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You can sprinkle water on the wall first. If the putty falls off with a light scrape, it means ordinary putty. On the contrary, if it cannot be scraped, it means water-resistant putty. Water-resistant putty is firm and solid, so there is no need to scrape it on a large scale. If there is bulging and hollowing, refuse to scrape it. Compared with water-resistant putty, ordinary putty is not as firm and solid. You should scrape directly to the scraping place of the plaster to observe whether the bottom plaster is firm. If you find that the plaster layer is hollow, scattered, and loose, you should continue to scrape until the wall base.

If the sand-ash wall is a brick-concrete structure, that is, there is a layer of sand-ash outside the red wall, it is strongly recommended to scrape it, and it must be scraped to the red brick layer, because this kind of house is too old and the wall has been broken for a long time. If you don't scrape and re-lay the putty, it will easily cause problems later.