Fires, explosions and carbon monoxide poisoning incidents occur every year with customers of natural gas and propane companies. When incidents do occur, gas companies typically conduct an investigation into the losses to assess liability and to prepare for potential future claims. The severity of the incident, to some degree, determines the type and sophistication of the investigation. In many cases, investigation into less severe accidents is conducted in-house. With the more serious incidents, engineers are customarily hired to conduct and direct the investigation. This paper addresses the role of the forensic engineer in the investigation of fires, explosions and carbon monoxide incidents related to potential gas company claims.