Sealing Ductwork

Old 03-10-03, 05:23 PM
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Question Sealing Ductwork

Has anyone had the Aeroseal product applied to their ductwork to seal up all the joints? Does it work? Can anyone offer their opinion on the service. I am thinking of having it done to my almost 4yr old house due to not enough airflow, especially in the upstairs rooms.
Old 03-10-03, 05:54 PM
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not sure what you mean

if it over a couple hundred bucks, get some duct sealer ( mastic ) and do it your self.
Old 03-10-03, 07:19 PM
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It is a process where an HVAC company will come in and cover up all your registers and sprays the sealer into your ductwork. It only bonds to holes or gaps in the ductwork - not the whole inside. It can close up gaps up to 5/8". You can look at the website:
This will get to all the ductwork that is hidden behind your walls and in places you could not reach - especially in a two-story house with the furnace in the basement.
Old 03-10-03, 07:40 PM
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Not enough airflow, especially the upstairs rooms sounds more like a poor ductwork design (too large, too small, improper branching, underinsulated causing to much heat loss/gain, overinsulated internally causing flow restrictions and so on), undersized blower or unbalanced airflow.

Check the temperatures coming from the air supply register in each room. If the temps vary more than 4 degrees, then you should investigate further to determine what is causing the problem before you go to the expense of having the ducting sealed. After all you wouldn't want to spend all that money just to find out something else is causing the problem. You can always have the ducting sealed after being sure there isn't another cause or after having another cause corrected.

A few dollars now for a reputable contractor can save you hundreds from another cause, not to mention preserving you from the headaches of a wasted effort.
Old 03-11-03, 09:02 AM
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Thank you for your response. I am in the process of having two HVAC contractors look at the system for ways of improving the airflow upstairs.
Old 01-29-07, 08:36 PM
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k2ski - Did you ever decide to go ahead with the aeroseal of your ducts?
Old 01-29-07, 08:46 PM
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If you want good heat and cool for up and down with open stairs. Go for 2 units in the home. you will save on fuel in the long run.

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