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Old 04-26-2010, 07:03 PM   #1
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What is on my ducts?


2 (only 2, that's the strange thing) of my ducts in the basement are covered in this stuff. I'ts got duct tape covering most of the "stuff in question".

Is it some sort of insulation?

Question number 2 rapidly becomes: Should I be worried? My house was built in 1930 - did they use asbestos for duct insulation?

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Old 04-26-2010, 07:07 PM   #2
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What is on my ducts?


Yes, they did use asbestos for duct insulation.

And it looks like someone is using duct tape to hold that asbestos insulation up.

If it comes loose. You should have it removed.

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Old 04-26-2010, 07:08 PM   #3
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What is on my ducts?


looks like rigid foam and duct tape. Just a note... duct tape is not used for ductwork since the glue dries over time and the hold is not permanent. Ducts should be sealed with mesh tape and duct mastic. I would be more concerned to find and seal all leaks in your ducts.
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Old 04-26-2010, 07:11 PM   #4
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What is on my ducts?


So weird - why would it only be on 2 ducts?

That means either it was:
A: Never on the other ducts in the first place
B: Someone removed or HAD it removed on the other ducts.

Both possibilities seem strange to me!!


Quote:
Originally Posted by Bob Mariani View Post
looks like rigid foam and duct tape. Just a note... duct tape is not used for ductwork since the glue dries over time and the hold is not permanent. Ducts should be sealed with mesh tape and duct mastic. I would be more concerned to find and seal all leaks in your ducts.
No concern for Asbestos?
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Old 04-26-2010, 07:22 PM   #5
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What is on my ducts?


picture is not clear enough to give a correct answer. And that would have to be tested at a lab. But I have never seen any asbestos installed on ducts, maybe steam pipes but that is it. it is possible someone patched the duct with this material. The tape will not last so remove it and see what you have.
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Old 04-26-2010, 07:25 PM   #6
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What is on my ducts?


is return or supply? if return maybe it is the duct
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Old 04-26-2010, 08:46 PM   #7
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What is on my ducts?


Quote:
Originally Posted by Bob Mariani View Post
But I have never seen any asbestos installed on ducts, .
Quite common to find asbestos on ducts here on older duct systems.
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Old 04-26-2010, 09:37 PM   #8
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What is on my ducts?


Quote:
Originally Posted by beenthere View Post
Quite common to find asbestos on ducts here on older duct systems.
Same here. Sometimes whole sections were coated and other places just the joints are wrapped.
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Old 04-27-2010, 04:01 PM   #9
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What is on my ducts?


I'll take a closer picture of a section that has more of the "stuff" exposed later.

The duct tape cracked me up though ... seriously ... I know it's called duct tape but ......... seriously?
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Old 04-27-2010, 10:24 PM   #10
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What is on my ducts?


Usage on ductwork

To provide lab data about which sealants and tapes last, and which are likely to fail, research was conducted at Lawrence Berkeley National Laboratory Environmental Energy Technologies Division. Their major conclusion was that one should not use duct tape to seal ducts (specialty tapes are available for this purpose). (They defined duct tape as any fabric-based tape with rubber adhesive.) The testing done shows that under challenging but realistic conditions, duct tapes become brittle and may fail.
From: http://en.wikipedia.org/wiki/Duct_tape


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