@Some_German_Guy @MeBigbrain It would eventually light up, yes, but basically only in an arson scenario. It would take longer for fire to actually take, because it doesn't have internal voids that allow air flow. This means in normal fire scenarios, it's less likely to burn. I've seen videos about swiss buildings being made with solid wooden walls instead of insulation, and because it doesn't have air channels in the walls it's actually really hard to start a fire in one. This is the same idea but on a smaller scale.