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Reducing Condensation in the home.

March 19, 2011

Pool of condensed water vapour on window sill

Condensation is a problem in the home between September and April and will occur when warm moist air cools down to a point at which the air starts “leaking” its water vapour.

“Leaked” water vapour becomes visible on cold surfaces (such as glazing) in the form of water droplets. In extreme cases, large pools of water will eventually form on window sills and a black mould will appear.

The two important variables influencing condensation are the internal Air/Surface Temperature and the amount of Water Vapour in the home. If you can increase the air/surface temperature and reduce the amount of water vapour in the air, you’ll be making progress.

Increasing air/surface temperatures can simply be achieved by keeping the home warm. Warm air can retain more water vapour than cold air, so simply having the central heating on will absorb large volumes of moisture, just like a sponge.

Reducing water vapour in the home can be achieved by following these 4 simple steps:

1. Open windows daily for a short period of time (about 15 minutes), to allow water vapour to escape.

2. Keep the bathroom door shut and the bathroom window open after a shower/bath for about 15 minutes.

3. Dry clothes outside and not on radiators. In winter dry clothes on a clothes rack.

4. Clean windows regularly and wipe the glass with an anti-bacteria spray to kill mould spores.

If you want to be a little more scientific, get yourself a relative humidity alarm that will sound if the water vapour increases above 70%.

Please note that the Condensation Season lasts from September to April. From May to August the internal air temperatures are too high and relative humidity too low for condensation to be a problem.

Good Luck!

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