Which measure is a moisture control strategy that removes internal moisture sources?

• A. Remove internal sources of moisture
• B. Exhaust humid air directly
• C. Seal water leaks
• D. Use HRV/ERV

Answer: (A)

The key idea is stopping moisture at its source. Removing internal sources of moisture tackles the problem where it begins, so humidity inside the building can be kept low without relying on continual ventilation or dehumidification. By eliminating activities or conditions that generate moisture—like indoor drying, cooking, or leaks—there’s less moisture that needs to be removed later, which helps prevent condensation and mold and can save energy overall.

Exhausting humid air directly lowers humidity by removing moisture-laden air, but it doesn’t stop moisture from being produced in the first place. Sealing water leaks reduces moisture entering from outside or from leaks, but it doesn’t address moisture being generated inside. Using an HRV or ERV helps manage humidity through controlled ventilation and heat exchange, yet it doesn’t eliminate internal moisture generation on its own.