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Old 01-15-2013, 01:25 AM   #46
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Flex Duct


Well I'm stapling it to the bottoms of the ceiling joists so use mastic where the board meets the wood and the seams?

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Old 01-15-2013, 04:15 AM   #47
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Yes..
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Old 01-15-2013, 04:27 PM   #48
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So I got some Knauf Duct Board at a very good price. However, once I got it home it seems very...fibrous. I run my hand calmly over the fiberglass portion and it feels like i'm scraping off very small particles. Is this normal?

It has the intent of being used as a return plenum so air flow shouldn't be TOO aggressive right?

Is there some kind of guard that I could place over it to prevent that from entering the rest of the house if it is indeed a problem or perhaps a special air filter?

In the picture does this mean that the board was made November 16th 2000?

Does the duct board look in good condition from the pics?
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Old 01-16-2013, 05:19 AM   #49
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Return air flow velocity is suppose to be low, so it shouldn't pick up any fibers.

Nothing you can really put on. they make duct board with a coating already on it, but no coating to put on after the fact.

Yep, its old.
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Old 01-19-2013, 05:25 PM   #50
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Will Titebond Acoustical Sealant work with sealing the duct board?

http://www.titebond.com/product.aspx...c-bcb5e1c603b5
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Old 01-19-2013, 05:45 PM   #51
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I'll be using it on the outside of the duct work to seal to the ceiling joist.
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Old 01-20-2013, 05:09 AM   #52
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Ok got the first return duct board all up and it went surprisingly well for my first time. Really killed the sound and resonance too Now I just have to seal it properly to each other and the wood joists so a couple question so I do it correctly;

1. Should I run a bead of duct sealant caulk the whole length where the yellow fiberglass meets the joist. (It's pretty tight, did a light test and it passed)

2. Should caulk AND tape all the seams or just taping will be fine?

3. My joists aren't perfect and there are 2 gaps where the joist was chiseled and there's about a 1/4" small gap. Just fill with caulk?

4. How would I go about sealing the duct board to the concrete wall and the wood frame on either end of the run?

Thanks to everyone for their help in this.
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Old 01-20-2013, 05:19 AM   #53
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Run a bead of caulk on all seams. Then run a strip of foil tape over top of that and staple the tape to the duct board and wood.

At the concrete end. just caulk.
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Old 01-21-2013, 05:50 PM   #54
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Is this tape good to use?
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Old 01-21-2013, 05:55 PM   #55
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Should work fine.

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