1 measuring the humidity 2 lowering the humidity 3 increasing the. Main content metrics author article info.
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Controlling moisture can make your home more energy efficient less costly to heat and cool more comfortable and prevent mold growth.
Humidity in attics sources and control methods. Another method of reflecting the radiant heat caused by the sun is through the use of a radiant barrier. The best strategies for controlling moisture in your home depend on your climate and how. Humidity in attics sources and control methods peter cleary lawrence berkeley laboratory introduction there is general agreement among experts in the field that attics should be venti lated to prevent condensation and wood decayg rules of thumb exist for the area of vents needed for houses in various parts of the ues but.
At 140 f 80 humidity corresponds to 120 torr or 16 of atmospheric pressure. Some common sources for attic moisture are showers dishwashers dryers cookers washing machines baths humidifiers and other heat producing machines. If the attic is at 80 f and 80 humidity that s about a 21 torr vapor pressure of water.
Keep in mind that mold is sometimes caused by another source of water like a leaky ceiling or faucet and may not specifically be due to excessive humidity. For arid climates humidification is necessary and options such as higher airflows and in duct steam humidifiers are great solutions. If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.
So they equalize pretty quickly. Humidity in attics sources and control methods. In most cases these sources do not produce excessive moisture however if a house is very air tight and or if ventilation is poor it can certainly contribute greatly.
A radiant barrier is a metallic film that can be used under certain roofing materials on the roof deck or inside the attic on top of the insulation to reflect heat back towards its source. The difference in the two spaces is the dry bulb temperature. If you raise the attic temperature the rh in both places would be the same.
Thumbnails document outline attachments. Properly controlling moisture in your home will improve the effectiveness of your air sealing and insulation efforts and these efforts in turn will help control moisture. Presentation mode open print download current view.
During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. In order to control humidity indoors a technician must be aware of her climate zone and whether she must work to increase or decrease humidity levels indoors in relation to outside levels. Download pdf to view view larger.
This is the best way to control the humidity in a room especially if that humidity level needs to be. So compared to that hot humid attic the vapor pressure at the other side of the foam is a factor of six higher. By adding moisture to the lower floor you increase the partial pressure of the water vapor which pushes it to areas of lower vapor pressure like the attic.
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