This Malibu Home owner, explains why he chose to rebuild with concrete after the 2009 fires.
The above home was built in Malibu, California using the Panel System including floors, walls, ceilings and roof structure, and withstood a wildfire zone.
Fire Ratings For EVG 3D Panel System
Fire-rating is derived from the wire mesh gauge in combination with cement thickness (see chart below). The insulation core Type I polystyrene demonstrated a flame spread index of 25 or less and a smoke developed rating of 450 or less when tested in accordance with ASTM-E84. The modified polystyrene core will not burn and does not contain ozone-damaging chlorofluorocarbons (CFC’s) in the manufacturing process of products.
2.5″ polystyrene core with 1.50″ cement each side = 1.5 Hours
2.5″ polystyrene core with 2.00″ cement each side = 2.0.Hours
2.5″ polystyrene core with 3.1/8″ cement each side = 4.0 Hours
The fire rating increases with greater quantities of cement applied to each side. The polystyrene core will not burn.