Forced hot air caulk?

[a]

Hi all, I saw a DIY show up here in Canadia (eh) where the HVAC sub was gunning a caulk around the plenum joints and then al taping them.

Any ideas on what they were using to caulk the air plenums?

a

[Joe]

Of all the common caulks, silicone comes to mind for temperatures up to 180-200 degrees F. Long term, most of the other polymers don't have the durability.

Jow

[a]

Yeah, but what about the off-gassing?

a

[Cliff Hartle]

There are many caulk type products for sealing ducts.

[a]

Sweet! Thanks muchly!

a

[Nate Nagel]

yeah, there's silicone on my ductwork. not sure what flavor, i wasn't around when the guy installed it.

nate

[Nate Nagel]

it's just vinegar, nothing to worry about.

nate