Why Roof Leaks Often Appear After HVAC Air-Sealing or Energy Retrofits
Part of the ROOFNOW™ Roofing Knowledge Center
Energy retrofits and HVAC air-sealing projects often change how air and moisture move through a building. These changes can reveal roof leaks that were previously hidden.
Pressure and Airflow Changes
Air-sealing reduces uncontrolled air leakage, which can alter pressure balances between the living space, attic, and roof assembly. Existing roof weaknesses may become newly stressed.
Moisture Concentration
Improved energy efficiency can concentrate moisture in fewer pathways. When that moisture reaches the roof deck, leaks become visible.
Condensation vs Roof Leaks
Some moisture events after retrofits are condensation-related, but true roof leaks are often uncovered at the same time, leading to misdiagnosis.
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