Ductwork Buried In Insuation Attic

Starting with the 2018 iecc buried ductwork will be explicitly allowed in the attic.

Ductwork buried in insuation attic.

When hvac ducts are installed in a vented attic in any climate encapsulate the hvac ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Data from doe s building america program shows buried ducts can save more energy than a home with vented attics and ccspf below the roof. Attic insulation covers buries the ducts. Rating is available when the video has been rented.

Yes when you bury ducts in attic insulation in a humid climate you increase the risk of water vapor condensation on the jacket of the duct insulation. Putting a furnace in an attic is not ideal but will happen. In a hot humid climate moisture can condense on cool ducts and register boots when the air conditioning system is blowing cool air through the ducts. This feature is not available right now.

The interactive transcript could not be loaded. They found r 8 duct insulation was sufficient to prevent condensation. If you re following the performance path your calculations can treat buried ductwork as being insulated to r 25 as long as it s covered by an r 19 layer of insulation in addition to the r 8 duct wrap. Let s look for constantly improving methods through sharing.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. In fact the data from the doe report excerpted below shows deeply buried ducts are 20 30 more efficient than an unvented attic system. Ducts buried under insulation in a vented attic is a viable builder practice option 20 ducts placed on the ceiling drywall or over the bottom truss chords. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Must consider condensation in humid climates. Hvac ducts buried within ceiling insulation in a vented attic buried ducts duct leakage. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Reduces thermal losses from ducts located in vented attics.

Hvac ducts should be buried under insulation hard covered too. The added insulation shields the ducts from temperature extremes.