Prep for the IICRC WRT Exam: Practice Tests, Flashcards & Study Modules
Learn psychrometry, Categories and Classes the way the WRT exam tests them — then prove it on a practice exam.
New to WRT? Start with the IICRC WRT certification guide.
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Free restoration tools
No login, no email. The same psychrometric math used on the job.
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Free Practice Questions
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Water Restoration Modules
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Flashcards for the WRT Exam
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Free Drying Calculators
What It Takes to Pass Your WRT — and Be Good at Water Damage Restoration
Most WRT training stops at passing the exam. This is what goes alongside a classroom WRT course or an IICRC WRT online course. Treat it as your IICRC WRT study guide: questions, drills, tools and modules that still make sense on your first water loss.
WRT Quick Reference
Common Water Restoration Questions, Answered
The concepts WRT candidates and working techs ask about most — categories, classes, drying math, and the field decisions that separate a clean job from a callback. Categories and Classes are defined in the ANSI/IICRC S500; our plain-English guide to the S500 explains the standard concept by concept.
Water Categories 1, 2 & 3
Category describes how contaminated the water is, from clean supply-line water through significantly contaminated discharge to heavily contaminated sewage and flood water. It drives PPE, whether porous materials come out, and how the file is written.
Read the Categories guideClass of Water Loss
Class describes evaporation load, not contamination — how much wet material there is and how readily it releases moisture. Low-permeance assemblies such as hardwood, plaster and masonry sit at the specialty end and change the drying plan.
Read the Classes guideAir Movers & Dehumidifier Sizing
Air movers sweep air across wet surfaces at a shallow angle, spaced around the perimeter and turned into corners, so the goal is coverage of wet material rather than machine count. Dehumidification is sized from the volume of the drying chamber and the load factor for the Class of loss, using rated capacity — undersizing is what leaves secondary damage behind after the equipment goes out.
Open the sizing calculatorPsychrometry & GPP
Grains per pound tells you how much moisture the air is actually carrying, which is what decides whether evaporation continues. Compare the chamber against unaffected air and against outside air before changing anything.
Open the GPP calculatorDocumentation that Holds Up
Daily moisture readings, photos of every affected area, equipment placed and removed, and a clear scope are what make a file defensible. The standard treats documentation as the basis for the restorer's decisions.
See what the credential expectsPassed WRT? Your next IICRC credential is AMRT.
WRT is the prerequisite for AMRT (Applied Microbial Remediation Technician) and ASD (Applied Structural Drying). AMRT is the mold and sewage credential, and our sister site runs the same free exam prep for it. For the drying credential, read about ASD certification.
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⚠️ WRTTraining.com is not affiliated with, endorsed by, or operated by the IICRC. This is independent exam preparation material only.