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.
Ac duct sealing in florida attic.
Snap a plastic cap onto the duct end to keep the insulation from snagging then slip the pre formed piece over the duct.
Purchase duct mastic https.
It is a great way to improve indoor air quality and comfort while making your home more efficient.
The result will be a much more efficient and comfortable home because your hvac system won t need to run as long to get the house to the temperature you want.
Always 90 degree ells at supply boxes.
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.
Locate the source of the thermal leaks by inspecting the ductwork while the air conditioner is running.
The 3 will not cause the duct to compress reducing air flow.
Use zip ties to secure any loose ducts to the attic floor.
Hvac costs escalate and some rooms stay too hot or too cold even when the hvac system is operating.
Always test duct for air leakage.
When we seal the attic with spray foam it s as tight as a butter tub.
Once we know we use an expanding foam to seal the areas and prevent air transfer.
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.
The remaining 2 tons of capacity is at least 1 5x oversized for the actual 1 load.
Steps to sealing attic air ducts.
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.
The air in your vented attic is hot and humid just like all outdoor air in florida.
Gently pull the insulation over the entire length of duct.
To seal ductwork from the inside.
Air sealing your ducts is cheap and easy and it save s a lot of money.
The first step of air sealing is testing the attic to identify where the air leaks are.
Using a duct sealant called mastic is the professionals choice.
Sealing ductwork from the inside out is a much more complicated process and will likely require hiring a professional.
Apply a generous amount of sealant mastic over the thermal leak.
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.
Do you need air duct sealing.
Make sure the duct is secure in place and wait for it to dry.
