IICRC WRT Questions and Answers Updated 2026/2027 Version | Verified Answers

IICRC WRT Questions and Answers Updated 2026/2027 Version | Verified Answers 1. Water vapor pressure always seeks - ANSWER Equilibrium 2. If vapor pressure in ambient air is lower than the vapor pressure in wet materials the outcome will be - ANSWER condensation 3. Blowing air into wall cavities helps them dry by enhancing the rate of - ANSWER evaporation 4. the temp at which humidity in the air reaches saturation (100% RH) is ________ ________ _________ - ANSWER dew point temp 5. Maintaining a surface temp above ____ ____ will allow evaporation to occur - ANSWER Dew Point 6. ___________________________ is the process of changing liquid too a vapor - ANSWER evaporation 7. when air is holding the maximum amount of water vapor possible at a given temperature, the air is _____________ - ANSWER Saturated 8. the temp of affected areas and the ____________ of wet materials significantly impacts the rate of evaporation - ANSWER temp 9. the greater the temp of wet materials, the more ______ is available for evaporation to occur - ANSWER energy 10. Adding ______ (heat) to materials promotes drying - ANSWER Energy 11. Increasing the temp of wet materials or assemblies , which in turn increases the material's _________ ___________, can be done through many systems, including the application of direct heat. - ANSWER vapor pressure 12. an _____ drying system utilizes outdoor air to reduce indoor humidity. - ANSWER OPEN 13. ______ drying systems are always employed when outdoor humidity levels are higher than indoors. - ANSWER Closed 14. Moisture readings should be recorded at least __________ - ANSWER daily 15. Aire movers should be equipped with a __________ plug - ANSWER 3 prong or grounded 16. A water loss happened in an office affecting the entire floor (140sf). All walls are affected only 6 inches up. There is one offset in the room greater than 18 INCHES. How many air movers should be placed initially? - ANSWER 4-5 17. I airflow is allowed to exceed dehumidification then ____________ damage can occur due to uncontrolled humidity. - ANSWER Secondary 18. _________ __________ ___________ are used to remove airborne contaminents. - ANSWER Air Filtration Devices (AFD) 19. ___________are used to remove moisture (water vapor) from the air) - ANSWER dehumidifiers 20. Refrigerant dehumidifiers remove moisture from the air through the process of - ANSWER condensation 21. Optimal performance range for refrigerants in between - ANSWER 70-90 degrees F 22. A low grain refrigerant (LGR) dehumidifier reduces vapor pressure below a _____________ refrigerant. - ANSWER conventional 23. Which type of dehumidifier produces the lowest vapor pressure air? - ANSWER Desiccant 24. The most effective dehumidifier to use when drying a cold, wet crawlspace would be a _______ - ANSWER Desiccant 25. When using an LGR dehu in a class 3 water intrusion containing 17,000 ft cubed, the initial water removal recommended is _______ PPD - ANSWER 425 PPD 26. when using an LGR that removed 130 pints per day (PPD) at AHAM test conditions, the recommended number of dehus initially on a class 2 water intrusion with 35,000 ft cubed is _______ - ANSWER 6 27. When using a desiccant dehu that is rated to process 400 cfm, the initial recommended number on a class 4 water intrusion in a 5,000 sqft building with 8 foot ceiling height is ______ - ANSWER 1 28. A _________ is a diagram of the affected area showing extent of water migration. - ANSWER Moisture Map 29. Circulating air where contamination is present can increase the likelihood of contaminating ______________ areas. - ANSWER Unaffected 30. Before applying biocides, restorers should advise customers to ________ the structure for the period of time during and after application. - ANSWER vacate 31. Products used to reduce, but not necessarily eliminate, microorganisms to levels considered safe as determined by public health codes or regulations: - ANSWER Sanitizers 32. Products that kill or inactivate at least 99% of disease-producing (pathogenic) microorganisms on inanimate objects but not necessarily their spores: - ANSWER Disinfectants 33. When applying biocides or antimicrobials techs SHALL follow the - ANSWER label instructions for proper application