Are Straw Bale buildings fire proof?

As straw bales are firmly compacted, they do not hold enough oxygen to facilitate combustion. Straw bales exposed to fire will smoulder and char, but will not burn. Typically walls are always plastered which further protects the walls. Extensive fire tests which have been conducted on straw bale structures have proven that a straw bale in-fill wall assembly is a far greater fire-resistant assembly than a wood frame wall assembly using the same finishes.