Insulating Ductwork In Attic

Repeat to insulate the remaining ducts.

Insulating ductwork in attic.

Unfortunately so many houses especially newer homes end up with ductwork running through the attic. The duct insulation should include a vapor barrier cover. Test total duct leakage. Loose fill or batt the common term for blanket insulation.

Frost king baseboard air deflector extends 15 to 25 in. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. For diy attic insulation you ve got two choices. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct.

Close to 25 of the energy you use to heat and cool your home disappears through leaky ductwork. Wrap the insulation around the duct and then pinch the seam closed. Proper duct insulation is a major key to ensuring your home s energy efficiency. The department of energy claims that the average us home loses hundreds of dollars a year in heating and cooling costs.

Flexible ductwork comes with different insulation r values. In a vented attic this can happen when the duct is in close proximity to conditioned space i e the ceiling and also thermally isolated from the hot attic beneath the ceiling insulation. Sometimes the insulation is inside the ductwork. Length ductwork insulation sleeve r 8.

In this case the temperature gradient between supply air and the ceiling can be such that the duct surface could be cooler than the local dew point. Dia x 5 ft. Other times insulation may be on the outside. Add additional sealant if necessary.

The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. Model f8ds12 23 07. 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. That has kept the ventilator working but ted surmises the high.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. 69 model hd11 6 99. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Mechanically fasten and mastic seal all duct connections.

Both can be added to uninsulated attics or layered over existing material. Apply a long strip of foil tape along the seam in the insulation. Length ductwork insulation sleeve r 8 2 model f8ds10 19 13. Master flow 10 in.

Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Master flow 12 in. Dia x 5 ft.