What type of barrier must insulated exterior ducts be protected with?

Insulated exterior ducts must be protected with a weatherproof barrier. This requirement ensures that the ducts are shielded from external environmental elements, such as rain, snow, and moisture, which can compromise the integrity of the insulation and lead to deteriorated performance. Weatherproof barriers help in maintaining energy efficiency by preventing heat loss or gain and protecting the insulation material from becoming wet and losing its thermal resistance properties.

Such barriers are critical in maintaining the overall efficiency and effectiveness of the HVAC system, as moisture intrusion can lead to issues such as mold growth or corrosion, which can have further implications for health and maintenance. Properly protecting insulated ducts with a weatherproof barrier ensures compliance with building codes and extended durability of the ductwork.