Using a duct sealant called mastic is the professionals choice.
Ac duct sealing in florida attic.
It is a great way to improve indoor air quality and comfort while making your home more efficient.
The air in your vented attic is hot and humid just like all outdoor air in florida.
Use zip ties to secure any loose ducts to the attic floor.
When the hot humid attic air contacts the cold duct or the cold duct boot the moisture in the air condenses on the cold surface just like the condensation that happens on a cold can of beer.
To seal ductwork from the inside.
One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic.
In a vented attic all of that expensive airflow is lost to the environment.
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.
When we seal the attic with spray foam it s as tight as a butter tub.
The 3 will not cause the duct to compress reducing air flow.
Steps to sealing attic air ducts.
Missing or inadequate ductwork insulation works against the hvac system during heating and cooling seasons forcing the hvac system to heat or cool the ductwork before proper temperature air can reach a room.
Hvac costs escalate and some rooms stay too hot or too cold even when the hvac system is operating.
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Locate the source of the thermal leaks by inspecting the ductwork while the air conditioner is running.
Apply a generous amount of sealant mastic over the thermal leak.
Do you need air duct sealing.
Air sealing your ducts is cheap and easy and it save s a lot of money.
There are two main ways to solve this problem.
Sealing ductwork from the inside out is a much more complicated process and will likely require hiring a professional.
Snap a plastic cap onto the duct end to keep the insulation from snagging then slip the pre formed piece over the duct.
Learn how to seal yo.
Having killed the kracken replaced it with ductwork that both performs moves proper cfm of air takes time experience the want to do it right.
Always test duct for air leakage.
Make sure the duct is secure in place and wait for it to dry.
The first step of air sealing is testing the attic to identify where the air leaks are.
The remaining 2 tons of capacity is at least 1 5x oversized for the actual 1 load.
Gently pull the insulation over the entire length of duct.