Derecho Winds Were No Match for the Mechanical Bond of Carlisle’s RapidLock Roofing System

On August 10, 2020, a devastating weather event known as a derecho ripped through parts of the Midwest.

A derecho, a line of widespread, fast-moving storms, is characterized by its damaging winds, often generating thunderstorms that bring additional rain and hail, and can produce catastrophic damages equivalent to tornadoes and hurricanes.

The derecho that occurred on August 10, 2020, was one of the most devastating natural disasters the Midwestern United States has experienced. Experts familiar with destructive storms believe this was one of the most intense of its kind, resulting in a state-level disaster proclamation for 27 of Iowa’s counties. The highest recorded wind speed during this event was clocked at 126 mph, with official estimates from the National Weather Service reaching 140 mph. The derecho storm had a 40-mile-wide path of destruction, maintaining consistent wind gusts lasting for 30 to 45 minutes as it tore through the Midwest.

The August 2020 Midwest derecho took its toll on commercial properties and their roof systems. Most existing roofing systems in the path of the derecho were compromised, with a portion of those resulting in blow-offs leaving the entire building exposed. After analysis of the impacted areas, it was discovered that all 29 roofs utilizing a Carlisle RapidLock System remained fully intact, while components of other systems were found in nearby parking lots and fields.

Several RapidLock projects in the derecho’s path experienced the storm’s most violent moments, including two schools in Marion, IA which withstood 130+ mph winds. Both schools selected RapidLock EPDM for their roofing system due to it’s defense against hail and ability to withstand high winds commonly associated with the Midwest. Although sections of the metal edging were incomplete when the derecho arrived in Marion, RapidLock’s superior mechanical bond held firm and outperformed other systems in the area.