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IICRC WRT EXAM 2025 | ALL QUESTIONS AND CORRECT ANSWERS | GRADED A+ | NEWEST VERSION | VERIFIED ANSWERS
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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) --------
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? --------
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