It is strongly recommended that you do insulate when installing your chimney liner, with either a blanket wrap kit or a pour down insulation mixture of vermiculite and water for liners with little clearance. When you install your liner with the proper insulation, your reline job achieves the UL listing of 1777 Standard, which your insurance company will appreciate.Our insulation kits include all the necessary components to help your reline job pay for itself in efficiency and minimized creosote buildup and stay cleaner longer. A properly insulated chimney will provide warmer flue temperatures. This ability to maintain warm flue gas temperatures will also have a positive effect on draft. The warmer the chimney, the warmer the gas; the warmer the air (gas), the faster it rises, thus creating a much improved draft and maximizing the efficiency of the appliance. By utilizing the increased draft, there is less likelihood of having a back draft or a smelly chimney odor.The insulation will help keep the flue liner cleaner, for longer. Creosote is caused when flue gas condenses. The insulation will help retain the heat inside the flue liner longer, thus preventing the gas from condensing as fast. The main cause of creosote is the incomplete combustion of the wood. Older wood stoves were not meant to burn wood as efficiently as newer EPA approved stoves. Insulating flue liners for older, less efficient stoves will prevent you from having to constantly clean your flue liner.