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IICRC APPLIED STRUCTURAL DRYING
UPDATED EXAM QUESTIONS AND ANSWERS.
Air Filtration Device (ADF) - correct answer- 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 - correct answer- AFD Assembly Construction - correct answer- 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 - correct answer- water originates from a sanitary source and does not pose substantial risk for dermal, ingestion, inhalation, or exposure. Uncontaminated and routinely cleaned Category 2 - correct answer- water contains significant contamination and has the potential to cause discomfort or sickness if contacted or consumed by humans
Category 3 - correct answer- water is grossly contaminated and can contain pathogenic, toxigenic, or other harmful agents Sewage Back Up - correct answer- Category 3 Clean water supply line - correct answer- Category 1 Class 1 - correct answer- Least amount of water absorption and evaporation load - Wet porous materials - water loss is less then 5% of the area Class 2 - correct answer- Significant amount of water absorption and evaporation load - water intrusion where wet represents 5% - 40% of the area. Class 3 - correct answer- greatest amount of water absorption and evaporation load. Water intrusion where wet represents over 40% of the area
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 - correct answer- High humidity outside air could affect the drying climate adversely due to ______________
- Tightness of the building envelope
- Prevailing weather
- HVAC
- Class of Water
- Building Construction
- Build out density - correct answer- Favors that affect the detailed dehumidifier calculation is: Detailed Dehumidification Calculation - correct answer- 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 - correct answer- 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 - correct answer- Dry standard + (Dry standard x 10%) = ____________________ Why does demolition occur - correct answer- 1. Removing Materials to eliminate safety hazards
- Removing materials that have suffered primary damage and are not restorable
- Removing porous materials that are holding odor
- Removing vapor barriers to assist with drying efforts
- Removing materials to reduce drying time
- Removing materials to open cavities or areas to provide additional needed services Useful for adjuster, or notes on xactimate line items Recommendation Calculation - correct answer- Step 1: Install One air mover in each affected Room
Total Number of Desiccant Dehumidifier Calculation - correct answer- Total CFM / Desiccant CFM Rating = Total ________of _________ ____________ Calculation Drying goals may be at or above the dry standard should be documented as they relate to specific materials. The restorer should establish drying goals that would be expected to - correct answer- Return structure, systems or contents to an acceptable condition and inhibit microbial growth. Along with the above considerations where applicable, it is recommended the drying goal be within 10% of the dry standards. Establishing Drying Goals - correct answer- ___________ _____________ ______________ normally starts by measuring similar materials in an unaffected area of the building. These unaffected material readings are called a dry standard. A. 45 °F - best answer is always the lowest option - correct answer- If drying a crawlspace and the surface temperature of the wood framing is 80 °F what is the dew point temperature of the crawlspace air that would provide the greatest potential for evaporations A. 45 °F B. 65 °F
C. 85 °F
D. 105 °F
Dew Point - correct answer- A method to determine the effectiveness of the drying conditions is to measure the difference between the surface temperature of the materials and the ____________ ____________ of the air Temperature - correct answer- To decrease drying time of wet materials, restorers can increase the __________ of moisture in the materials. This accelerates the water molecules to make them move to the air. Tuesday - correct answer- The day with the greatest vapor pressure differential between air and material was Monday - Surface Vapor Pressure: .90 Air Vapor Pressure:. = Monday Vapor Pressure Differential:. Tuesday- Surface Vapor Pressure: 1.51 Air Vapor Pressure:. = Tuesday Vapor Pressure Differential:. Wednesday- Surface Vapor Pressure: 1.04 Air Vapor Pressure: .31 = Wednesday Vapor Pressure Differential:. Coldest Dew Point - correct answer- In the driest environments, we'll find _______?
Convection Conduction Radiation - correct answer- Heat flows from areas of warm temperatures to areas of cool temperature in the absence of other factors. The greater the temperature difference between warmer and cooler areas (temperature gradient) the faster the heat flows. Buildings lose or gain heat in three ways 1 ________
3 _______ Temperature Gradient - correct answer- Heat flows from areas of warm temperatures to areas of cool temperature in the absence of other factors. The greater the temperature difference between warmer and cooler areas (this is called _______________ __________________) the faster the heat flows. Evaporation - correct answer- When a surface's temperature is warmer than the dew point of the air space ____________ occurs, removing moisture from the surface.
