A detailed discussion of the definition of forensic engineering follows: “Forensic engineering is the application of engineering principals and methodologies to answer questions of fact. These questions of fact are usually associated with accidents, crimes, catastrophic events, degradation of property, and various types of failures,”1 and further, “Forensic engineering is the application of engineering principles, knowledge, skills, and methodologies to answer questions of fact that may have legal ramifications.”1 While this definition is applied to forensic engineering, it should be acknowledged that this field is practiced by not only engineers, but also other specialists involved with areas such as roofing system sciences, building envelope sciences, accident reconstruction, industrial hygiene (e.g., mold, bacteria, asbestos, and indoor air quality), and meteorology (rain, wind, snow, ice, hail, tornados, and hurricanes). Thus, the term forensic engineering in this book has been expanded to forensic engineering/sciences.