This isn t equivalent to bringing them into the conditioned space as you ll still have additional duct load but it s a lot better than having them in unconditioned attic space.
How to insulate flex ductwork in attic.
The foam provides a vapor barrier so the ductwork.
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Use metal flex or fiber board ducts that are insulated to code.
The flex ducts were literally filled shut with ice in the low spots compressing the scant insulation layer beneath them.
Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket.
By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.
The doe s building america program recommends beds buried encapsulated ducts.
The rigid insulation was saturated from condensation.
Consider adding more insulation as ductwork is farther from the furnace.
Wrapping the duct in a foil faced blanket.
How to insulate the attic air sealing the attic energy saving attic insulation duration.
When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm.
If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.
If your rigid metal ductwork has any insulation it may already have enough.
Mechanically fasten and mastic seal all duct connections.
Tape any punctures in the insulation s vapor barrier to prevent leaks.
Mastic comes in a bucket air duct sealant comes in a tube they re basically the same thing.
If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order.
Spread it around with either your fingers or a disposable chip brush or disposable paint brush.
Use a pressure sensitive vapor retarder tape designed for ductwork.
Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates.
You re throwing money out the window.
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Invest in duct insulation today to safeguard your family s health and your pocketbook.
Avoid compressing the insulation.
The duct insulation should include a vapor barrier cover.
The cost and effort to add more insulation is minimal.
The two most common ways to insulate ductwork are.
Most insulation relies upon the air space between its fibers to deliver the r value promised.
If you need help deciding which type of insulation you need set up an energy consultation.
Stop wasting money and energy with a leaking duct system.
Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.
I found instead a vintage 3 ton ac unit with 1 rigid insulation taped all over it and insulated flex duct snaking all over the poorly insulated attic.
Bury the ducts deeply in insulation.
Applying spray foam insulation to the outside of the duct.
