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Honestly, I’ve seen both mastic and foil tape fail if the prep isn’t right. Here’s my take:
- Tape’s quick, but yeah, it can peel if the duct’s dusty or gets hot/cold cycles.
- Mastic’s messy, but it’ll outlast tape if you don’t mind the cleanup.
- I’ve had to redo taped joints after a year or two, especially in crawlspaces where moisture’s an issue.
- Sometimes, a combo works best—tape for the seam, mastic over the top.
If you’re worried about leaks causing bigger headaches, I’d lean toward mastic, but only if you’re patient enough to do it right. Otherwise, you’ll just be back at it next season... trust me.
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