Leviticus 14:42-45

Then they shall take new stones and replace the [contaminated] stones, and he shall take plaster and replaster the house. “If, however, the mark breaks out again in the house after he has removed the stones and has scraped and replastered the house, then the priest shall come and look again, and if the mark has spread in the house, it is a malignant leprosy in the house; it is [ceremonially] unclean. He shall tear down the house—its stones and its timber and all the plaster of the house—and shall take everything outside the city to an unclean place.