Large Clay Chimineas For Sale Chimineas made of clay need to be protected from the weather. If left exposed to cold and rain a chiminea made of clay can get softer or crack. Chimineas that are regularly used should be filled with 50mm of sand or Gardeco lava stones (see https://fireplacesuk22086.bligblogging.com/30414028/5-laws-everybody-in-biggest-chiminea-should-know