IICRC Applied Structural Drying | ASD Certification Exam
Air Filtration Device (ADF) Commonly called an air scrubber or negative air machine if airborne particles
need to be reduced, you could use an appropriately installed _______ ________
________
Air Filtration Device AFD
Assembly Construction Prior to determining the best drying system for affected materials, restorers
should identify and understand the assembly construction (ie wall assembly, floor
assembly)
Category 1 water originates from a sanitary source and does not pose substantial risk for
dermal, ingestion, inhalation, or exposure. Uncontaminated and routinely cleaned
Category 2 water contains significant contamination and has the potential to cause
discomfort or sickness if contacted or consumed by humans
Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other
harmful agents
Sewage Back Up Category 3
Clean water supply line Category 1
Class 1 Least amount of water absorption and evaporation load - Wet porous materials -
water loss is less then 5% of the area
Class 2 Significant amount of water absorption and evaporation load - water intrusion
where wet represents 5% - 40% of the area.
Class 3 greatest amount of water absorption and evaporation load. Water intrusion where
wet represents over 40% of the area
Class 4 deeply 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 Uses 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 Removes 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 uses 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
, IICRC Applied Structural Drying | ASD Certification Exam
Desiccant dehumidifier Removes 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 High humidity outside air could affect the drying climate adversely due to
______________
1. Tightness of the building envelope Favors that affect the detailed dehumidifier calculation is:
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density
Detailed Dehumidification Calculation See 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 The 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 Dry standard + (Dry standard x 10%) = ____________________
Why does demolition occur 1. 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
Useful for adjuster, or notes on xactimate line items
Recommendation Calculation Step 1: Install One air mover in each affected Room
Step 2: Add one air mover for every 50-70 square feet of affected wet floor in
each room
Step 3. Add one air mover for every 100 - 150 square feet of affected wet ceiling
and wall areas above approximately 24"
Step 4: Add one air mover for each wall inset and offset greater than 18"
Step 5: Total x - y
This is the __________ ___________ Recommendation Calculation
Refrigerants Dehumidification Recommendation Cubic Footage / Chart Factor (use IICRC chart) = Total PPD (pints per day)
Calculation
Number of Dehu Calculation Total PPD (pints per day) removal recommendation / dehumidifier AHAM rating =
_____ of ______ Calculation
Cubic Feet Per Minute Calculation Cubic Footage x Chart Factor (ACH) / 60 minutes = Total ______ ______ _____
_______ calculation
Total Number of Desiccant Dehumidifier Calculation Total CFM / Desiccant CFM Rating = Total ________of _________
____________ Calculation
Air Filtration Device (ADF) Commonly called an air scrubber or negative air machine if airborne particles
need to be reduced, you could use an appropriately installed _______ ________
________
Air Filtration Device AFD
Assembly Construction Prior to determining the best drying system for affected materials, restorers
should identify and understand the assembly construction (ie wall assembly, floor
assembly)
Category 1 water originates from a sanitary source and does not pose substantial risk for
dermal, ingestion, inhalation, or exposure. Uncontaminated and routinely cleaned
Category 2 water contains significant contamination and has the potential to cause
discomfort or sickness if contacted or consumed by humans
Category 3 water is grossly contaminated and can contain pathogenic, toxigenic, or other
harmful agents
Sewage Back Up Category 3
Clean water supply line Category 1
Class 1 Least amount of water absorption and evaporation load - Wet porous materials -
water loss is less then 5% of the area
Class 2 Significant amount of water absorption and evaporation load - water intrusion
where wet represents 5% - 40% of the area.
Class 3 greatest amount of water absorption and evaporation load. Water intrusion where
wet represents over 40% of the area
Class 4 deeply 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 Uses 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 Removes 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 uses 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
, IICRC Applied Structural Drying | ASD Certification Exam
Desiccant dehumidifier Removes 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 High humidity outside air could affect the drying climate adversely due to
______________
1. Tightness of the building envelope Favors that affect the detailed dehumidifier calculation is:
2. Prevailing weather
3. HVAC
4. Class of Water
5. Building Construction
5. Build out density
Detailed Dehumidification Calculation See 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 The 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 Dry standard + (Dry standard x 10%) = ____________________
Why does demolition occur 1. 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
Useful for adjuster, or notes on xactimate line items
Recommendation Calculation Step 1: Install One air mover in each affected Room
Step 2: Add one air mover for every 50-70 square feet of affected wet floor in
each room
Step 3. Add one air mover for every 100 - 150 square feet of affected wet ceiling
and wall areas above approximately 24"
Step 4: Add one air mover for each wall inset and offset greater than 18"
Step 5: Total x - y
This is the __________ ___________ Recommendation Calculation
Refrigerants Dehumidification Recommendation Cubic Footage / Chart Factor (use IICRC chart) = Total PPD (pints per day)
Calculation
Number of Dehu Calculation Total PPD (pints per day) removal recommendation / dehumidifier AHAM rating =
_____ of ______ Calculation
Cubic Feet Per Minute Calculation Cubic Footage x Chart Factor (ACH) / 60 minutes = Total ______ ______ _____
_______ calculation
Total Number of Desiccant Dehumidifier Calculation Total CFM / Desiccant CFM Rating = Total ________of _________
____________ Calculation
