The quickest, easiest method of insulating exposed interior water pipes is to use insulating tube made for that purpose. This will help prevent frozen pipe problems caused by prolonged freezing temperatures. Use insulating tube on exposed pipes under the sink, against outer walls, and in the basement.
One great feature of this type insulation is that you do not need to remove it after winter. In fact, leaving the insulating tube on pipes year-round makes your home more energy efficient. It reduces energy used by the water heater to heat cold water. It also reduces noisy pipe sounds.
Interior pipe insulating tubes come in a variety of lengths, diameters, and materials. Therefore, measure length and diameter of pipes before purchasing tubes. Standard-sized residential pipes are ½-inch and ¾-inch.
Insulating tubes are pre-slit down the center; simply place around the pipe, peel off the tape located on both edges, and stick them together as you work your way down the length of the tube.
Use a utility knife to cut the tube to fit the length of pipes, and duct tape to cover seams of connecting tubes. Caulk and/or weather strip around pipe entry points that travel through exterior walls.