Can I leave tearing HVAC duct insulation without replacing it?
Leaving exposed insulation or tearing off the inner liner without replacing it is tempting when a full duct replacement costs too much right now. Because the duct is hidden in an HVAC closet, it seems easiest to just leave the gaps as-is, but people are stuck wondering what problems will happen if they ignore it.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Can I leave tearing HVAC duct insulation without replacing it?
- 1leaving the duct as is if the inner liner is securedDid this help you?
- 2hiring a professional to inspect the installationDid this help you?
- 3Scraping out the old inner insulation and wrapping the exterior of the duct with aluminum bubble insulation instead.Did this help you?
- 4Removing the failing material and installing new internal insulation using spray glue.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“And it appears to be the Inner Liner thats tearing off. Can I just remove the entire liner? Without replacing it.”source ↗
“Replacing the whole duct is probably not possible right now as it would cost too much.”source ↗
“if its not normal whats the problem if i just leave it like that? ( its in an hvac closet)”source ↗