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Polyurethane structural foam (PUR) which is what Ecohousing Building Systems use, should not be confused with the inferior expanded polystyrene foam (EPS).
Expanded polystyrene foam (EPS) is a dangerous product to use in any structure, it posses great fire risk even when it is treated with a so called “retardant”, examples of the fire risk include. Tip Top Bread complex fire in 2002 causing $100million damages, the $8 million Detention centre fires in 2002, the Queensland Polystyrene Panel fire in a meat processing plant in 2001 causing an approximately $25 million in damages and the biggest fire in NZ the Poultry Abattoir in 2007 causing approx. 100 million dollars in damages. Polyurethane structural foam is a thermosetting material, which means it will not melt, flow or drip when exposed to fire. (Source: NSW Fire Brigades)
Expanded polystyrene foam (EPS) not only posses a fire risk but is also targeted by vermin and insects. It has been found in roof panels that ants have eaten holes in the core weakening the roof panel. It will also melt when exposed to a hydrocarbon (fuel, insect spray etc.) This will not happen to polyurethane. See our vermin resistance PDF
Polyurethane structural foam is the space-age insulation used in passenger jetliners for the past 55 years, making it possible for aircraft to fly at great heights and in temperatures in excess of minus 50 degrees centigrade. It is inert and has a closed cell homogenous structure that is fire retarded with no oxygen to carry flames, retaining its insulation values throughout its life, which to date has been checked at ages greater than 50 years without deterioration or delimitation. It is used in domestic refrigerators where the freezer section is normally at minus 22ºC, of course our insulation section is much thicker in our wall, roof and floor panels, giving exceptionally high insulation values. Polyurethane also has a very high fire resistance and will not burn.
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