How many floors can be built is closely related to the main structure and infrastructure. This question cannot be simply asked. It is suggested to find a professional designer to calculate and evaluate the foundation and give how many floors can be built. Generally speaking, the seismic fortification area will not exceed six floors. As you said, 18 wall, the main load-bearing structure is different from the conventional 24 wall, and the strength of shale brick is unstable. I don't know what you said.