Humidity Ratio - correct answer- ______________ __________________is the actual amount of moisture in the air. This amount is expressed in weight as the number of grains of moisture per point of dry air (gpp). The more moisture present in the air, the heavier the moisture will weight. GPP - correct answer- Humidity Ratio is the actual amount of moisture in the air. This amount is expressed in weight as the number of grains of moisture per point of dry air (this is the _________). The more moisture present in the air, the heavier the moisture will weight. Vapor Pressue - correct answer- ______________ __________________ is the pressure that all substances in a gaseous state exert on surrounding surfaces. the amount of pressure is determined by the concentration of gases, such as water vapor, in proportioned to the area in which it is contained Moisture moves - correct answer- from areas of high water vapor pressure to areas of low water vapor pressure seeking equilibrium Equilibrium - correct answer- Moisture moves from areas of high water vapor pressure to areas of low water vapor pressure seeking equilibrium
vapor pressure and lower _____________ ______________
Increases - correct answer- When the temperature of material is increased the vapor pressure of the liquid in the material
To Decrease Drying time of wet materials - correct answer- Restorers can increase the temperature of moisture in materials 7 - correct answer- If using LGRs, the water category is 3 and the cubic feet of the area is 280. What is the minimum initial dehumidifier AHAM rated performance pint capacity recommendation. (using the IICRC Initial Dehumidification Recommendation Calculation Sheet)
- Hallway : 70oz nylon, direct glue installation - correct answer- Which wet carpet floor covering would be the easiest to extract (Cat 1 | Class 1)
- Dining Room: 50oz loop-pile nylon with #8 bonded urethane cushion
- Living Room: 32oz cut-pile polypropylene with #6 bonded urethane cushion
- Hallway : 70oz nylon, direct glue installation
0.3 - correct answer- HEPA Filters are rated to remove ________% of particles down to ______ micron HEPA Filters are rated to remove - correct answer- 99.97% of particles down to 0.3 micron Regulations - correct answer- Identifying suspected hazards is a critical step in the inspection process. It is also required by safety and health ____________ Ground Conductor - correct answer- When using extension cords, you should ensure they contain a ____________
Air Filtration Devise - correct answer- If airborne particles need to be reduced, you could use an appropriately installed
IEP - correct answer- Indoor Environmental Professional Indoor Environmental Professional - correct answer- The IICRC (2003) states that "The role of an IEP is to perform an assessment of the fungal ecology of property, systems and contents at the job site, create a sampling strategy, sample the indoor environment, interpret laboratory data and determine Condition 1, 2 and 3 status for the purpose of establishing a scope of work (pre-remediation assessment) and/or when necessary to verify the return to normal fungal ecology. PPE - correct answer- personal protective equipment Cupping - correct answer- Water is trapped underneath and caused the flooring to do this Crowning - correct answer- The water is on the top of the flooring causing the flooring planks to do this BTU - correct answer- British thermal unit. The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.
Converting Grain Depression to PPD - correct answer- CFM of Dehu x Grain Depression / 71 = PPD AHAM - correct answer- The Association of Home Appliance Manufacturers. AHAM ratings - correct answer- 60% humidity and 80 degrees Fahrenheit to present a realistic picture of how equipment will perform in an "average" environment. Amps - correct answer- The amount of electricity (current) flowing in a circuit Volts - correct answer- The force of electricity flow in a circuit Watts - correct answer- The amount of electricity an electrical device uses when operating Power Consumption Formula - correct answer- Volts x amps x 24 hours = watts ÷ 1000 = kW x cost per kW @ day
Balanced drying - correct answer- ideal drying situation in which the rate of evaporation is equal to or slightly less than the rate of dehumidification or ventilation. Infiltration - correct answer- migration of air into and area from outside area due to high VP differential Permeance - correct answer- a measure of water flow through material(s) of specific thickness. Humidity, airflow and temperature (HAT) - correct answer- work together and when managed, enable achieving target time for drying influences movement toward equilibrium - wet seeks dry; hot seeks cold; high vapor pressure seeks low vapor pressure 20% 16% - correct answer- _____% rotting fungi growth IN wood _____% - non-rotting fungi growth ON wood 7.48 - correct answer- Gallons per cubic foot of water depth
80% - correct answer- _____% - available power to use per NEC per amperage in circuit 15 20 - correct answer- Residential v. commercial - generally, residential ______amp / commercial ______ amp (consider never using over 80% of available amperage) Moisture Sensor - correct answer- Senses moisture in materials over 17% MC; helps determine perimeter of water damage; unable to determine which layer is wet or when dry Thermo-hygrometer - correct answer- determines temperature / RH in all required atmospheric areas of inspection; helps determine open or closed drying system; further determines dehumidifier recommendations after initial placement Moisture meters - correct answer- invasive and non-invasive; determines moisture content; establish, monitor and determine when dry standards are met
