How does PVC pipe behave when exposed to fire?
PVC pipe, while combustible, does not continue to burn once a flame source is removed. A main cause of fire fatalities is exposure to carbon monoxide, which is produced from common materials and products like wood, furniture, carpet, and fabrics. It is estimated that plastic pipe systems represent less than 1% of the mass of all combustible products in a building. The majority of piping is also installed behind non-combustible materials such as gypsum wall board. More information can be found here: http://www.ppfahome.org/pdf/safety.pdf.
