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IICRC WRT EXAM 2025 | ALL QUESTIONS AND
CORRECT ANSWERS | GRADED A+ | NEWEST
VERSION | VERIFIED ANSWERS
A warehouse that measures 35' x 40' x 10' has a class 4 loss, using a desiccant dehumidifier. How many CFM are required? (desiccant formula) - --------CORRECT ANSWER-----------------700: 35 x 40 x 10 = 14,00 cu ft. x 3 ACH (air changes per hour) / 60 = 42,000/60 = 700 cfm (cu ft per minute) To control particles in the air you could install... ---------CORRECT ANSWER-----------------An air filtration device (AFD) Carpet delamination can be caused by... ---------CORRECT ANSWER------- ----------Bending, folding, or improper removal from tack strip. Carpet seams should be cut... ---------CORRECT ANSWER----------------- Only as necessary To disengage a carpet from a tack strip properly, we would us a... --------- CORRECT ANSWER-----------------knee kicker and carpet awl Generally, to dry wood subfloor undr a vinyl floor, what should a restorer do? ---------CORRECT ANSWER-----------------Remove vinyl to dry the subfloor
A hardwood floor primarily absorbing moisture from the bottom and sides of the boards are higher than the center this is referred to as.. --------- CORRECT ANSWER-----------------cupping When a water loss occurs, the most important factor in minimizing damage is... ---------CORRECT ANSWER-----------------Rapid response to start mitigation procedures On a project with significant mold growth or category 3 water, an assessment could be completed by ---------CORRECT ANSWER-------------- ---An Indoor Environmental Professional (IEP) When applying an antimicrobial (biocide), restorers should... --------- CORRECT ANSWER-----------------Wear appropriate PPE and follow label directions, Have a customer briefing and provide them the SDS and sign an authorization form, and Have the homeowner and all pets vacate the premises. Which of the following would reduce microorganisms to a level considered safe by public health stadards? (lowest amount of reduction) --------- CORRECT ANSWER-----------------Sanitizer When should carper pad always be disposed ---------CORRECT ANSWER- ----------------When affected by Category 2 or 3 water
When should drying equipment be removed from a drying project? --------- CORRECT ANSWER-----------------When affected materials meet drying goals What happens when the vapor pressure of wet materials in increased? ----- ----CORRECT ANSWER-----------------Moisture evaporates if the ambient air has a lower vapor pressure. Why should air movers not be installed when microbial growth is found or suspected? ---------CORRECT ANSWER-----------------It can contaminate unaffected areas What is evaporation? ---------CORRECT ANSWER-----------------Changing water from a liquid to a vapor (gas) What do you need to know to determine the initial dehumidification? --------- CORRECT ANSWER-----------------cubic footage, class of loss, and type of dehumidifier What is secondary damage? ---------CORRECT ANSWER----------------- Damage from humidity being absorbed by materials and contents What is vapor pressure? ---------CORRECT ANSWER-----------------Force from water molecules in the air on surrounding surfaces
In what scenario is evaporation going to occur? ---------CORRECT ANSWER-----------------When the vapor pressure of the air is lower than the vapor pressure of affected materials What steps should be taken when contamination (category 2 or 3, or mold) is discovered? ---------CORRECT ANSWER-----------------If working in the area, wear proper PPE, contain the area and contact materially interested partie The most important aspect to any job is: ---------CORRECT ANSWER-------- ---------Risk/Hazard assessment for the safety of all individuals involved Safety in water damage restoration includes: ---------CORRECT ANSWER-- ---------------Engineering controls, Immunizations from a Primary care physician, and PPE Employers must provide which of the following to any employee working in a repirator: ---------CORRECT ANSWER-----------------Medical evaluation, Fit test, and training Water damage mitigation services do not start until ---------CORRECT ANSWER-----------------A work authorization (contract) has been signed During the initial inspection when looking for areas impacted by water damage: ---------CORRECT ANSWER-----------------Check all areas that could potentially be affected
Secondary damage are more likely to occur when relative humidity levels are: ---------CORRECT ANSWER-----------------55% Performing a thorough extraction or multiple extractions.... --------- CORRECT ANSWER-----------------Reduces drying times Water extracted from a jobsite should be... ---------CORRECT ANSWER----- ------------Disposed of according to local laws In a basement that measures 25' x 30' and has water standing at a depth of 9", how many gallons total are there? ---------CORRECT ANSWER------------ -----4,208 gallons 25 x 30 x (9/12 = 0.75) x 7. In a crawlspace that measures 12' x 15' and has water standing at a depth of 5'3", how many total gallons of water is there? ---------CORRECT ANSWER-----------------12 x 15 x (5'3" = 5 3/12 = 5.25) x 7.481= 7, gallons A moisture reading obtained from an unaffected material that allows the restorer to set drying goals for the affected structure is the___ --------- CORRECT ANSWER-----------------Dry standard When is a drying job done? ---------CORRECT ANSWER-----------------A moisture meeter indicates we have met our dry goal
