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Started By
Message
Need a little AC air sealing advice
Posted on 8/11/24 at 10:31 am
Posted on 8/11/24 at 10:31 am
I’m up in the attic sealing off duct penetrations and notice this refrigerant tubing is missing a grommet. A massive flow of air is coming out of this. I shoved a piece of foam wrap around it in the meantime but it’s still a lot of air.
Any ideas how to seal that off? Are there any reasons not to completely seal it?
Any ideas how to seal that off? Are there any reasons not to completely seal it?
3
Posted on 8/11/24 at 10:47 am to jamiegla1
I would use the foam wrap like you did and then wrap it with duct tape.
Posted on 8/11/24 at 11:55 am to jamiegla1
shove some foam in the whole then use the foil tape to seal it.
Posted on 8/11/24 at 1:18 pm to diat150
Ended up doing both. I think the flow of air out of this one penetration was close to an entire air register.
It’s amazing how poorly sealed the entire plenum? air handler? was. Caulk was degraded. Duct tape falling apart. It’s a bit of work but I’m glad I’m doing it. I didn’t end up using mastic. Figured it would take me longer to complete it and would be paying for it in lost cooling. I just used “mastic backed” foil tape
It’s amazing how poorly sealed the entire plenum? air handler? was. Caulk was degraded. Duct tape falling apart. It’s a bit of work but I’m glad I’m doing it. I didn’t end up using mastic. Figured it would take me longer to complete it and would be paying for it in lost cooling. I just used “mastic backed” foil tape
Posted on 8/11/24 at 8:08 pm to jamiegla1
quote:
It’s amazing how poorly sealed the entire plenum? air handler? was.
Mine was the same way when I looked at it a couple of years ago. 1” gaps in ductwork and plenum just blowing cold air into the attic.
As for the original question, your patch job may hold for a while, but I’d probably try to find the right grommet. A/c supply house has probably got them.
Posted on 8/13/24 at 11:43 pm to jamiegla1
I wouldn't waste my time trying to find the grommets. Use perma-gum putty and seal it up. If you don't have access to an ac supply, just grab this at HomeDepot. Same thing.
Grab some of this at HD
Should look like this when done although this person was a tad generous. Doesn't matter....it's sealed.
You still need to insulate any exposed copper otherwise it will sweat and cause a pretty stain on your ceiling.
Grab some of this at HD
Should look like this when done although this person was a tad generous. Doesn't matter....it's sealed.
You still need to insulate any exposed copper otherwise it will sweat and cause a pretty stain on your ceiling.
Posted on 8/15/24 at 6:54 am to MardiGrasCajun
thats what im talking about. How "perma" is it? Can it be removed by hand? Have to grind it off?
ETA almost bought a block today but it said it was carcinogenic
ETA almost bought a block today but it said it was carcinogenic
This post was edited on 8/15/24 at 8:45 pm
Posted on 8/16/24 at 2:05 pm to jamiegla1
quote:
ETA almost bought a block today but it said it was carcinogenic
It stays pliable.
The SDS says no evidence of carcinogenicity. Not sure where you read it was carcinogenic. Are you referring to the California warning?
I'm in the manufacturing business. All of our products have the California Prop 65 warning on them. Not because they'll cause cancer but because someone in California will sue you if the label isn't on there. The plastic wrapper on that product may be what "may" cause cancer based on the materials used to make it.
There are normal everyday people in California that make a living suing companies because of no warning label. They will go in somewhere like a Home Depot and find a plastic fitting with no label...bam!..lawsuit. They win everytime as the companies always settle.
This post was edited on 8/16/24 at 2:25 pm
Posted on 8/17/24 at 7:53 am to MardiGrasCajun
I didn’t actually look at the one from Home Depot but it looked similar. I believe it was Gardener Bender. It looked like it was meant to seal conduit in a junction box. It did have a Prop 65 label.
Maybe it’s no big deal but the mastics are all pretty clear about being intended for use on air duct and containing no formaldehyde. I just figured the air that we breathe will be passing over that 24/7/365
ETA that’s crazy about Prop 65
Maybe it’s no big deal but the mastics are all pretty clear about being intended for use on air duct and containing no formaldehyde. I just figured the air that we breathe will be passing over that 24/7/365
ETA that’s crazy about Prop 65
This post was edited on 8/17/24 at 8:53 am
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