UNIPUR GFB is a self-supporting roof panel with a 12.5mm water-resistant chamfered gypsum fibreboard fixed to three timber afters. The gypsum fibreboard is non-combustible, class O to UK and Irish Building Regulations. Where boards are to be plastered, glue is required to edges. -The space between the rafters is filled with polyisocyanurate (PIR). -Rafter depth depends on insulation thickness. -The treated rafters are glued and fixed with 6 galvanized nails per metre. -For panels with rafter height of 170mm and above, it is recommend to skim the inner board.