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Tip and Tricks - Proper ventilation


Water vapor can cause mold stains and mold. Therefore, it is more important than ever to properly ventilate modern apartments with sealed windows and doors and thermally insulated exterior walls.

Per day, each person releases 500-1000 grams of humidity into the air. The same applies to plants and animals. Humidity also occurs in the kitchen and in the bathroom. It has to be released through proper ventilation. The basic rule is that the warmer the room temperature, the more humidity can be absorbed. At a room temperature of 20 C, one cubic meter of air can absorb approximately 17 grams of humidity. As a result, humidity is at 100%. At a temperature of 10C, one cubic meter of air can only absorb approximately 9 grams of humidity.

Once the air has absorbed all humidity, it starts to settle in the form of condensate water at the coldest spot in the room. This can easily be seen on the bathroom mirror when taking a shower. And although it cannot easily be seen, this also happens on the walls of rooms. Permanently humid surfaces become the prime medium for mold stains and mold. The ideal room temperature ranges from 18C in the kitchen to 21C in a room with a relative humidity of 40-60%. Dry air (less than 40% relative humidity) has a negative impact on our mucous membranes and we feel uncomfortable. A lasting relative humidity of more than 60% in a room, promotes the danger of mold development.

Regular ventilation is necessary to promote a healthy room climate. It is wrong to keep the window permanently tilted because it causes ceilings and walls in the vicinity of the window to cool down more than the rest of the room which causes the above-mentioned problems.

Proper ventilation means to completely open all windows for 5-10 minutes twice a day to allow for a complete exchange of air. Afterwards, windows should be closed. Ideally, furniture should be placed at least 5 cm away from walls to allow for the circulation of air behind the furniture.

Should mold develop despite proper ventilation, construction measures become necessary.

We look forward to providing you with advice.