Sealing HVAC Ducts in Basement


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Old 12-08-07, 05:24 AM
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Sealing HVAC Ducts in Basement

I've noticed that the ducts from my HVAC units in the basement definitely have small leaks and even some visible gaps in them as they run through the basement to/from the rest of the house.

I saw some different kinds of duct tape at Home Depot. Also some of that foaming spray.

What's the best method to both detect and seal off these areas? I can't imagine how inefficient my two HVAC units must be, and the extra costs as a result.
 
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Old 12-08-07, 07:06 AM
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If this is a conditioned basement it will save you no money to seal the holes. If it is not conditioned duct seal is the best way.
 
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Old 12-08-07, 07:12 AM
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airman, is the "duct seal" you speak of the semi-liquid/pasty compound that is painted on with a brush?

(not sure the OP knows what you mean and this gets you to explain)

Also, where would one get that stuff. I do not remember the typical home supply stores with it.

If that is the stuff airman speaks of, it is the only way to roll. does a fantastic job.
 
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Old 12-08-07, 07:42 AM
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Airman - thanks. the basement is not conditioned. unfinished.

Nap - yep, your right. I thought Airman mean the duct tape stuff in HD.

So this stuff is liquid, huh? It's specifically called "Duct Seal"?

EDIT: Is this it?
https://www.homenetworksupply.com/pr...ac=4&zmap=DX-1
 
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Old 12-08-07, 11:07 AM
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No, that is a putty for filling holes and such. You want a mastic sealant. Something like is shown in this image

ca't tell you what brand is best. I'm a sparky, not a tin knocker. although that pic does not show the stuff I see the commercial guys use that seems to work very well.

the stuff I see used is kind of a dark gray/green ooey gooey stuff that can be applied with a brush. It does an excellent job.
 
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Old 12-09-07, 06:19 AM
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Yes Ductseal like in the picture! Can buy at any HVAC company/store.
 
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Old 12-10-07, 07:24 PM
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In commercial jobs I see the tinner's use the stuff you put on with a brush. Has a bit of stretch and gets into cracks. Or the metal tape. That stuff is really sticky and strong!
 
 

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