Catastrophic residential fires can be caused simply by using everyday household appliances: from a faulty fridge, to an old heater. More Australians die in residential fires on average than by all other fires combined (Fran Molloy, 2019).Could we design a product that might reduce the occurrence of preventable house fires? New builds are subject to stringent fire safety standards, but what about existing buildings? How can we make them safer? Current fire-grade materials are structurally invasive and ecologically unsound, making them unsuitable for retrofitting. We designed Δ° Tile (pronounced Delta Tile) to address this problem. Δ° Tile is an extremely lightweight tile cladding system that can withstand temperatures of over 800°C. Δ° Tile is composed of the renewable resource- bacterial cellulose harvested from Komagataeibacter xylinus which can be super-critically dried to form a fire-resistant aerogel.