Medical Facility – Midwest U.S.

The medical facility was experiencing build-up of frost and ice in above-ceiling spaces and in clerestories during winter months two years after construction. The frost/ice eventually melted, causing damage and leaking into occupied rooms below. Liberty discovered the causes to be an improperly designed air barrier system, improperly operating humidifiers set so high as to cause excess humidity, and exfiltration of humid interior air through HVAC-induced building pressurization. Our data loggers showed how properly operating the humidifiers without sacrificing occupant comfort solved the frost/ice problem without having to disrupt facility operations by replacing the air barrier or changing pressurization. The wireless, internet-accessible data loggers were left in place to allow the owner to continue to monitor the building operation.