The moisture sensor can be used to verify our drying goal has been met (True or False) ---------CORRECT ANSWER-----------------False Moisture sensors and IR cameras are effective tools for: ---------CORRECT ANSWER-----------------quickly locating moisture in carpet and pad and establishing a wet perimeter. What does a thermo-hygrometer measure? ---------CORRECT ANSWER---- -------------Temperature and relative humidity When do (IR) infrared cameras indicate possible moisture in materials? ----- ----CORRECT ANSWER-----------------Materials surface temperature cools as water evaporates. Moisture in materials can cause temperature variations due to differences in thermal conductivity. once an area is identified with an infrared camera as a suspect of being wet, that area must be verified with: ---------CORRECT ANSWER-------------- ---A moisture meter or sensor Psychrometric conditions have a direct effect on the rate at which moisture moves within materials, as well as from wet materials. (True or false) --------
- CORRECT ANSWER-----------------True What are the three things restorers can manipulate to promote drying? (sometimes called the drying pie) ---------CORRECT ANSWER----------------- Humidity, Airflow, and Temperature
At dew point temperature.. ---------CORRECT ANSWER-----------------Vapor changes to a liquid The movement of water vapor through a material is caused by.. --------- CORRECT ANSWER-----------------vapor pressure differentials The greater the temperature of wet materials, the more energy is available for __________ to occur. ---------CORRECT ANSWER--------------- --Evaporation If a drying chamber is 75 degrees and 40% RH, what is the humidity ratio? (use psychrometric chart) ---------CORRECT ANSWER-----------------52 gpp (grains of moisture per pound of dry air) If a drying chamber is 68 degrees and 70% RH, what is the humidity ratio? (use psychometric chart) ---------CORRECT ANSWER-----------------72 gpp (grains of moisture per pound of dry air) If a drying chamber is 70 degrees and 60 gpp, what is the RH? (use psychometric chart) ---------CORRECT ANSWER-----------------55% If the exterior is 42 degrees and 30% RH, what is the humidity ratio? (use psychometric chart) ---------CORRECT ANSWER-----------------12 gpp (grains of moisture per pound of dry air)
If a drying chamber is 32% RH and 60gpp, what is the temperature? (use psychometric chart) ---------CORRECT ANSWER-----------------87 degrees What is the relative humidity if the dew point temperature is 35 degrees and the dry bulb temperature is 70 degrees (use psychometric chart) --------- CORRECT ANSWER-----------------28% A material that is very weakened when wet, but, if dried properly, regains its original strength is... ---------CORRECT ANSWER-----------------Gypsum (drywall, wallboard, sheetrock) The ability for water vapor to move through materials is known as... --------- CORRECT ANSWER-----------------permeability Classes of water describe ---------CORRECT ANSWER-----------------The potential rate of evaporation (evaporation load) A drying chamber that has the least amount of area affected (less than 5%) of the combined walls, floors and ceiliing material is ... ---------CORRECT ANSWER-----------------class 1 A class 2 loss is a drying chamber that has a significant amount of moisture affecting ____________ of the combined walls, floors and ceiling materials. ---------CORRECT ANSWER-----------------5% - 40%
Refrigerant dehumidifiers are rated for water removal in ... --------- CORRECT ANSWER-----------------pints per day (ppd) Desiccant dehumidifiers remove moisture from the air through principle of ... ---------CORRECT ANSWER-----------------absorption Since desiccant dehumidifiers do not remove water vapor through condensations, they are not limited by... ---------CORRECT ANSWER-------- ---------temperature In an area that measures 15,000 cubic feet, what is the initial AHAM requirement for a Class 2 loss, using an LGR (refrigerant) dehumidifier? (use factor chart) ---------CORRECT ANSWER-----------------15,000 cu ft / 50 = 300 ppd pints per day A class 3 loss that measures 15' x 35' and has a ceiling height of 9', how many 100-pint LGRs are needed? (refrigerant formula) ---------CORRECT ANSWER-----------------2: (15 x 30 x 9 = 4050 cu ft/40 (from chart) = 118 pints per day. we need 2 because our LGR only does 100ppd. Which of the following would be considered Category 1 water? --------- CORRECT ANSWER-----------------A sink overflow with water that does not pose substantial risk
What additional steps may be needed after drying a hardwood floor? --------
- CORRECT ANSWER-----------------Time to acclimate, sanding, and refinishing What happens when temperature decreases? ---------CORRECT ANSWER-----------------Relative humidity increases: To illustrate this, let's consider an example: Suppose you have a room with a fixed amount of water vapor in the air. As the temperature decreases, the air's capacity to hold water vapor decreases, and at some point, the air becomes saturated. Saturation occurs when the air reaches 100% relative humidity, meaning it cannot hold any more moisture at that temperature. Any further decrease in temperature will cause the excess moisture to condense out as dew or frost. If cellulosic insulation is affected, what should be done? ---------CORRECT ANSWER-----------------Typically remove the insulation and dry the structure. Why are desiccant dehumidifiers typically used in Class 4 losses? --------- CORRECT ANSWER-----------------They create the lowest vapor pressure of any type of dehumidifier. What is the primary function of a dehumidifier? ---------CORRECT ANSWER-----------------Remove water vapor from the air If thermal energy is added to affected materials then..... ---------CORRECT ANSWER-----------------Evaporation increases
If plywood is affected by water damage it ..... ---------CORRECT ANSWER-- ---------------It is typically resistant to water damage and can be restored if dried properly Which of the following is a vapor retarding material? OSB Drywall Concrete or Vinyl - --------CORRECT ANSWER-----------------Vinyl Why are LGR's generally more efficient than a conventional regrigerant? --- ------CORRECT ANSWER-----------------They create lower vapor preasure Which of the following would eliminate all microorganisms, but not their spores? ---------CORRECT ANSWER-----------------Disinfectant
