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GSBN: Digest for 11/4/02

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     by jc10508@...
-> RE: GSBN:
     by "Martin Oehlmann" martin.oehlmann@...


Date: 4 Nov 2002 13:43:02 -0600
From: jc10508@...

Dear Martin, dear balers
I tried to send this email to the GSBN-list, but I dont know, if I am still
listed, because it came back.
So I do it this way, maybe its interesting for the European list too.

Responding to your idea to compare common building-products (insulation),
here is our calculation based on
* prices from local building-markets
* declarations and tests from insulation-manufacturers
* the values, Holger Konig (a well known Baubiologist in Germany) describes
in his books (e.g. "Das Dachgeschob", Okobuch-Verlag)
* added by the calculations concerning production energy with the help of
Gerd Zwieners book "Okologisches Baustoff-Lexikon" (C.F.Muller).

(European) terms:
You know: Lambda L= W/mK describes the amount of warmth going through a 1m
thick material in 1 second per squaremeter, when the temp-difference is
(=1#161#C); the lower L is, the better the insulation-capacity. L depends and
differs with the amount of waterdamp, which is in the material, so each
organic material has to have a 20% addiction to
LRTr10 (new after CEN = LNTr10): insulation value (Lambda) for a dry (tr)
material at a temperature of 10#161#C (for 1m, so L never depends on thickness
of wall)
k-value (new after CEN: U-value): k= W/m2K (Warmedurchgangskoeffizient, dont
know the english word), depends on the thickness of the wall
PEI: amount of energy to manufacture/transport/.. a matarial

1) comparison of values

material        L      LRtr10         raw-weight    included prod-energy
            (W/m2K)                     kg/m3           (PEI: kWh/m3)

strawbales   0,045     0,038            100             5-30
                       (as proved in our official tests in Austria)

cellulose    0,045     0,038            35-70           110-190
(made from 80% newspaper)

EPS-W15      0,038     0,038            15-30           400-1.050
(polystyrol-plates: XPS or EPS)

XPS            0,020-0,035              15-30           400-1.050

fibreglass   0,038     0,038            100             100-500

reed         0,045-55  0,039-45         225             ? (maybe same as SB)
             (depending on the amount of wire to hold it together)

flax-mat     0,045     0,038            150             ? (prob. 30-50)

cork-plates  0,045     0,038            80              ? low, but long
(heat-expanded cork)                                    transport-ways

cocos-mats   0,045-51  0,038-42         50-125           95

sheep-wool   0,045     0,038            100              5-50 depends on
(Daemwool, washed and impregnated with Mitin)            transport to wash

Conclusion: energy-amortization-times of insulation-materials:

strawbale, reed, cellulose: 0-1 month
cork, sheep-wool: -2 month (depending on transport-distances to
manufacture/wash the material)
cocos-plates: 2-3 month
fibreglass (mineral- or stonewool): 8 month
polystyrol (EPS/XPS): 13- month
polyurethan (PU): 17-18 month (this is the ugly thing people spray between
window- and doorspaces)

2) insulation-price per squaremeter and for 150m2 low-energy house (150m2
living space means ca. 400 m2 wall and roof), all prices in EURO
The following values are necessary to guarantee a wall with U = 0,15 W/m2K
(standard for well-insulated low-energy-houses in Europe)

material    LRTr10    thickness of wall    price/m2   for 150m2

strawbales   0,045          30 cm           3,6        1.453,-

cellulose    0,045          30 cm          18,3        7.326,-

EPS-W15      0,038          24 cm          20,3        8.139,-

fibreglass   0,038          24 cm          23,5        9.419,-

reed         0,045          30 cm          25,6       10.232,-

flax-mat     0,045          30 cm          51,-       20.406,-

cork-plates  0,045          30 cm          87,2       34.883,-

cocos-mats   0,045          30 cm         144,6,-     57.849,-

sheep-wool   0,045          30 cm         163,5       65.406,-

prices for materials are from Austria and can differ with country.

You can combine 1) and 2), the conclusion will always be: strawbale and
cellulose are the ideal insulation-materials (even when you dont use more
parameters than price only). We have only problems in revitalisation of old
buildings, where you cant use these materials.

best wishes
Herbert Gruber
- -------------------------------
asbn austrian strawbale network
herbert & astrid gruber
email: asbn@...
- -------------------------------

>  Von: "Martin Oehlmann" martin.oehlmann@...
>  Antworten an: "GSBN" GSBN@...
>  Datum: Sun, 3 Nov 2002 19:34:51 +0100
>  An: "GSBN" GSBN@...
>  Betreff: GSBN:
>  Hi,
>  We would like to compare production energy and insulation values of regular
>  walls (for example: brick + rockwool + cementelements, etc.) with sb-wall
>  systems. So far as simple bale-builders we did gently overlook these
>  aspects, but are challenged to respond.
>  Any idea where to find a list of specified common building materials
>  including consumed production energy and insultion values???
>  Thanks a lot,
>  Martin Oehlmann
>  Den Haag
>  0031-70-3650410
- -- 
Bill Christensen

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Date: 4 Nov 2002 17:05:49 -0600
From: "Martin Oehlmann" martin.oehlmann@...
Subject: RE: GSBN:

Thanks John and all the very best with this magical gathering. Splendid time
and greetings to all of you,

- -----Oorspronkelijk bericht-----
Van: GSBN [mailto:GSBN@...]Namens Huff 'n' Puff
Verzonden: maandag 4 november 2002 0:03
CC: harry@partridge.com.au; B.Lawson@unsw.edu.au; martin.oehlmann@...
Onderwerp: Re: GSBN:

G' day Martin

Good question and I suggest that you write to Harry Partridge on:


Harry is a well known Sydney Structural Engineer and wrote in combinbation
with Dr. Bill Lawson of the University of NSW a book on the Building
Material Ecological  Sustainabilty Index or BES Index.

They did some great work on the sustainability index of common building
materials and systems.  Harry is presenting a paper at the ISBBC 2002.

I hope this is of some help in getting you on the right track.  BTW Harry
built Sydney's and one of Australia's first straw bale buildings at
Killara.  It was a second storey extension in rice straw, not easy to do.

Kind regards John.

ISBBC 2002: http://www.csu.edu.au/special/strawbale

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