Ventilate the basement in the summer
Many households use the opportunity to thoroughly ventilate the basement during the summer months. While the windows often remain closed in the cold season to keep the heat in the building, they are often open all day in midsummer to ventilate the typically musty odor and dry the basement.
The idea seems good However, it is not at all an incoming effect. So instead of a fresh and dry cellar, the opposite often occurs. Especially wrong airing in the summer often causes moisture and mold damage!
Summer condensation causes cellar walls to "sweat"
What sounds paradoxical at first, is based on a simple physical principle that everyone has already seen. To imagine what happens to the cellar walls when airing in midsummer, just take a drinks bottle out of the fridge on a hot day. Within a very short time, moisture builds up on the outside of the bottle - countless dew beads of small water droplets have formed.
At warm temperatures, condensed water settles out of the surrounding air at the bottle.
But where does the water come from? The answer: Warm air can absorb and transport much more moisture than cold air. When the warm air hits the fridge-cold bottle, it cools down and releases some of the stored moisture as condensed water to the surface of the bottle. Experts speak in this case of the so-called summer condensation.
On hot days, several liters of water reach the cellar via the air.
This principle also applies on a larger scale in one's own cellar. Just take a sultry summer's day with temperatures of 30 degrees and a relative humidity of 60 percent. In one cubic meter of air, around 18.2 milliliters of water are stored under these conditions. If this air flows into the basement, where only 16 degrees prevails, it cools down very quickly. At 16 degrees, the air can absorb only 13.6 milliliters of gaseous water. The excess remainder - ie around 4.6 milliliters per cubic meter - condenses on the cold masonry.
In a cellar with a 3x4 meter footprint and a ceiling height of 2 meters, more than 100 milliliters of water are released into the walls per air exchange. Considering that the air is replaced several times in a short time, just a few times in a row, several liters of water can "store up" in the cellar for a couple of hot days in a row , musty room climate - an ideal breeding ground for later mold infestation.
In the summer only air in the morning and in the evening.
To avoid moisture in the basement and mold damage, experts advise to ventilate only on mornings and evenings on hot days The windows should be left open for longer on cooler days, and furniture and shelves should be at least 10 cm away from the outside wall to ensure adequate air circulation. to transport the excess moisture outside through the mostly dry winter air.
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