Insulating Ductwork In Attic Venting

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.

Insulating ductwork in attic venting.

We insulate the bath vent ductwork to minimize the condensation that will otherwise occur as warm moist bathroom exhaust air. 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. Model f8ds14 27 86. Just as is the case with insulation in other parts of your home you should regularly inspect and maintain the insulation on your duct work.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. L x 16 in. Ted also has inherited a powered attic ventilator. Why is condensation on ductwork a problem.

When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Secure the insulation with short strips of foil tape. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct. For diy attic insulation you ve got two choices.

The master flow 6 in. W insulation wrap. Unitherm univest insulation jacket high temperature 25 in. Insulate the bathroom exhaust vent fan ducts.

Wrap the insulation around the duct and then pinch the seam closed. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Length ductwork insulation sleeve r 8. Loose fill or batt the common term for blanket insulation.

So water is condensing on your ac ducts. Why is this a problem. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. First water dripping off of your ducts and onto your insulation can cause the insulation to compress which decreases it s r value or ability to insulate.

Repeat to insulate the remaining ducts. The duct has r8 insulation which contains 50 more insulation than the standard r4 2 product. In un conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct. Insulated flexible duct r8 silver jacket is used in standard heating and air conditioning hvac systems and some venting applications.

Master flow 14 in. Apply a long strip of foil tape along the seam in the insulation. This additional insulation provides greater thermal efficiency to save energy. Hercules see all.

If the insulation around your vent hood duct work becomes waterlogged because of a roof leak or similar problem the insulation s effectiveness will be compromised. Both can be added to uninsulated attics or layered over existing material.