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首页> 外文期刊>Journal of testing and evaluation >Moisture Damage in Vented Air Space of Exterior Walls of Wooden Houses
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Moisture Damage in Vented Air Space of Exterior Walls of Wooden Houses

机译：木屋外墙通风空间的水分破坏

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摘要

Most of the exterior walls of wooden houses in Japan have a vented air layer between the exterior cladding and the insulation. This vented air layer is designed to dehumidify the exterior walls by discharging humidity to the outside and allowing outdoor air to enter, thereby decreasing the risk of condensation on the exterior wall during winter. It is assumed that the source of this moisture is the indoor air, and that the outdoor air is drier. However, the outdoor air is often highly humid during the rainy season and may become a source of moisture. The vented air layer also allows rain water to drain away. Any rain water penetrating through the exterior cladding is drained away through the vented air layer. However, rain can also enter the vented air space through the air inlets. Since it takes a certain amount of time for all the rain water to drain away, water may accumulate in the vented air layer and produce high humidity in the exterior wall. In order to evaluate the effectiveness of an exterior wall with a vented air layer, its hygrothermal characteristics should be investigated, taking the effect of rain water into consideration. This paper describes a case of moisture damage where stain appeared on the outer surface of the plywood wall in a wooden residential building. Experiments were carried out in climate chambers to clarify the conditions that are causing stain. Hygrothermal conditions in the vented air layer were simulated using heat, air, and moisture model, and the causes of staining were investigated.
机译：在日本，木制房屋的大多数外墙在外墙和隔热层之间都有通风层。该通风的空气层旨在通过将湿气排放到外部并允许室外空气进入而使外墙除湿，从而降低了冬季结露在外墙上的风险。假定这种湿气的来源是室内空气，而室外空气更干燥。但是，在雨季，室外空气通常非常潮湿，并可能成为湿气的来源。通风的空气层还可以使雨水排出。穿过外覆层的雨水通过通风的空气层排出。但是，雨水也可能通过进气口进入通风的空间。由于所有雨水都需要花费一定的时间才能排出，因此水可能积聚在通风的空气层中并在外壁产生高湿度。为了评估具有通风层的外墙的有效性，应考虑雨水的影响，研究其湿热特性。本文描述了一种湿气损坏的案例，该案例中，一栋木制住宅楼的胶合板墙的外表面出现了污渍。在气候箱中进行了实验，以弄清引起污点的条件。利用热，空气和湿气模型模拟了通风层的湿热条件，并研究了污染的原因。

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