[ARCHIVED] Upgraded fire-proof objects catching fire a lot

I just had the same problem. I left my fireplace (fireproof) on and started letting my characters socialize, they were sitting right in front of the fireplace and the fire started spreading. I had one of the character attempted to extinguish it and she ended up burning and the other character had to extinguish the fire on her. Then I had both of them extinguish the spreading fire and a message stating that there is a fire going on and that this interaction (extinguishing the fire) is unavailable. I tried everything and nothing worked. I knew I had forgotten about the sprinkler but I was unable to go into Build/Buy mode. So I would love to have the firemen back.