July is peak HVAC season across Missouri and Illinois. Rooftop units are cycling constantly to keep buildings comfortable, and that heavy use does not stay contained to the equipment itself. Vibration, added foot traffic from service calls, and the sheer number of hours units run all place ongoing stress on the roof surface underneath. We have written before about hail striking rooftop HVAC units, but the wear that builds up during a normal, heavy-use summer is a different kind of risk — quieter, slower, and easy for property managers to overlook.
Constant Vibration Adds Up
Compressors and condenser units running for hours at a time generate vibration that transfers into the roof deck and membrane around equipment curbs and pads. On its own, a single day of operation is not a concern. But over weeks of continuous summer runtime, that vibration can gradually loosen fasteners, wear at pipe supports, and stress the seams and flashing closest to the equipment.
More Equipment Use Means More Foot Traffic
Heavy HVAC demand also means more service calls. Technicians walking the roof repeatedly to reach units adds foot traffic at exactly the time of year when the membrane is softest from heat exposure, which makes it more susceptible to scuffing, indentation, and small tears — especially in areas without walk pads or designated access paths.
Heat and Mechanical Stress Compound Each Other
Rooftop equipment areas rarely fail from one cause alone. Heat softens the membrane, vibration works at fasteners and seams, and added foot traffic increases physical wear, all at the same time and often in the same small footprint around each unit. Pitch pans, curbs, and penetrations near equipment tend to show the combined effect first.
Signs Rooftop Equipment Is Affecting Your Roof
- Worn or compressed membrane paths leading to and around units
- Loose, backed-out, or missing fasteners on equipment curbs
- Cracked or deteriorating pitch pans and pipe boots
- Ponding water near equipment pads where drainage has been blocked
- Soft or spongy decking felt underfoot near HVAC platforms
Simple Steps to Protect the Roof This Season
Installing or checking walk pads along common service routes is one of the most effective, low-cost protections available. It is also worth confirming that equipment is properly mounted with vibration isolation where applicable, and coordinating with your HVAC vendor so roof access is limited to what is actually necessary. A mid-summer inspection focused specifically on equipment areas — rather than just the field membrane — can catch developing issues while they are still minor repairs.
At Jewett Roofing, we regularly find that the areas around rooftop equipment need attention well before the rest of the roof does. If your building has been running its HVAC system hard this summer, it is a good time to have those areas checked.
