The higher the relative humidity, the warmer a surface temperature needs to be in order to avoid condensation. At a specific amount of moisture in the air, the relative humidity will rise as air temperature falls.Ĭondensation can be expected to form on windows, doors and skylights given the right conditions. Relationship between Relative Humidity and Dew PointĪt a specific indoor air temperature, when relative humidity rises, the dew point temperature will also rise. If the surface temperature of an object falls below the dew point, water will form or “condense” on the surface of the object. Warmer air can hold more moisture than cooler air.ĭew point is the temperature at which the moisture in the air visibly forms into liquid or ice. Relative humidity is the measure of how much moisture is in the air compared to how much moisture the air can hold at a given temperature. This is condensation in its simplest form. Another example is a cold beverage in a warm room when you can see the water droplets form on the glass. Humidity levels increase when you shower, cook or even breathe. You can see examples of this in your everyday life. Indoor surface temperatures of windows, doors and skylights are lower than the dew point of the surrounding air.These include (but are not necessarily limited to) the following: There are several reasons that condensation forms.
To maximize the enjoyment and realization of these attributes, you should understand how condensation is formed and how it can be minimized.Ĭondensation is the formation of water or frost on a surface.
#DEW POINT CHART WINDOWS#
Since that time, AAMA standards developed by FGIA have evolved to include windows and doors of various materials and types, as well as ensuring that emerging technologies are assessed.Īs an association of window, door and skylight manufacturers, FGIA understands that these products enhance the beauty and comfort of your home by providing views, ventilation and daylight. Beginning in 1972, the Association began evaluating the thermal performance of windows and doors and developed its first voluntary standard for thermal performance specifically to measure the condensation resistance of windows and sliding glass doors.
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