Since rain apparently doesn't always extinguish lightning fires, many of my buildings are now at danger of spontaneously combusting.
Besides building solely with non-flammable materials like stone (which actually tends to make things rather ugly), what are some methods to safeguard against (or at least stall) disasters like this?
I experimented with putting a layer of water between floors so that fire is immediately extinguished as it breaks through ceilings, but the walls still burned up and I was left with a soggy mess to clean up later.