Ecohousing Building Systems has created a unique floor panel system. In elevated and two storey houses, Smartspan® zincalume cladded roof panels are utilized as floor panel with lengths up to 9 metres with 3.6 metre spans. Floor finish is usually yellow tongue screwed to the panel. The weight of the panels, in concert with their structural rigidity, allows for a reduction in total stumps required for elevated houses and very little use of concrete to anchor posts with no interference to the natural terrain. The insulation value is R 5.02 bare and increases with different coverings.