In August of 2010, NFPA banned all new installations of Antifreeze Sprinkler Systems in Residential Occupancies. This is due to a number of incidents where the antifreeze system did not suppress the fire but unfortunately caused the mixture of Antifreeze and Water to flash-over or flame up.
When NFPA banned the antifreeze systems in new installations, it began to research into the possibility if antifreeze solutions do pose a hazard to the public safety. This research was broken into two phases. NFPA has finished both phases of research and is currently reviewing the results and applying any code modifications.
An update from NFPA regarding this issue can be found at: http://www.nfpa.org/assets/files//Antifreeze.safety.alert.Aug.2010.pdf
A copy of the Research Final Report can be found at: http://www.nfpa.org/assets/files//PDF/Research/RFAntifreezePh2.pdf
