Roofing Sample Guidelines for Forensic Hail Damage Evaluations By Steve Smith, P.E. Replacing a commercial roof can cost many thousands or even millions of dollars. That is why accurate analysis of a roof is essential. Well installed and properly maintained roofs can last for decades; however, a significant weather event can damage the roof investment, and often result in conflicts between building owners, insurance carriers, roofing contractors, public adjusting firms, and yes, even attorneys.  Laboratory analysis of roofing samples is unlikely to prevent such conflicts, but accurate information can help roof consultants develop well-informed opinions and play a crucial role in settling such conflicts. The importance of laboratory testing For decades, laboratory testing of roofing samples has played a key role in better understanding the cause of damage, the extent of damage, the date of damage, and even repairability of roofs. Most roof consultants do not have their own laboratories