Insulating Ductwork In Attic

The duct insulation should include a vapor barrier cover.

Insulating ductwork in attic.

Wrap the insulation around the duct and then pinch the seam closed. Model f8ds12 23 07. 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.

Apply a long strip of foil tape along the seam in the insulation. Loose fill or batt the common term for blanket insulation. Both can be added to uninsulated attics or layered over existing material. Length ductwork insulation sleeve r 8 2 model f8ds10 19 13.

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. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. For diy attic insulation you ve got two choices.

Master flow 12 in. Unfortunately so many houses especially newer homes end up with ductwork running through the attic. Test total duct leakage. Length ductwork insulation sleeve r 8.

When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Dia x 5 ft. Dia x 5 ft. Other times insulation may be on the outside.

The department of energy claims that the average us home loses hundreds of dollars a year in heating and cooling costs. Sometimes the insulation is inside the ductwork. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct. 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.

Close to 25 of the energy you use to heat and cool your home disappears through leaky ductwork. Repeat to insulate the remaining ducts. 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. 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.

Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Proper duct insulation is a major key to ensuring your home s energy efficiency. That has kept the ventilator working but ted surmises the high. Master flow 10 in.

Mechanically fasten and mastic seal all duct connections. Flexible ductwork comes with different insulation r values. Frost king baseboard air deflector extends 15 to 25 in.