When repairing or installing ductwork always consult an hvac professional first.
Diy attic ductwork.
Loose fill or batt the common term for blanket insulation.
It was new when the ac was put in 7 years ago.
For diy attic insulation you ve got two choices.
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.
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.
Well if they re not properly sealed they are stealing money from you.
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.
Make sure your ductwork insulation has a proper vapor barrier to avoid mold and moisture problems.
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.
Apply a long strip of foil tape along the seam in the insulation.
Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates.
The doe s building america program recommends beds buried encapsulated ducts.
Attach a second air duct to the first by peeling back the insulation.
Both can be added to uninsulated attics or layered over existing material.
Install dampers at the registers to adjust airflow.
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.
The attic ductwork is flex duct work.
Possibly in an unfinished basement.
Adding heat runs in a basement may change the airflow in the ductwork going to other rooms.
Secure the insulation with short strips of foil tape.
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.
To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct.
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.
Each register should have its own damper that can be accessed for adjustment.
Cost of installation supplies.
Up against the deck may be the worst place in the attic to.
Repeat to insulate the remaining ducts.
By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.
Remove existing ductwork where needed.
You all have duct work either in your attic or crawlspace or something like that.
Only qualified contractors should perform changes to your duct system.
Here are the itemized costs for the most common types of ductwork and supplies needed to complete installation.
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.
