Table 4Methods for controlling moisture in existing buildings

MethodEffect on construction costEffect on energy consumption
Consumer behaviour and operation
 Limit use of humidifiersNoneDecrease
 Do not dry laundry in living areaNoneDecrease
 Use kitchen range hoods and ventilation during cookingNoneIncrease or decrease
 Use ventilation and airing to prevent high indoor humidity and condensationNoneIncrease or decrease
 Increase indoor temperature to decrease relative humidityNoneIncrease
 Improve performance of ventilation (natural or mechanical)MinorIncrease or decrease
 Install mechanical ventilation system to improve ventilation (with or without heat recovery)MediumDecrease
 Install double glazing to prevent condensationMediumDecrease
 Improve roofing to prevent water leakages, when applicableMediumDecrease
 Ventilate crawl spaces to prevent moisture migration from ground, when applicableSmall increaseNone
 Install range hoods in kitchenSmall increaseIncrease or decrease
 Replace unvented open-flame heaters and appliances with vented onesSmall increaseImproves efficiency and reduces primary energy use

From: 3, Moisture control and ventilation

Cover of WHO Guidelines for Indoor Air Quality
WHO Guidelines for Indoor Air Quality: Dampness and Mould.
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