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-   -   Replacing Duct Tape Used on HVAC Ducts (http://www.diychatroom.com/f17/replacing-duct-tape-used-hvac-ducts-147271/)

yarrick19 06-16-2012 05:16 PM

Replacing Duct Tape Used on HVAC Ducts
 
Hello,

I moved into a new house about a year ago that has an unfinished basement. Since the area is unfinished, I can see all the HVAC duct work and I noticed that standard duct tape was used to connect some of the duct work together. I realize this is not the proper tape to use as over time it will not provide an adequate seal and I would like to replace it with the appropriate tape or mastic. I have a few questions about doing this:

1 - Most of the existing duct tape is still sticking fine. Can I just go over the top of it with mastic to seal the joints? Or, do I need to try and remove all the duct tape and then seal with the mastic and or metal tape?

2 - Is mastic enough to seal the joints or do I also need to use metal tape? If its best to use both, do you tape first and then apply mastic over the top or the other way around?

I plan on finishing the basement in the near future so I'd like to get everything nice and sealed before I close it up!

Thanks in advance for all the help.
Paul

JJboy 06-16-2012 09:06 PM

Yes, do it....

yarrick19 06-17-2012 10:24 AM

Thanks for the response... but can someone help answer my specific questions?

Thanks!

TarheelTerp 06-17-2012 10:32 AM

Quote:

Originally Posted by yarrick19 (Post 945019)
I have a few questions about doing this:
2 - Is mastic enough to seal the joints or do I also need to use metal tape?

Mastic is perfect all by itself.

Quote:

1 - Most of the existing duct tape is still sticking fine.
Can I just go over the top of it with mastic to seal the joints? Mostly.
Or, do I need to try and remove all the duct tape and then seal with the mastic and or metal tape?
To the largest extent reasonably possible... remove the clothbacked duct tape.
Then put a few extra screws into the joints to stiffen and support.
Then coat everything with mastic. Two coats.

beenthere 06-17-2012 11:39 AM

Quote:

Originally Posted by yarrick19 (Post 945019)
Hello,



1 - Most of the existing duct tape is still sticking fine. Can I just go over the top of it with mastic to seal the joints? Or, do I need to try and remove all the duct tape and then seal with the mastic and or metal tape?

Best to remove he existing duct tape, make sure the joints are mechanically fastened, then mastic the joints.

2 - Is mastic enough to seal the joints or do I also need to use metal tape? If its best to use both, do you tape first and then apply mastic over the top or the other way around?

Mastic only. Unless you have large gaps, then a mesh tape with mastic applied over it.

I plan on finishing the basement in the near future so I'd like to get everything nice and sealed before I close it up!

Thanks in advance for all the help.
Paul

Seal all joints you see, both return and supply. then check to see if your air flow decreased. if so. Your return duct is undersized, and the leaks were providing the additional air the system needed. So you'll need to add a return or 2 in that case.

yarrick19 06-17-2012 11:29 PM

Thanks for the input!


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