[Strawbale] comparing insulation materials
Martin Oehlmann
martin.oehlmann at wxs...
Mon Nov 4 19:38:06 CET 2002
comparing insulation materialsThank you Herbert, excellent material, any
detailed source for conventional systems? Thanks to Rene also. I persume
gradually we will be able to compare different systems. Anyone with more of
such treasures?
Best wishes, Martin
-----Oorspronkelijk bericht-----
Van: strawbale-admin at amper....muni.cz
[mailto:strawbale-admin at amper....muni.cz]Namens Herbert Gruber
Verzonden: maandag 4 november 2002 14:47
Aan: strawbale at amper....muni.cz
Onderwerp: [Strawbale] comparing insulation materials
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 König (a well known Baubiologist in Germany)
describes in his books (e.g. "Das Dachgeschoß", Ökobuch-Verlag)
* added by the calculations concerning production energy with the help of
Gerd Zwieners book "Ökologisches Baustoff-Lexikon" (C.F.Müller).
(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°K
(=1°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°C (for 1m, so L never depends on thickness
of wall)
k-value (new after CEN: U-value): k= W/m2K (Wärmedurchgangskoeffizient,
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)
(Heraflax)
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
http://www.baubiologie.at
email: asbn at aon...
-------------------------------
> Von: "Martin Oehlmann" <martin.oehlmann at wxs...>
> Antworten an: "GSBN" <GSBN at lists....com>
> Datum: Sun, 3 Nov 2002 19:34:51 +0100
> An: "GSBN" <GSBN at lists....com>
> 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
>
>
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