IICRC WRT 2026 – 40 Exam Questions & Answers on Humidity, Dew Point, Dehumidification | Water Restoration Technician Certification

This document provides a comprehensive collection of approximately 40 exam-style questions and verified answers focused on core principles of water damage restoration. It covers critical topics such as relative humidity, vapor pressure, evaporation, dew point, condensation, dehumidification systems, and drying goals, giving both theoretical explanations and practical applications used in restoration projects. In addition, the material explores key industry standards such as maintaining humidity below 70% within the first 24–48 hours, understanding grains per pound (GPP), and optimizing drying efficiency through temperature, airflow, and moisture control. Concepts like hygroscopic materials, thermal imaging for moisture detection, and differences between conventional and LGR dehumidifiers are also thoroughly addressed, making this a complete preparation resource. The content aligns closely with the IICRC Water Restoration Technician (WRT) certification and is strongly connected to the standard reference textbook IICRC S500: Standard and Reference Guide for Professional Water Damage Restoration, which forms the foundation of the concepts explained in this document. This document is particularly useful for students and professionals in courses such as Water Restoration Technician (WRT), Environmental Health and Safety, Building Science, HVAC and Indoor Air Quality, and Disaster Restoration programs. It is suitable for certification candidates, restoration technicians in training, construction and property maintenance students, and professionals seeking to strengthen their understanding of moisture control and drying science. Keywords: water damage restoration, relative humidity, dew point, vapor pressure, evaporation, dehumidification, hygroscopic materials, moisture content, drying goals, GPP, thermal imaging, condensation, LGR dehumidifier, ASHRAE standards, closed drying system