Insulating Ductwork In Attic

Apply a long strip of foil tape along the seam in the insulation.

Insulating ductwork in attic.

Test total duct leakage. Repeat to insulate the remaining ducts. Both can be added to uninsulated attics or layered over existing material. The department of energy claims that the average us home loses hundreds of dollars a year in heating and cooling costs.

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. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. 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.

Unfortunately so many houses especially newer homes end up with ductwork running through the attic. Sometimes the insulation is inside the ductwork. Length ductwork insulation sleeve r 8 2 model f8ds10 19 13. Once you ve decided which type is best for you examine the material options and prices to home in on the right product.

Length ductwork insulation sleeve r 8. Mechanically fasten and mastic seal all duct connections. Master flow 12 in. Master flow 10 in.

Other times insulation may be on the outside. Proper duct insulation is a major key to ensuring your home s energy efficiency. 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. For diy attic insulation you ve got two choices.

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. Summer hasn t even arrived he notes in a post at gba s q a forum and when the temperature outside climbs to more than 95 f the temperature in the attic tops 120 f. Loose fill or batt the common term for blanket insulation. Dia x 5 ft.

The duct insulation should include a vapor barrier cover. The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct. That has kept the ventilator working but ted surmises the high.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Dia x 5 ft. Close to 25 of the energy you use to heat and cool your home disappears through leaky ductwork. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Frost king baseboard air deflector extends 15 to 25 in. Add additional sealant if necessary. Secure the insulation with short strips of foil tape.