Bobby & David are having their ceiling insulation replaced at the end of this month, using the Government Subsidy, and are having installed an excellent product, recommended by their installer, which is Knauf Insulation's EarthWool and Ecose Technology. This is made out of glasswool, a sustainable product of recycled glass bottles, more natural ingredients, and the removal of formaldehyde from the binding process.
Some information from their advertising brochure says that unlike other types of ceiling insulation EarthWool is non-combustible. EarthWool is made using recycled glass bottles and sand making it the best choice for enviromentally conscious home owners.
More information can be viewed on their website: http://www.knaufinsulation.co.nz/