一、外墙渗水原因1.材料质量控制不严。砌筑砂浆宜采用净中砂,含泥量〈5％,如含泥量大,其粘性大、和易性差、收缩性大,均使砂浆不密实,雨水很容易沿缝渗到墙内,另处用此类砂浆作内外抹灰砂浆,砂浆本身就会因为收缩性大而引起开裂,若抹灰前未对砖浇水湿润,砖墙面与抹灰面层粘结度差而产生空壳现象。 First, the external water seepage reasons 1. Material quality control lax. Masonry mortar should be used in the net in the sand, clay content <5%, such as clay content, the viscosity, and easy to work, shrinkage, are mortar is not dense, rain is easy to penetrate into the wall along the seam, Another use of such mortar for plaster mortar inside and outside, the mortar itself will be due to shrinkage caused by cracking, plastering brick before the water is not wet, the brick wall and the plaster surface poor adhesion and the resulting empty Shell phenomenon.