外墙饰面板缝隙返霜的原因及补救措施海口南华大厦１～４层裙房外墙饰面采用意大利进口光面花岗石，总面积２３００ｍ２。竣工后不久，表面缝隙即出现滴水、返霜、返碱现象，影响装饰效果。本文叙述返霜原因及补救措施。１返霜原因分析（１）施工工艺落后，不适应光面花岗... Causes and remedial measures for the cracks on the outer wall of the soffit panel The surface of the external walls of the 1 to 4 storey of the Nanhua Building of Haikou adopts smooth granite imported from Italy, with a total area of ​​2300 m2. Shortly after the completion of the construction, the appearance of surface crevices, such as dripping, returning frost, and returning to alkali, affected the decorative effect. This article describes the reasons for returning frost and remedial measures. 1 Analysis of the reasons for returning frost (1) The construction process is backward, not suitable for smooth gl ...