Duct Insulation In Attic

R 8 duct insulation 5 227 btu hour.

Duct insulation in attic.

Air sealing your attic and ducts installing blown cellulose insulation and insulating ductwork will eliminate these problems. Other times insulation may be on the outside. 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. The duct insulation should include a vapor barrier cover.

Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket. When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm. 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. Flexible ductwork comes with different insulation r values.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. All the ducts are in the attic. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Use metal flex or fiber board ducts that are insulated to code.

Because the moving air is in the ductwork for only a short period of time it does not need the insulation r value the attic floor requires. Sometimes the insulation is inside the ductwork.