Wrap the insulation around the duct and then pinch the seam closed.
Insulating ductwork in attic venting.
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.
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.
Both can be added to uninsulated attics or layered over existing material.
To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct.
We insulate the bath vent ductwork to minimize the condensation that will otherwise occur as warm moist bathroom exhaust air.
Ted also has inherited a powered attic ventilator.
Insulate the bathroom exhaust vent fan ducts.
Secure the insulation with short strips of foil tape.
Loose fill or batt the common term for blanket insulation.
The master flow 6 in.
When water condenses and drips into your attic or home it can cause a some serious secondary problems.
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.
When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.
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.
Length ductwork insulation sleeve r 8.
Apply a long strip of foil tape along the seam in the insulation.
Dia x 5 ft.
Unitherm univest insulation jacket high temperature 25 in.
W insulation wrap.
Why is condensation on ductwork a problem.
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.
This additional insulation provides greater thermal efficiency to save energy.
Hercules see all.
Why is this a problem.
Insulated flexible duct r8 silver jacket is used in standard heating and air conditioning hvac systems and some venting applications.
So water is condensing on your ac ducts.
Repeat to insulate the remaining ducts.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
L x 16 in.
Master flow 14 in.
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.
Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.
The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago.
