Fire, strangely enough, is not really a concern. Moisture is a much bigger enemy to straw walls than fire. (Which is why it is such a concern to get the walls plastered a.s.a.p.)
In 1993, SHB Agra Engineering and Environmental Services Laboratory (New Mexico) undertook a series of fire trials before admitting bale walls into the building code. Plastered bale-wall systerms actually outperformed wood-framed walls in fire tests.
The larger danger regarding fire during construction is the large amount of loose straw created by cutting bales, etc., that can catch fire from burning leftover wood (which we don't do) or from cigarettes that aren't properly extinguished.
In 1993, SHB Agra Engineering and Environmental Services Laboratory (New Mexico) undertook a series of fire trials before admitting bale walls into the building code. Plastered bale-wall systerms actually outperformed wood-framed walls in fire tests.
The larger danger regarding fire during construction is the large amount of loose straw created by cutting bales, etc., that can catch fire from burning leftover wood (which we don't do) or from cigarettes that aren't properly extinguished.