[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
              (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 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
  > walls (for example: brick + rockwool + cementelements, etc.) with
  > 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
  > ----
  > For instructions on joining, leaving, or otherwise using the GSBN list,
  > email to GSBN at lists....com with HELP in the SUBJECT line.
  > ----
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