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High humidity

The humidity indicates how much water vapor is in the air. If it contains a lot of water vapor, it is referred to as high humidity. Low humidity means that the air is dry with little water vapor. How much water the air can absorb depends on the temperature. Warmer air can hold more water vapor than cold air. If water vapor continues to be supplied, although the air has already absorbed its maximum possible, condensation water is created. This means that the gaseous vapor liquefies again and small water droplets are created. They are reflected on the window or on the wall.

The humidity in the apartment not only plays a role for the building fabric, it also affects our well-being and is reflected in our health. While the human mucous membranes begin to dry out and the airways are irritated when the air is too dry, we suffer from sweating when the air humidity is too high.

In addition, the molds multiply and pose a health risk. While the human body can perceive temperature differences, we only realize differences in humidity in extreme situations. In addition, we perceive more humid air as warmer and drier air appears cooler to us.

High humidity in the apartment

In living rooms, 60% humidity is the upper limit, while 70% can be reached in the bathroom. However, if you sleep with the window closed, you have already exceeded the limit value in the bedroom with 60% humidity. Since exhaling increases the humidity in the air, the sleeping percentage should be kept a little lower. You can find an overview of the optimal values ​​in the various living spaces here: Air humidity table.

As a rule, it can be assumed that the room humidity in the apartment should not exceed 70%. There is an increased risk of mold formation from 60%. The optimal humidity for health is 50%.

Too high humidity has two negative effects. It is harmful to the building fabric and endangers our health. The causes can also be justified in different ways.

Mold from excessive humidity

If the room air contains too much water vapor, mold can easily develop. Incorrect ventilation or poor heating behavior can be to blame for this. If you do everything correctly, you are not immune to excessive humidity with mold growth, because structural defects can also cause them.

When exposed to heat with the help of water, mold can form on organic material such as plaster, dust or wallpaper. Mold preferentially occurs where warm air meets a cold outer wall. Condensation forms there. The wall becomes damp and forms the ideal breeding ground for mold.

Older houses with poor thermal insulation or partially restored houses with strong thermal bridges are also affected by mold growth, as are new buildings that have not yet completely dried out. In both cases, a humidity of 60% can be too high and promote mold growth. For more information see: Humidity mold.

Health effects

  • If there is too much humidity in the room Mold growth has led, it is not beneficial to human health. The mold spores get into the airways and can cause allergies or asthma.
  • Also Mites feel particularly comfortable from a humidity of 60% and above. For allergy sufferers, this means that they should try to keep the water vapor content in the air below 55%. In this way he can avoid an increased increase in allergy triggers.

Because health is also related to well-being, it must be borne in mind that with warm temperatures and high moisture content in the air, there is increased sweat is to be expected. This means that if the room is well warmed up, the body reacts to excessive humidity with sweating. The uncomfortable feeling of sultriness arises.

Causes of excessive humidity

First and foremost, there are two big mistakes that are made again and again and result in too high humidity: firstly, incorrect ventilation and secondly, poor heating behavior.

Incorrect ventilation: Especially in winter, when it's cold, we tend to keep the windows closed so as not to freeze. The more people there are in the room, the more air you breathe into the room. Since the air we exhale always has a higher moisture content than the air we inhale, the humidity in the room increases with every breath.

If the windows are not opened and ventilated in order to dissipate the moisture to the outside, it cannot escape. It stays in the room and leads to increased humidity and even condensation that is deposited on the wall or window. Mold growth and damage to health are inevitable. You can find out how to avoid incorrect ventilation here: Ventilate correctly

Bad heating behavior: Whether electricity, gas, oil or pellets, heating material is expensive. Therefore, of course, everyone tries to keep their heating costs as low as possible. If you only leave the apartment for a short time, you can of course turn your heating down, because the apartment won't cool down in an hour or two.

However, if you work outside the home during the day and only heat up the apartment at the end of the day, the heat is not sufficient to heat up the cold outside walls sufficiently in the few hours until night falls. The result would be that condensation would collect on the cold wall. Mold forms, which in turn can lead to damage to health.

Tips on how to avoid or reduce an increase in humidity in the room:

  1. Iron Not with the window closed. Because when you flatten it with the hot iron, the still damp laundry releases moisture into the air in the form of water vapor. As a result, the air humidity increases.
  2. Even if done by hand Wash the dishes, water vapor rises from the sink and increases the humidity in the room. If you do not want to wash with the window open, you should at least ventilate briefly afterwards.
  3. That too Dry your clothes in the room increases the humidity significantly. Because in order for the laundry to dry out, it has to release the moisture into the air in the form of water vapor. The clothes horse therefore does not belong in the apartment in any weather.
  4. Because not only do humans release moisture into the air through the air they breathe and through the skin, but also plants, the humidity increases with every plant in the room. In order to reduce the humidity, you should ban plants from the apartment and rather decorate the balcony or terrace with them.
  5. Of course also have to Pets inhale and exhale. So if you have a little friend at home, you should remember that the air they breathe increases the humidity in the room and rather ventilate them once more.
  6. Aquariums and terrariums also give off moisture to the room through evaporating water as well as through the tropical temperatures that often have to prevail in the terrariums. For this reason, you should neither set up the aquarium nor the terrarium in a room where there is already a high level of humidity.
  7. On one Indoor fountain you should also do without, because the splashing well water also releases water vapor into the room air.
  8. Because New buildings often take more than a year to dry out completely, you will need to ventilate more frequently when moving into a newly built house. In this way, you conduct the moisture that is released into the room by the not yet completely dry walls to the outside.
  9. But also with older houses you have to expect increased humidity. Since these structures are often insufficiently insulated, so-called thermal bridges often occur. There, the warm room air is increasingly released to the outside, which leads to the formation of condensation and often leads to mold. Here, too, helps: ventilate, ventilate, ventilate.
  10. Already at Indent In an apartment you should remember not to place cupboards or wall units against an outside wall. Because the warm room air cannot circulate behind the cabinet, the wall remains cold at this point. The high temperature difference leads to the formation of condensation and the risk of mold growth.

If you not only want to prevent an increase in humidity, but also want to reduce the humidity in the room, you will find useful tips here to reduce humidity.