Which type of insulation material is commonly used for ductwork?

Foam insulation is commonly used for ductwork because of its excellent thermal resistance properties and its ability to effectively prevent condensation. It reduces energy losses by minimizing heat transfer, which is crucial in maintaining the efficiency of HVAC systems. Foam insulation is often lightweight, easy to install, and can be applied to a variety of duct types, which enhances its versatility in various HVAC applications.

In contrast, paper products do not provide adequate insulation for thermal or moisture control in ductwork and can degrade over time, making them unsuitable. Concrete lacks the necessary insulating properties and is impractical for use in ductwork due to its weight and bulk. Wood shavings, while organic, do not provide consistent insulation and can attract pests, leading to potential complications in HVAC systems. Thus, foam insulation stands out as the appropriate choice for ductwork insulation in HVAC systems.