Pipe Insulation, duct wrap and ventilation insulation. Absolute insulation are specialists is all forms of insulation. Pipe insulation or pipe lagging insulation and ductwrap is a core part of our skills. External ductwrap and pipe insulation products are versatile flexible insulation materials that are designed for the economic external insulation of heating, ventilating and cooling ductwork and pipes. Like all applications of insulation it needs to be installed correctly in order for it to achieve its maximum performance.