Insulated exterior ducts must be protected with which type of barrier?

When dealing with insulated exterior ducts, it is crucial to consider the environmental elements that can impact their functionality and integrity. A weatherproof barrier is essential because it safeguards the insulation from moisture and other weather-related damages. This helps maintain the efficiency of the duct system by preventing the insulation from becoming wet, which can lead to reduced thermal performance, potential mold growth, and overall deterioration of the insulation material.

Weatherproofing ensures that external temperature fluctuations, humidity, and precipitation do not compromise the insulation or the ductwork itself. Proper barriers are vital in maintaining the longevity and effectiveness of HVAC systems, particularly for those located in areas prone to extreme weather conditions.

While other types of barriers have their specific uses—such as moisture barriers that focus primarily on preventing moisture ingress or fire barriers that serve to help contain and prevent the spread of fire—only a weatherproof barrier is specifically designed to address the challenges faced by exterior ducts directly related to environmental exposure.