外文翻譯--使用隔汽層防止冷凝-其他專業(yè)(編輯修改稿)
2025-02-24 09:55 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 n the studs of frame construction. The interior surface is generally lath and plaster, or wallboardboth porous. The exterior is generally wood sheathing, with shingles, clapboards, or stucco. The heat resistance of the insulation is such that during the winter the location of the dew point falls within the insulation. Theoretically, the resulting condensation should occur within the insulation. This, however, does not occur. Condensation, when it within the insulation, but on the inside surface of the sheathing. The principle involved is this: Whenever the dew point occurs within a material, condensation will not occur until the flow of water vapor encounters the surface of another material of greater resistance to the flow of water vapor. That is, as long as the air can keep on moving, it will carry the moisture along with it and will not deposit the moisture until it reaches a surface that resists its flow and is colder than the dew point. The problem inherent in blownin insulation can be solved by“ coldside venting.” In applying blownin insulation, an opening usually is drilled through the exterior wall surface between each pair of studs. These holes should never be scaled, only covered with porous waterrepellent material for protection against the weather. Then, whatever water vapor flows through the inside porous finish can escape to the cold air outside without condensing. With clapboard construction,“ toothpick” wedges may be driven under the lower edge of each clapboard to provide the required openings for breathing. To sum up: vapor barriers, or as much resistance as possible to vapor flow (or a
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