[Greenbuilding] embodied energy was Polyiso strength on roof

[Reuben Deumling]

"However, fiberglass and cellulose are not air barriers."

Really? I thought dense pack cellulose was de facto also an air barrier.

On Wed, Dec 10, 2014 at 7:25 AM, conservation architect <
elitalking at rockbridge.net> wrote:

>
> [image: image]
> This source from Ergo’s link seems pretty authoritative.  I was
> disappointed not the see eps on the list.  It does have xps which I expect
> to be much higher carbon footprint than eps because of the price.  Still
> looking for this comparison. I am surprised that fiberglass is so high.  I
> am not surprised that cellulose is so low.  They compared these based on
> R20 square foot.  This is fair for conduction performance.  However,
> fiberglass and cellulose are not air barriers.  Therefore, the improved
> energy performance from this characteristic of the foam products is not
> recognized in this evaluation.
>
> I was impressed by fire video of plaster eps room.  The plaster
> installation surely was the major factor in that result. It was still in
> place after the fire.
>
> I can see the potential for eps plaster panels that could lend itself to
> reconfiguration and long life.  This is the Lego model.
>
> Eli
>
>
>  *From:* ErgoDesk <ergodesk at gmail.com>
> *Sent:* Tuesday, December 09, 2014 6:05 PM
> *To:* Green Building <greenbuilding at lists.bioenergylists.org>
> *Subject:* Re: [Greenbuilding] embodied energy was Polyiso strength on
> roof
>
>  Ok you got me on this one, besides I'm busy trying to save the world,
> but if you want to waste time nickel and dimming yourselves on the constant
> changing numbers here they are. http://goo.gl/FMnYUz
>
> -enjoy the info, just warning you upfront
>
>   http://about.me/StyroHome
>
>
> On Tue, Dec 9, 2014 at 11:33 AM, JOHN SALMEN <terrain at shaw.ca> wrote:
>
>>  Except the density thing and the economic  politics that don't set
>> recycling requirements for paper in na
>> Realistically cellulose insul is like 3%? Of insul  sakes. If that ‎ rose
>> it would be more forests
>>  Sent from my BlackBerry 10 smartphone on the Rogers network.
>>    *From: *Alan Abrams
>> *Sent: *Tuesday, December 9, 2014 09:35
>> *To: *listserv Green Building new
>> *Reply To: *Green Building
>> *Subject: *Re: [Greenbuilding] embodied energy was Polyiso strength on
>> roof
>>
>>
>> John...assuming your assessment is accurate, and that any batch of
>> cellulose has had at least one go-round as Krauthammer columns, then
>> shouldn't the EE value be halved? If so, then it's still high, but more
>> competitive against EPS.
>>
>>
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>
>
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