Fire. Using these materials (mentioned in the website) your house will ranked in the best and second best category related to fire safety. Your family would be safe. Additional pumps that use the underground lake’s water will be an extra measure to extinguish fire. The water could be pumped inside of the building, or in the niche of the chimney effect. The facade can be sprayed with water from the outside. For example an Arduino sensor would be able to pick up the presence of smoke or the slightest temperatures differences. So the pumps could do their duty in seconds. Positioning the empty water pipes under the false facade is a good idea.
They will be easily accessible and you won’t see them at all. Spraying high-pressure water for a few seconds would stop the fire in seconds … It would save your belongings. You won’t even have to repaint the walls or do anything in special after the incident. Note: use 2 “layer” of water pumps and cables and an additional battery to prevent equipment failures. An additional pump, battery, cables, Arduino system will cost nothing compared to building a new house. This way your kids, house, objects would be safer than 99.999% of the houses. Your house and children would be super safe at home all the time. (even those whose children have a lighter in their hands all the time).