Wind Effects on Hail Velocity and Impact Energy

DonanEngineering Articles, Commercial & Residential Roofing, DamageRecon, Forensic Engineer, Forensic Engineering, Hail and Wind, Registered Roofing Consultant

The relationship between wind, hailstone velocity, and impact energy is based on an understanding of fundamental physics. Over a half century of laboratory research and field studies have determined that the severity of hail damage to a roofing material is contingent on the kinetic energy at the point of impact and the roofing material’s resistance to that impact energy. These …

Tips for Identifying Intentional Roof Damage

DonanEngineering Commercial & Residential Roofing, Forensic Engineer, Forensic Engineering, Hail and Wind, Registered Roofing Consultant, Roofing Investigations

Part 1: Suspicious Damage Patterns Not Caused by Hail An important tip for identifying intentional roof damage, which is made to mimic hail damage to a shingled roof, is to observe the locations and patterns of the damage.  The patterns can be observed by circling each damaged location and then connecting the locations together with chalk lines. The location of …

Tips for Identifying Intentional Roof Damage – Part 2

DonanEngineering Articles, Commercial & Residential Roofing, Forensic Engineer, Forensic Engineering, Hail and Wind, Registered Roofing Consultant, Roofing Investigations

Part 2: Suspicious Damage Characteristics Not Caused by Hail An important tip for identifying intentional roof damage, which is made to mimic hail damage to a shingled roof, is to observe the characteristics of individual blemishes on the roof.  Examining close-ups of high resolution digital images is a useful method of determining whether a blemish was caused by hail, or …