Which application is deemed best for subslab heating ducts?

Foam insulation is considered the best application for subslab heating ducts due to its effective insulating properties. It provides a high R-value, meaning it offers excellent thermal resistance, which is crucial for maintaining the efficiency of heating systems. This type of insulation minimizes heat loss from the ducts, ensuring that the warm air generated reaches the intended spaces without significant thermal loss. Furthermore, foam insulation can easily adapt to the irregular shapes and spaces typically found in subslab installations, providing a comprehensive barrier that prevents air leaks and moisture ingress. This adaptability contributes to both energy efficiency and the longevity of the heating system, making foam insulation the optimal choice for this specific application.