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Foam over existing duct insulation...?

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Foam over existing duct insulation...? Kenneth 03-20-2008
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Posted by on March 22, 2008, 10:20 pm
On Sat, 22 Mar 2008 10:13:24 -0400, Kenneth


>So, just out of curiosity, might you tell me what your beef
>is?
>
>Sincere thanks,


Absolutely, you're a dumb ass that is not listening to some very good
advice you were given, namely, you are in over your head. Just the
fact that you want to foam your ducts proves it. Several people have
told you why not to do it yet you persist. Let me help you here and
give you the answer you are dying to hear; go ahead and foam away!.
Dumbass.

Posted by Kenneth on March 23, 2008, 7:11 am
On Sat, 22 Mar 2008 19:20:25 -0700, hvac tech wrote:

>On Sat, 22 Mar 2008 10:13:24 -0400, Kenneth
>
>
>>So, just out of curiosity, might you tell me what your beef
>>is?
>>
>>Sincere thanks,
>
>
>Absolutely, you're a dumb ass that is not listening to some very good
>advice you were given, namely, you are in over your head. Just the
>fact that you want to foam your ducts proves it. Several people have
>told you why not to do it yet you persist. Let me help you here and
>give you the answer you are dying to hear; go ahead and foam away!.
>Dumbass.

Hi again,

It is not nearly as simple as you claim...

Though, indeed, some here have suggested that it ought not
be done, others have suggested the opposite.

You seem to believe that those who agree with you are
"correct."

That may be right, but I have no way to know that at this
point.

I tend not to assume that those who yell the loudest are
always correct.

All the best,
--
Kenneth

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

Posted by on March 24, 2008, 5:36 pm
> 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."

Down here in the South they will foam the duct but we have very high
humidity and sweating is a problem. The material your
describing( silver quilted stuff) is a new product that when
installed properly works very well. Are you only spraying the ducts?
It would be well worth it to spray the roof and seal off the attic
completely if you stop the heat lose/gain at the source "the roof"
then you are way ahead of the game on insulating and improving the air
quality in your home by stopping moisture. The insulation sprayed
under the roof in your attic will also make your roof(shingles) last
longer.

Posted by Kenneth on March 24, 2008, 7:36 pm
On Mon, 24 Mar 2008 14:36:02 -0700 (PDT),
csstouffer@gmail.com wrote:

>> 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."
>
>Down here in the South they will foam the duct but we have very high
>humidity and sweating is a problem. The material your
>describing( silver quilted stuff) is a new product that when
>installed properly works very well. Are you only spraying the ducts?
>It would be well worth it to spray the roof and seal off the attic
>completely if you stop the heat lose/gain at the source "the roof"
>then you are way ahead of the game on insulating and improving the air
>quality in your home by stopping moisture. The insulation sprayed
>under the roof in your attic will also make your roof(shingles) last
>longer.

Howdy,

Thanks for your thoughts on all this...

I was surprised by the very last comment you made, because
that is the opposite of the information I have been
receiving from other folks.

One insulation contractor told me that foaming under the
sheathing could void the shingle warrantee.

I certainly don't disagree, but because I have no first hand
knowledge of any of this I would ask how spraying under the
roof could extend the life of the shingles.

All the best,
--
Kenneth

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

Posted by Zyp on March 25, 2008, 11:23 pm
Kenneth wrote:
> On Mon, 24 Mar 2008 14:36:02 -0700 (PDT),
> csstouffer@gmail.com wrote:
>
>> wrote:
>>> 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."
>>
>> Down here in the South they will foam the duct but we have very high
>> humidity and sweating is a problem. The material your
>> describing( silver quilted stuff) is a new product that when
>> installed properly works very well. Are you only spraying the ducts?
>> It would be well worth it to spray the roof and seal off the attic
>> completely if you stop the heat lose/gain at the source "the roof"
>> then you are way ahead of the game on insulating and improving the
>> air quality in your home by stopping moisture. The insulation
>> sprayed under the roof in your attic will also make your
>> roof(shingles) last longer.
>
> Howdy,
>
> Thanks for your thoughts on all this...
>
> I was surprised by the very last comment you made, because
> that is the opposite of the information I have been
> receiving from other folks.
>
> One insulation contractor told me that foaming under the
> sheathing could void the shingle warrantee.
>
> I certainly don't disagree, but because I have no first hand
> knowledge of any of this I would ask how spraying under the
> roof could extend the life of the shingles.
>
> All the best,
> --
> Kenneth
>
> If you email... Please remove the "SPAMLESS."

I'd think that sealing under the shingles prevents the moisture from
escaping. But I'm not a roofer and really don't know.

--
Zyp



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