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Masonry
Moisture Control in Masonry Cavity Walls
Description
Masonry cavity walls use a gap between two wythes, or wall layers, to help control moisture. The cavity is usually at least 2 inches wide, and it may contain insulation. Even with insulation, a clear space of at least 1 inch is kept so water can drain away. Some walls also use a continuous drainage mat to reduce the needed s...
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Transcript
在空腔墙中,需保持最小间距以确保空腔排水畅通无阻。
通常,在空腔内使用连续排水垫层来偏转砂浆滴落物,并便于形成畅通的排水通道。
进入该空腔的水通过位于空腔底部、并设置在泛水层上方的适当间距的排水孔排出。
此外,腔体顶部附近的通风口可促进腔体内部的空气流通,并有助于腔体内湿气的蒸发。
可在外侧安装泛水以防止湿气渗入外墙,也可在内侧安装泛水将进入空腔的水重新导流至外部。
在空腔底部以及空腔中断的位置安装内部闪蒸层。
闪水带的一端由内叶墙上的防水屏障覆盖,另一端则延伸至外叶墙外侧并向下弯曲,形成滴水沿,以引导水流远离墙体自由下落。
常用的泛水材料包括金属板泛水、沥青膜泛水、复合泛水和合成橡胶泛...
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