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Replacing air conditioning ducts wrapped in asbestos : Is wet removal a good option?

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David P

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Feb 25, 2002, 9:44:55 PM2/25/02
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We have a 1973 home that has asbestos-wrapped air
conditioning ductowork. We have been advised to replace
the ductwork to more adequately disperse the air-conditioning
(and heating) in the rooms to better balance the airflow,
since they cannot (apparently) vent the old ducts.
The old ducts would be replaced with new fiberglass ducts.
The ductwork runs primarly in the crawlspace above the rooms in the
(single story) home.

The big question: Does this require an asbestos removal company?
Or can it safely be done by masking the vents with plastic, then
wetting the asbestos down, then removing the wet asbestos.
We are (obviously) concerned with making sure no asbestos contaminents
get unleashed in the home. The latter option has been suggested
by a local air conditioning company who have offered to do it.

Is this wet-and-remove process safe and reasonable? Are there any
possible gotchas?

Tangentially: Is there any reason we might not want to make the suggested
upgrade to fiberglass ducts from the current ones?

Thanks much,

David

ameijers

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Feb 25, 2002, 11:35:07 PM2/25/02
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Never seen asbestos duct used in residential forced air in something that
new. How sure are you that it is asbestos? Is it labeled? Did they test it?

As to 'safe' removal- yes, in most cases, a spray bottle to keep down dust,
along with a running vacum collector where they break the old pipe, is safe.
However, in most areas, it ain't legal. Any asbestos removal has to be by a
licensed abatement contractor. Even if you do it yourself, if trash company
notices it in your trash, they will not be happy.

As to the new duct- make sure it is lined duct, not the stuff with the fuzzy
insides. Don't wanna be breathing glas fibers either. Personally, I prefer
galvanized steel duct, but that is just what I am used to. In an uninsulated
attic space, the insulated stuff is the way to go.

aem sends....
David P <da...@zootbuys.com> wrote in message
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Dr. Hardcrab

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Feb 25, 2002, 11:34:43 PM2/25/02
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"> The old ducts would be replaced with new fiberglass ducts.


uh-oh......


CBHVAC

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Feb 26, 2002, 8:06:58 AM2/26/02
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You thought the same thing I did...
More like....oh yea...thats JUST what he needs...ductboard...yay..


"Dr. Hardcrab" <drhar...@hotmail.com> wrote in message
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CBHVAC

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Feb 26, 2002, 8:09:07 AM2/26/02
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"David P" <da...@zootbuys.com> wrote in message
news:23f6f6e6.0202...@posting.google.com...
> We have a 1973 home that has asbestos-wrapped air
> conditioning ductowork. We have been advised to replace
> the ductwork to more adequately disperse the air-conditioning
> (and heating) in the rooms to better balance the airflow,
> since they cannot (apparently) vent the old ducts.
> The old ducts would be replaced with new fiberglass ducts.
> The ductwork runs primarly in the crawlspace above the rooms in the
> (single story) home.

You mean the joints are wrapped in asbestos tape?

>
> The big question: Does this require an asbestos removal company?
> Or can it safely be done by masking the vents with plastic, then
> wetting the asbestos down, then removing the wet asbestos.
> We are (obviously) concerned with making sure no asbestos contaminents
> get unleashed in the home. The latter option has been suggested
> by a local air conditioning company who have offered to do it.

Think about this statement, and then think about your later statement about
fiberglass duct...

>
> Is this wet-and-remove process safe and reasonable? Are there any
> possible gotchas?
>
> Tangentially: Is there any reason we might not want to make the suggested
> upgrade to fiberglass ducts from the current ones?

Little things called fiberglass fibers...for one...
Ductboard...the cheap contractors way out. GARBAGE.

>
> Thanks much,
>
> David


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