窗台以下的墙身,腐蚀粉化是常见的现象,尤其年久失修的住宅,在勒脚上、下常常长满了绿茸茸地苔鲜,整个砌体象松软的粘土一样,稍一触及,即有块物散落,整个勒脚自然粉蚀得参差不齐。粉化的原因: 往往由于勒脚构造欠合理,地表水,及雨水不能及时排除,墙基防潮效果不佳(或没有敷设),使墙身经常受毛细水及地表水 Corrosion and powdering is a common phenomenon in the wall below the window sill, especially in dwellings that have been in disrepair for a long time. Laid on and under the feet often covered with green moss and moss. The entire masonry, like soft clay, touches slightly. That is to say, there are pieces scattered, and the entire natural coating of the feet is uneven. Causes of chalking: Often due to the unreasonable structure of the feet, surface water, and rainwater cannot be eliminated in time, the moisture-proof effect of the foundation is poor (or not laid), and the wall is often subject to capillary water and surface water.