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