.
vapor pressure
A gaseous force exerted by the water vapor on its environment.
When does evaporation occur?
when vapor pressure of the ambient air (air in the room) is lower that the vapor pressure of the
wet material.
Moisture levels of ______% will support destructive wood (rot) decaying fungi to grow on wood
surfaces.
20%
relative humidity
Is the ratio of the moisture suspended in air expressed as a percentage of total moisture holding
capaciry of that air at a given temperature.
ACM
Asbestos Containing Material
Daily Humidity Record
Occurring at least every 12-24 hours the recording the relative humidity and temperature to
determine Grains Per Pound (GPP).
Areas not directly wet will experience humidity elevation. Therefore...
Technicians must isolate affected areas from non affected areas to gain best control of humidity.
Vapor Pressure will always
...seek a level of equilibrium within a confined space.
How many grains are in a pound of air?
7000
Humidity ratio/specific humidity
The amount of water in the air (by weight) contained in the parcel of air.
, What is the goal for day 2 drying?
To get the humidity under 70 to ensure mitigation.
Dew point is also known as ___.
saturation temperature or condensation
The Dew Point
the temperature at which the air becomes saturated with water vapor (100%RH) and condenses
on the cooler surfaces.
Where does condensation moisture cause mold?
Mold growth can occur in cold spots of homes and buildings where warm indoor air encounters
cold outside air or vice versa.
Fog
When the air meets the dew point temperature.
Dew
The temperature at which condensation overwhelms evaporation.
Why might condensation be bad?
Condensation with a bio film (an organic film like soap or glue) present allows mold to grow in a
variety of surfaces from plastic to glass.
Biofilm
Any organic substrate and bacteria that tends to encourage mold growth.
Why are Thermal Cameras Important?
Thermal cameras, along with other sensors can detect the moisture perimeter of wet carpet
and cushion.
vapor pressure
A gaseous force exerted by the water vapor on its environment.
When does evaporation occur?
when vapor pressure of the ambient air (air in the room) is lower that the vapor pressure of the
wet material.
