What type of insulation can prevent condensation in ductwork?

Fiberglass insulation is particularly effective in preventing condensation in ductwork due to its thermal resistance properties and moisture control capabilities. When ductwork is insulated with fiberglass, it helps maintain the temperature of the air within the ducts, preventing it from cooling down to the point where condensation could form when it comes into contact with warmer, humid air outside of the ducts.

This type of insulation does not absorb moisture, allowing it to keep the duct temperature stable and reducing the risk of moisture build-up. Properly installed fiberglass insulation creates a barrier that not only minimizes heat loss or gain but also protects the ductwork from the negative effects of humidity, therefore reducing the chances of condensation occurring.

Other types of insulation, while they may provide thermal resistance, may not share the same effectiveness in moisture management. For instance, reflective insulation works well in radiant heat barriers but is not as effective at preventing condensation. Spray foam insulation, although excellent for sealing entire spaces and preventing air leaks, can sometimes trap moisture if not applied correctly. Similarly, cellulose insulation, made from recycled paper products, can absorb moisture, which can lead to potential issues with mold and condensation. Thus, fiberglass insulation stands out for its performance in preventing condensation in ductwork.