[Greenbuilding] embodied energy was Polyiso strength on roof

[Norbert Senf]

I found the post "comparing 8 cold climate walls" on Dec 4 illuminating.
Better to compare total lifecycle greenhouse gas emissions of a house using
a specific wall (or roof) assembly, which includes the
EE........................Norbert

On Tue, Dec 9, 2014 at 10:49 AM, John Salmen <terrain at shaw.ca> wrote:

> I’ve tried to work with embodied energy figures in design and it is really
> difficult to get accurate units and make truly defensible decisions.
> Cellulose for example does not use the energy of making the newsprint or
> the wood it came from – and if it is removing paper from the recycled paper
> stream then it has to share that cost or simply be calculated as if it were
> a virgin material. EE of paper making is about 9300 btu/lb and the wood
> itself 7700 btu/lb so 17000 btu/lb. Total life cycle on paper has been
> calculated at 19400 btu/lb.
>
>
>
> EE is calculated in terms of weight and cellulose can be 2-3x the density
> of foams so total density in a home can be significant in comparison to
> foam usage – so I’m not sure what is being greenwashed. This is not a
> defense of EPS just a comment on how difficult it is to determine the
> correct usage of a material.  My suspicion is that mineral wool (given the
> absence of wool wool in the market) might be realistically the lower EE
> product but produces significant CO2.  The following article supports
> rockwool as consuming less energy than paper wool in production
> http://www.rockwool.it/files/RW-IT/LCA/StudioComparativoLCA-2parte.pdf
>
>
>
> Dogs breakfast
>
>
>
>
>
>
>
>
>
> *From:* Greenbuilding [mailto:
> greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of *Gennaro
> Brooks-Church - Eco Brooklyn
> *Sent:* December-08-14 3:39 PM
> *To:* Green Building
> *Subject:* Re: [Greenbuilding] Polyiso strength on roof
>
>
>
> Although the greenwashing on EPS is strong. It has huge amounts of
> embodied energy. I have not done the calcs (vs. wood and cellulose for
> example) but that very large amount of embodied energy needs to be
> mentioned and taken into account.
>
> ·         Cellulose: 600 BTU
>
> ·         Mineral wool: 2,980 BTU
>
> ·         Fiberglass: 4,550 BTU
>
> ·         Polyisocyanurate: 14,300 BTU
>
> ·         EPS: 18,000 BTU
>
>
> Gennaro Brooks-Church
> Director, Eco Brooklyn Inc.
> Cell: 1 347 244 3016 USA
> www.EcoBrooklyn.com
> 22 2nd St; Brooklyn, NY 11231
>
>
>
> On Mon, Dec 8, 2014 at 5:34 PM, Gennaro Brooks-Church - Eco Brooklyn <
> info at ecobrooklyn.com> wrote:
>
> , ErgoDesk <ergodesk at gmail.com> wrote:
>
> Build the entire House from EPS http://goo.gl/bpmmmJ
>
>
>
> I love this. Amazing.
>
>
>
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-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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