IICRC Applied Structural Drying (ASD) Actual
Questions | 100% Correct Answers & Study Guide 2025
| Pass Guarantee
Air Filtration Device (ADF) - answerCommonly called an air scrubber or negative air
machine if airborne particles need to be reduced, you could use an appropriately
installed _______ ________ ________
Air Filtration Device - answerAFD
Assembly Construction - answerPrior to determining the best drying system for affected
materials, restorers should identify and understand the assembly construction (ie wall
assembly, floor assembly)
Category 1 - answerwater originates from a sanitary source and does not pose
substantial risk for dermal, ingestion, inhalation, or exposure. Uncontaminated and
routinely cleaned
Category 2 - answerwater contains significant contamination and has the potential to
cause discomfort or sickness if contacted or consumed by humans
Category 3 - answerwater is grossly contaminated and can contain pathogenic,
toxigenic, or other harmful agents
Sewage Back Up - answerCategory 3
Clean water supply line - answerCategory 1
Class 1 - answerLeast amount of water absorption and evaporation load - Wet porous
materials - water loss is less then 5% of the area
Class 2 - answersignificant amount of water absorption and evaporation load - water
intrusion where wet represents 5% - 40% of the area.
Class 3 - answergreatest amount of water absorption and evaporation load. Water
intrusion where wet represents over 40% of the area
Class 4 - answerdeeply held or bound water. Significant amount of water absorption into
low evaporation materials. Drying may require special drying methods, longer drying
time, or substantial water vapor pressure differentials.
Closed drying system - answerUses mechanical dehumidification and is not open to
outside air. Used if there are security issues, the outside air is not conductive to drying
or when access to outside air is not possible.
, Conventual refrigerant dehumidifier - answerRemoves water vapor from the air by
lowering the temperature of the incoming air to below dew point and causing the water
to condense on the coils. Cold and hot surfaces created with gases inside a closed coil
system.
Combination Drying System - answeruses some outdoor air with dehumidifiers to
accelerate the drying process. This can include periodically venting (flushing) the
structure, using negative pressure or using small openings to the outside
Desiccant dehumidifier - answerRemoves water vapor from the air through absorption.
Usually requires more amperage as compared to refrigerant dehumidifier. Desiccants
create the lowest vapor pressure which work best on low porosity materials. When a
desiccant dehu is drawing outside air and ducting processed air inside a building it can
create positive pressure in the building. To improve desiccant dehu performance, it may
be beneficial to pre-cool the desiccants air intake
Infiltration - answerHigh humidity outside air could affect the drying climate adversely
due to ______________
1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - answerFavors that affect the detailed dehumidifier calculation is:
Detailed Dehumidification Calculation - answersee Chart:
Cubic Feet : Divided by 70 = Base Pints per day
Multiply the 5 multipliers together: Build out density x building construction x class of
water x HVAC x Weather Impact = Multiplier
Multiply Base Pints per day x Multiplier = Adjusted Pints Per Day
Dry Standards - answerThe unaffected material readings are called ______ ______.
You know you can use this as your drying goal. Your drying goal is this plus 10% of it.
Drying Goal Calculation - answerDry standard + (Dry standard x 10%) =
____________________
Why does demolition occur - answer1. Removing Materials to eliminate safety hazards
2. Removing materials that have suffered primary damage and are not restorable
3. Removing porous materials that are holding odor
5. Removing vapor barriers to assist with drying efforts
6. Removing materials to reduce drying time
7. Removing materials to open cavities or areas to provide additional needed services
Questions | 100% Correct Answers & Study Guide 2025
| Pass Guarantee
Air Filtration Device (ADF) - answerCommonly called an air scrubber or negative air
machine if airborne particles need to be reduced, you could use an appropriately
installed _______ ________ ________
Air Filtration Device - answerAFD
Assembly Construction - answerPrior to determining the best drying system for affected
materials, restorers should identify and understand the assembly construction (ie wall
assembly, floor assembly)
Category 1 - answerwater originates from a sanitary source and does not pose
substantial risk for dermal, ingestion, inhalation, or exposure. Uncontaminated and
routinely cleaned
Category 2 - answerwater contains significant contamination and has the potential to
cause discomfort or sickness if contacted or consumed by humans
Category 3 - answerwater is grossly contaminated and can contain pathogenic,
toxigenic, or other harmful agents
Sewage Back Up - answerCategory 3
Clean water supply line - answerCategory 1
Class 1 - answerLeast amount of water absorption and evaporation load - Wet porous
materials - water loss is less then 5% of the area
Class 2 - answersignificant amount of water absorption and evaporation load - water
intrusion where wet represents 5% - 40% of the area.
Class 3 - answergreatest amount of water absorption and evaporation load. Water
intrusion where wet represents over 40% of the area
Class 4 - answerdeeply held or bound water. Significant amount of water absorption into
low evaporation materials. Drying may require special drying methods, longer drying
time, or substantial water vapor pressure differentials.
Closed drying system - answerUses mechanical dehumidification and is not open to
outside air. Used if there are security issues, the outside air is not conductive to drying
or when access to outside air is not possible.
, Conventual refrigerant dehumidifier - answerRemoves water vapor from the air by
lowering the temperature of the incoming air to below dew point and causing the water
to condense on the coils. Cold and hot surfaces created with gases inside a closed coil
system.
Combination Drying System - answeruses some outdoor air with dehumidifiers to
accelerate the drying process. This can include periodically venting (flushing) the
structure, using negative pressure or using small openings to the outside
Desiccant dehumidifier - answerRemoves water vapor from the air through absorption.
Usually requires more amperage as compared to refrigerant dehumidifier. Desiccants
create the lowest vapor pressure which work best on low porosity materials. When a
desiccant dehu is drawing outside air and ducting processed air inside a building it can
create positive pressure in the building. To improve desiccant dehu performance, it may
be beneficial to pre-cool the desiccants air intake
Infiltration - answerHigh humidity outside air could affect the drying climate adversely
due to ______________
1. Tightness of the building envelope
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density - answerFavors that affect the detailed dehumidifier calculation is:
Detailed Dehumidification Calculation - answersee Chart:
Cubic Feet : Divided by 70 = Base Pints per day
Multiply the 5 multipliers together: Build out density x building construction x class of
water x HVAC x Weather Impact = Multiplier
Multiply Base Pints per day x Multiplier = Adjusted Pints Per Day
Dry Standards - answerThe unaffected material readings are called ______ ______.
You know you can use this as your drying goal. Your drying goal is this plus 10% of it.
Drying Goal Calculation - answerDry standard + (Dry standard x 10%) =
____________________
Why does demolition occur - answer1. Removing Materials to eliminate safety hazards
2. Removing materials that have suffered primary damage and are not restorable
3. Removing porous materials that are holding odor
5. Removing vapor barriers to assist with drying efforts
6. Removing materials to reduce drying time
7. Removing materials to open cavities or areas to provide additional needed services
