GreenStuf Roll Form is an insulation blanket suitable for thermal and acoustic insulation of residential buildings. It can be used as a roof blanket, in ceilings, internal and external walls and in mid-floor cavities. GreenStuf Roll Form is also ideal for insulating the ceiling of existing homes. Installed as a blanket it can be simply rolled out over the top of the ceiling joists to create a warmer, drier home in winter and a cooler home in summer. Insulating an older home is the single most effective thing you can do to create a warmer, drier, healthier and more energy-efficient home.