![]() ![]() By heating up the test spaces to a minimum of 18 degrees Celsius, in less than 1% of the time high relative humidity was an issue in that study. ![]() Research by BRANZ has clearly pointed out that our homes are not cold because they are damp, they are damp because they are cold. ![]() We can do this by reducing the relative humidity or by warming-up our building itself, though often both are required in cold damp homes. In essence, we have to lower our dew point, the temperature at which the water in our cup starts to overflow. There are ways in which we can alleviate condensation in our homes. How can I avoid condensation on my windows and building structure? The end goal is to have our surfaces indoors and in the walls above the dew point, to avoid condensation. The dew point is dependent on the temperature of the air and the relative humidity at that temperature. Once your surface has cooled the air to that temperature, the air will release the water as condensation on your window or window frame most often. The dew point describes the temperature at which the cup cannot hold the water anymore. The reason that condensation usually happens most visibly on our windows is that the windows are the coldest spots in the house-the point where our air cannot contain the water anymore as it shrank. But the water content stayed the same and is now 100%, so the water overflows as the cup cannot hold the liquid anymore. Our cup (with 50% RH) could shrink to half its size. When the air gets colder, it shrinks in size. In other words, the cup is between 40% and 60% full of water. The healthiest indoor air has a relative humidity between 40% and 60%. If we fill the cup half full of water, then we have 50% relative humidity (RH). Imagine, for example, a cup as a particle of air. Relative humidity describes the amount of water relative to what a particle of air can hold. In our homes, we increase this amount by breathing, cooking or having a shower. There is, depending on the weather, a varying amount of water in the air. Moisture or water vapour is the presence of water in the air. Lastly, we will give some tips on how to ensure you and your building are healthy. Then, we will offer a calculator for you to calculate your dew point. We follow this by providing quick examples of what can happen when we get it wrong. Here we will give you a quick explanation of the different terms of moisture, relative humidity, condensation and dew point. It is that time of the year again in NZ-having condensation on our windows. ![]()
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