The pros charge 1 500 to 2 000 to do a 1 200 sq ft.
Add insulation to attic ducts.
Add additional sealant if necessary.
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.
Properly prepare the attic before adding insulation.
If your attic has enough insulation and proper air sealing and your home still feels drafty and cold in the winter or too warm in the summer chances are you need to add insulation to the exterior walls.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
The problem with uninsulated ducts.
Consider adding more insulation as ductwork is farther from the furnace.
You can do it yourself for about 500.
Pull down stair or ladder.
If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.
Don t use standard cloth duct tape on hvac ductwork since the adhesive won t hold up to extreme temperatures.
The cost and effort to add more insulation is minimal.
Test total duct leakage.
Attic hatch or door.
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.
How much does attic insulation cost.
Check with your installer or manufacturer s website or bags to find the recommended depth 2.
If you want to cover metal ductwork.
Insulation isn t only about keeping heat in.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
If your rigid metal ductwork has any insulation it may already have enough.
When it comes to adding duct insulation your monthly savings in utility bills will soon cover the costs especially if you install the insulation yourself.
You need insulation even around your ducts no matter where you live.
Affix rigid foam insulation to the attic side of the hatch or door.
Learn more about this important step here.
In more cases than not a 3 ton ac with the ducts in the attic has a ton or so of load that s just from the location of the ducts in the attic and the associated duct gains leakage etc.
This is more expensive and usually requires a contractor but it may be worth the cost especially if you live in a very cold climate.
Then check on the recommended depth for the cellulose insulation planned for the attic.
Blown in insulation overview.
For an added layer of protection you can apply duct mastic to the tape and duct.
Measure the depth up to the top of the ducts.
Use the type of.
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.
Mechanically fasten and mastic seal all duct connections.
