Hutt at Heart
condensation on a window

Eco Design Tips: Moisture sources

High moisture levels in the house are undesirable whether it is summer or winter.

When there are high moisture levels in the house, cold days will feel colder (and more uncomfortable), and warm days will feel warmer (and more uncomfortable!). High moisture levels in bedrooms over summer will make for poor sleep.

Too much moisture can also lead to condensation and mould problems, which can be harmful to your health.

So how do we control moisture? It is best managed by stopping it at source, then mechanical control (extraction), then physical removal of moisture (ventilation, dehumidification).

Here are some common sources of moisture, how much water is released into the environment, and what can be done to remedy or reduce the amount of moisture released.

  • Moisture from damp soil under the house: 4L per m2 (60L from a 150m2 house) per day.
    Solution: Polythene moisture barrier.
  • Unvented clothes dryer: 5L per load.
    Solution: Vented or condensing dryer (or have dryer outside the house if possible).
  • Drying laundry inside: 5L per load.
    Solution: Dry laundry outside if possible, under cover if wet. Use a dehumidifier if drying laundry inside is unavoidable.
  • Cooking: 3L per day.
    Solution: Use pot lids and extraction fans.
  • Showers and baths: 1.5L per person per day.
    Solution: Use extraction fans, close bathroom doors, shower-cover (Shower-domes).
  • Dishes: 1L per day.
    Solution: Avoid air drying dishes.
  • Unflued gas heater: 1L per hour.
    Solution: Don’t use unflued gas heaters. Watch this video for alternatives.
  • Pot plants: as much as you give them.
    Solution: Limit the number of pot plants.
  • Fish tanks: as much as you replace.
    Solution: Cover fish tanks.
  • Poor paint condition.
    Solution: Repaint.

Hutt City Council offers a free home assessment service by our in-house Eco Design Advisor.

For a full house assessment and advice,

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