For larger holes filler material may be needed.
Sealing ductwork in attic.
Gently pull the insulation over the entire length of duct.
Sealing your ductwork can shave 20 off your energy bills.
Make sure the duct is secure in place and wait for it to dry.
Steps to sealing attic air ducts.
Sealing ductwork is an easy diy project you can do this weekend.
Locate the source of the thermal leaks by inspecting the ductwork while the air conditioner is running.
I called out the original hvac company and they took a look and said they saw no water.
To seal ductwork from the inside.
Apply a generous amount of sealant mastic over the thermal leak.
Seal fireplace and furnace holes.
The attic ductwork is flex duct work.
Seal attic floor holes.
Snap a plastic cap onto the duct end to keep the insulation from snagging then slip the pre formed piece over the duct.
To seal these openings use caulk or spray foam.
It s easy to overlook electrical wires ducts pipes and vents in the attic but the openings around these are holes can compromise the air sealing of your attic.
I ll show you how to find leaks and seal them in the how to video.
Use zip ties to secure any loose ducts to the attic floor.
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.
Sealing ductwork from the inside out is a much more complicated process and will likely require hiring a professional.
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