Sheep Wool Loft Insulation Installation in Sheffield This property had a room in the loft – meaning effective insulation was the key to creating a comfortable environment for both living and storage. Being a pre-1920s property, it was well-served by the installation of lambswool insulation. After first clearing out the old fibreglass and loose boards in the loft, we cleaned and swept the rest of the room. Following this, we installed 240mm of Sheep Wool with eaves ventilation for superior air flow throughout.The loft itself wasn’t the only thing we insulated in this case – we also did work on the loft door, side walls and ceiling of the dormer window, using Sheep Wool for the door and insulated plasterboard for the side walls.