If your rigid metal ductwork has any insulation it may already have enough.
Add insulation to attic ducts.
Blown in insulation overview.
Properly prepare the attic before adding insulation.
For an added layer of protection you can apply duct mastic to the tape and duct.
The duct insulation should include a vapor barrier cover.
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.
Learn more about this important step here.
The remaining 2 tons of capacity is at least 1 5x oversized for the actual 1 load.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation.
Measure the depth up to the top of the ducts.
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.
Test total duct leakage.
Add additional sealant if necessary.
Pull down stair or ladder.
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.
You can do it yourself for about 500.
If you need to add insulation in your attic save big by blowing in cellulose insulation yourself.
When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.
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.
The cost and effort to add more insulation is minimal.
Use the type of.
Attic hatch or door.
Check with your installer or manufacturer s website or bags to find the recommended depth 2.
You need insulation even around your ducts no matter where you live.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
Don t use standard cloth duct tape on hvac ductwork since the adhesive won t hold up to extreme temperatures.
Consider adding more insulation as ductwork is farther from the furnace.
Mechanically fasten and mastic seal all duct connections.
How much does attic insulation cost.
The pros charge 1 500 to 2 000 to do a 1 200 sq ft.
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.
If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.
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.
Insulation isn t only about keeping heat in.
Then check on the recommended depth for the cellulose insulation planned for the attic.
