NRG Greenboard™ is an insulated wall panel that combines exterior cladding with insulation properties so designers can achieve the 6 star energy ratings that have been introduced into the building code. NRG Greenboard™ is a high density expanded polystyrene, containing fire and vermin retardant, acheive thermal ratings options from 1.92R to 3.96R,with added advantage of an acoustic rating(RW38 ).