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Foam over existing duct insulation...?

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Subject Author Date
Foam over existing duct insulation...? Kenneth 03-20-2008
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Posted by Kenneth on March 20, 2008, 7:04 am

Howdy,

We have a geo water to air system with ducts running through
an unconditioned attic.

The ducts are not sealed, but they are (very modestly)
insulated with a shiny, "quilted" looking product.

We are soon to foam over them, but...

There are two different approaches in the bids we have:

One wants to remove the quilted stuff, and then foam over
the bare metal of the ducts.

The other wants to foam over the existing insulating
material.

What would you suggest in this regard, and why?

Sincere thanks,
--
Kenneth

If you email... Please remove the "SPAMLESS."

Posted by on March 20, 2008, 9:46 am
On Thu, 20 Mar 2008 07:04:38 -0400, Kenneth

>
>Howdy,
>
>We have a geo water to air system with ducts running through
>an unconditioned attic.
>
>The ducts are not sealed, but they are (very modestly)
>insulated with a shiny, "quilted" looking product.
>
>We are soon to foam over them, but...
>
>There are two different approaches in the bids we have:
>
>One wants to remove the quilted stuff, and then foam over
>the bare metal of the ducts.
>
>The other wants to foam over the existing insulating
>material.
>
>What would you suggest in this regard, and why?
>
>Sincere thanks,

Have then foam between your ears while they are at it as the space
there is obviously empty.

Posted by Old & Grumpy on March 20, 2008, 12:29 pm
AS long as your origimal insulation is OK I would no see
the reason for removing it
tony

>
> Howdy,
>
> We have a geo water to air system with ducts running through
> an unconditioned attic.
>
> The ducts are not sealed, but they are (very modestly)
> insulated with a shiny, "quilted" looking product.
>
> We are soon to foam over them, but...
>
> There are two different approaches in the bids we have:
>
> One wants to remove the quilted stuff, and then foam over
> the bare metal of the ducts.
>
> The other wants to foam over the existing insulating
> material.
>
> What would you suggest in this regard, and why?
>
> Sincere thanks,
> --
> Kenneth
>
> If you email... Please remove the "SPAMLESS."



Posted by Kenneth on March 20, 2008, 12:52 pm
On Thu, 20 Mar 2008 16:29:14 GMT, "Old & Grumpy"

>AS long as your origimal insulation is OK I would no see
>the reason for removing it
>tony

Hi Tony,

The original stuff is in fine condition, and it seemed to me
that there was little reason to waste whatever R value it
was providing.

Sincere thanks for your comments,
--
Kenneth

If you email... Please remove the "SPAMLESS."

Posted by Stormin Mormon on March 20, 2008, 7:00 pm
Probably less labor to foam over. And the R-value is added.

I'd say leave the old stuff.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.


On Thu, 20 Mar 2008 16:29:14 GMT, "Old & Grumpy"

>AS long as your origimal insulation is OK I would no see
>the reason for removing it
>tony

Hi Tony,

The original stuff is in fine condition, and it seemed to me
that there was little reason to waste whatever R value it
was providing.

Sincere thanks for your comments,
--
Kenneth

If you email... Please remove the "SPAMLESS."



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