Insulating Ductwork In Attic

Both can be added to uninsulated attics or layered over existing material.

Insulating ductwork in attic. Test total duct leakage. Dia x 5 ft. Unfortunately so many houses especially newer homes end up with ductwork running through the attic. Length ductwork insulation sleeve r 8 2 model f8ds10 19 13.

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. Repeat to insulate the remaining ducts. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal.

The department of energy claims that the average us home loses hundreds of dollars a year in heating and cooling costs. Master flow 10 in. Loose fill or batt the common term for blanket insulation. 69 model hd11 6 99.

Secure the insulation with short strips of foil tape. Apply a long strip of foil tape along the seam in the insulation. Model f8ds12 23 07. Master flow 12 in.

Other times insulation may be on the outside. 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. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

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. The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. The duct insulation should include a vapor barrier cover. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Flexible ductwork comes with different insulation r values. 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. Mechanically fasten and mastic seal all duct connections. For diy attic insulation you ve got two choices.

Length ductwork insulation sleeve r 8. Proper duct insulation is a major key to ensuring your home s energy efficiency. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Add additional sealant if necessary.

Wrap the insulation around the duct and then pinch the seam closed. Frost king baseboard air deflector extends 15 to 25 in. Once you ve decided which type is best for you examine the material options and prices to home in on the right product.