The flex ducts were literally filled shut with ice in the low spots compressing the scant insulation layer beneath them.
Insulated flex duct in attic.
This additional insulation provides greater thermal efficiency to save energy.
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.
Disconnected or leaking ducts.
Ducts are to be part of what is inside the house not part of.
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.
The master flow 4 in.
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Just blow the attic to r 38 and over the top of ducts if needed.
The lower the cooler it is.
The higher the r value the pricier the ducting.
Blown in insulation is cheap.
The master flow 6 in.
The attic is a hot dirty nasty place.
This additional insulation provides greater thermal efficiency to save energy.
R value of insulated ducts flexible ductwork running in open space like an attic will be insulated from about r6 to r10.
Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates.
Lambro 4 in x 96 in foil.
They just tear through them smash them climb on.
In existing homes with vented attics and hvac ducts that are installed on the attic floor bury ducts in blown attic insulation when adding or increasing attic insulation.
Or excess flex duct.
The higher in the attic the hotter it is.
Insulated flexible duct r6 silver jacket is used in standard heating and air conditioning hvac systems and some venting applications.
However this is a cost that pays for itself quickly so choose higher r values when given an option.
The doe s building america program recommends beds buried encapsulated ducts.
The duct has r6 insulation which contains 33 more insulation than the standard r4 2 product.
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Ducts up high get tore up.
People can not carry ladders up into a attic and them place them onto 1 1 2 wide boards so they can climb over ducts.
The duct has r6 insulation which contains 33 more insulation than the standard r4 2 product.
All the ducts are in the attic.
Looking at the cooling side only the additional load would be.
R 8 duct insulation 5 227 btu hour.
By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.
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Not part of what is in the attic.
Before adding blown insulation inspect and test the ducts for missing or torn duct insulation.
Imperial 8 in x 300 in insulated polyester flexible duct.
