Okay, so my suggestion is actually two suggestions in one that kind of compliment each other. 1st, burning barrels which could lower chance significantly of your base getting set on fire while inside your base (to be clear, inside your base doesn't mean inside the house) but if you have walls then like behind those walls. 2nd, certain flooring could stop fire spread entirely when combined with burning barrel. So I'm thinking one cement or gravel slab placed down under the burning barrel should prevent fires from being caused in your base other than in the intended burning barrel obviously. This would not work in a building made of wood but could still be plausible in a stone, brick or cement room without any furniture. This came to me cause in my city we have to have a designated burning container to have fires ever since the city took over. Prior bon-fires were possible but they claim that burning containers can prevent forest fires or just out of control fires in general. So I figured we could do the same with PZ. Thoughts?