[GSBN] Bale density

[asbn]

I our old tests in Austria by Technical University of Vienna/GrAT the  
minimum weight for ideal thermal performance is 85kg/m3
Since 2008 we have a new buildings-strawbale, which was tested  
ETA-10/0032 with a minimum weight of 95kg/m3
Germany starts with a minimum weight of 90kg/m3

here are the links to our tests in Austria:
Wärmedämmleitwert-Überprüfung (first test 2002)
http://www.waldland.at/de/waldviertler_flachshaus/strohdaemmung/produktspezifikation/

tests in Germany by FASBA:
http://www.baubiologie.at/download/Pb-lambda1.pdf

I all the tests we used wheat-straw

We use the certified (building)bales for non-loadbearing walls as well  
as for (a few) loadbearing walls

regards
Herbert Gruber
-----------------
asbn - austrian strawbale network
3720 Ravelsbach, Baierdorf 6
Tel. 02958-83640
asbn at baubiologie.at
www.baubiologie.at



Am 17.02.2013 um 18:00 schrieb martin hammer:

> Hello all,
>
> Anyone care to weigh in (pun intended) on the minimum bale density  
> for straw bale walls?
>
> This is in the context of the most recent straw bale code proposal  
> for the International Residential Code.
>
> Things to consider:
>
> I’m interested in the minimum acceptable density, not the optimum
> Densities from tested assemblies are especially useful (especially  
> structural tests) (please mention the test if this is the case)
> Include type of straw with your number(s) if relevant
> Dry densities are preferred (bale weight / bale volume, minus %  
> moisture content), but wet densities are ok if you also give the  
> approximate moisture content.
> Lb/sq.ft. or kg/m3 are ok.
> Whether the minimum acceptable density should be different for  
> structural (load-bearing or shear wall) and nonload-bearing  
> applications
>
> (Note: I’m aware that cutting the bale ties before plastering is a  
> practice some employ, at least for nonload-bearing walls.)
>
> Thanks!
>
> Martin Hammer
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> GSBN at sustainablesources.com
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