Book updated October 2020. In Nevada there are 36 separate primary "C" license classifications for contractors whose construction work requires special skill and whose principal contracting business involves the use of specialized building trades or crafts. Roofing is one of these trades. Keep in mind, even though there are code related questions that are state specific (depending on the code versions adopted), technical questions are almost always based on the NRCA/OSHA answers! We create these supplemental self-practice test questions module referencing the principles and concepts currently valid in the corresponding trade. Each question comes with an answer and a short explanation which aids you in seeking further study information. These questions are intended as supplementary study material for fundamental knowledge establishment. They are NOT actual past-paper questions. You should use this product together with other study resources for the best possible exam prep coverage.