What about open fire?
Strawbales once erected and rendered are highly fireplace immune. The tight dense bales with the 36mm coating of what's predominately sand (with cement, clay, lime or other additives) are in circumstances where there is minimal oxygen within them and incredibly little air that can flow in to the wall. Setting hearth to a completed strawbale wall is like getting rid of a telephone booklet, it isn't until the wall structure is torn aside and air is open to feed the flames does it lose freely.
Building in bush fireplace areas- Strawbale development can adequately meet the Australian Standard (AS 3959) building in bush flames prone areas, up to modest risk. Strawbale properties in high bush hearth risk areas at the moment need additional building requirements, and in such cases strawbales provide insulation only. We have caused CSIRO to check lots of strawbale wall samples up to and beyond certain requirements (of 29kw/m2). Building with strawbales in extreme bush fireplace risk areas, (according to AS 3959) is approved over a case-by-case basis. The successful hearth test outcomes from CSIRO (of 29 kw/m2 or increased) have considered strawbale the right construction materials in average bush flame areas.
Fire rated engineering- while international test outcomes give strawbale wall space a 4-hour flames rating, there may be resistance to agreeing to this in Australia without duplicating the checks here. We will as a business continue steadily to carry out tests in Australia. Any building requiring a fire rated boundary, party, or other fire rated wall might need to consider additional or other construction options to be able to meet these requirements.
My name is Mariana and I have an avid passion for Straw Home construction and Tiny Homes that are affordable and eco friendly.