Resilience is the buzzword for this decade. Designing resilient roof curbs, in my estimation, will become a standard and make its way into the codes by 2030 or before. Roof curbs now come in a plethora of designs to suit every individual need. You can check out more about mechanical roof curb through 

This is the second in a series of articles based on experience and observations following extreme climatic events on how I have designed resilient roofs and/or how I would suggest various components of the roof designs for resiliency.

In this article, we will look at roof exhaust curbs, typically used to support mechanical equipment. The goal is to prevent the units and/or curb from being blown out of place and across the roof. What are the qualities that make a resilient roof curb? This is the first question you are now thinking about, so I will tell you. Resilient roof curbs should:

  • Be tall enough to be at least 4 inches above the top of the highest abundant drainage.
  • Be of solid and strong construction.
  • Be anchored to the roof structure.
  • Secure the unit to the curb.

The structure of the curb is important, in that it not only needs to support the equipment on top but also to take the loads imposed on it by wind, water, snow, sliding ice, etc. The curb is recommended to be of 16-gauge metal, of fully welded construction. It should be insulated and have a metal liner of the same gauge as the exterior of the curb. For long curbs, internal reinforcing is recommended.