Own personal moisture production

Can you produce so much moisture yourself that damage occurs? No!

The wildest stories go around about the own moisture production. According to certain literature, this would even be huge, up to 10 – 12 litres per person per day. Every person would lose at least 1 litre moisture at night while sleeping.

You can test this yourself by weighing yourself at night and in the morning. The difference will be approximately between 90 and 120 grams per person per night. With three people in a home, this is a moisture loss of only 270 – 360 grams.

Drying clothes would also produce a lot of moisture in a home. If you put the washing in a condenser drier and collect the water, with very wet washing, you’ve only collected 1 litre water.

During cooking it also isn’t easy to reduce half a litre. Almost always an extractor hood.

Therefor the values of the own moisture production in a home are strongly exaggerated and not accurate anymore. The total of the own moisture production can be calculated to a maximum of ≈ 2 litres per day per person.

This contrasts the moisture production of all underlaying constructive causes. You can calculate this at ≈40gr/m²/hx24h (see handbook Moisture control). With quick math you get an underlaying moisture production which is easily 30 – 50 times more than the maximal own personal moisture production.

With a reverse evidence you can see that there cannot be damage by personal moisture production in a home, even without any aeration or ventilation.

In other words, forget occupants behaviour and search for all the third underlaying causes.