Insulating Ductwork In Attic

Flexible ductwork comes with different insulation r values.

Insulating ductwork in attic.

Frost king baseboard air deflector extends 15 to 25 in. Length ductwork insulation sleeve r 8 2 model f8ds10 19 13. 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. Both can be added to uninsulated attics or layered over existing material.

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. Apply a long strip of foil tape along the seam in the insulation. Dia x 5 ft. Model f8ds12 23 07.

Wrap the insulation around the duct and then pinch the seam closed. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. Repeat to insulate the remaining ducts.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. That has kept the ventilator working but ted surmises the high. Secure the insulation with short strips of foil tape. Mechanically fasten and mastic seal all duct connections.

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. Length ductwork insulation sleeve r 8. Other times insulation may be on the outside. 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. Test total duct leakage. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Loose fill or batt the common term for blanket insulation.

Sometimes the insulation is inside the ductwork. Master flow 10 in. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Close to 25 of the energy you use to heat and cool your home disappears through leaky ductwork.

The duct insulation should include a vapor barrier cover. The department of energy claims that the average us home loses hundreds of dollars a year in heating and cooling costs. Dia x 5 ft. Proper duct insulation is a major key to ensuring your home s energy efficiency.

Master flow 12 in. 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. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal.