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interstitial condensation
Interstitial condensation is a form of structural damping that occurs when warm, moist air penetrates inside a wall, roof or floor structure, reaches the dew point and condenses into liquid water. Interstitial condensation is differentiated from surface condensation in buildings sometimes called "cold-bridge condensation" or "warm front condensation"〔(Tim Hutton. "Condensation". ''The Building Conservation Directory'', 2004 accessed 2012-05-16 )〕 where the condensation forms on the interior or exterior surfaces of a building rather than inside the wall or roof cavities. The warm, damp air may penetrate a wall from the inside of a heated building in a cold climate or from the exterior of an air-conditioned building in a warm climate. This condensation may allow mold growth, rotting of timber, corrosion of metal components and/or a reduction in the thermal insulation's effectiveness.〔("Interstitial condensation and fabric degradation" - BRE - The Construction Information Service. Products.ihs.com. accessed 2012-05-16 )〕 The resulting structural damage may occur without visible indications until significant damage has occurred. Most building materials are permeable so the common method of controlling interstitial condensation is to control indoor moisture at its sources or through dehumidification and/or ventilation and add an impermeable barrier on the warm side of the wall.
==Moisture sources==
Buildings always contain moist air. The recommended indoor relative humidity of air is a range of 40% to 60%. The sources of interior moisture are people, appliances such as dishwashers, cooking, showers, wet basements, and roof/wall leaks. Exterior moisture of concern to condensation is from the warm, humid air. Leaks of liquid water into the building envelope is a different problem than condensation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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