If the air duct isn t long enough it is possible to add extra length.
Diy attic ductwork.
By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.
Wrap the insulation around the duct and then pinch the seam closed.
It was new when the ac was put in 7 years ago.
To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct.
Test your co detectors to alert you to any carbon monoxide problems.
I called out the original hvac company and they took a look and said they saw no water.
Secure the insulation with short strips of foil tape.
Each register should have its own damper that can be accessed for adjustment.
Cost of installation supplies.
Remember that article i wrote about ducts installed against the roof deck and how i said it was probably the absolute worst single location for installing ducts.
Loose fill or batt the common term for blanket insulation.
Possibly in an unfinished basement.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
Diy duct sealing only.
Repeat to insulate the remaining ducts.
Well if they re not properly sealed they are stealing money from you.
Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates.
Apply a long strip of foil tape along the seam in the insulation.
When repairing or installing ductwork always consult an hvac professional first.
The doe s building america program recommends beds buried encapsulated ducts.
You all have duct work either in your attic or crawlspace or something like that.
Attach a second air duct to the first by peeling back the insulation.
Here are the itemized costs for the most common types of ductwork and supplies needed to complete installation.
The attic ductwork is flex duct work.
Adding heat runs in a basement may change the airflow in the ductwork going to other rooms.
Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water.
Both can be added to uninsulated attics or layered over existing material.
1 10 5 25 per foot insulated flexible duct 4 to 16 diameters used as branches or in radial duct attic systems 2 30 13 00 per foot round and oval sheet metal duct 3 to 8 diameters typically used for trunks in small homes and.
Well in the comments dave roberts a senior engineer at the national renewable energy lab nrel wrote about a paper he co authored last year and included a link to it.
Run the new flexible air duct under the house from the floor return to the underside of the air handler and attach to the metal vent box or plenum image 1.
If those dampers can t be accessed from below you ll want to install them close enough to the register so that you can reach them through the register opening.
Only qualified contractors should perform changes to your duct system.
Duct sealing by michael church here and in this video we re going to show you how and why it s very important to air seal the run of the ductwork.
Make sure your ductwork insulation has a proper vapor barrier to avoid mold and moisture problems.
Remove existing ductwork where needed.
