Originally Posted by yarrick19
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.
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.