[GSBN] Bale density

[asbn]

Dear Martin

Weights are for actual density and are tested normally on the field  
(so normally include 12-15% humidity),
in ETA (European Technical Approval) it is additionally defined that a  
strawbale has to fulfill the following quality-criterias:
maximum humidity: < 15 % of weight
additionally weed: < 0,5 %
rest corn: < 0,4 %

Bulk density according to European Norm EN 1602 lies between 95 kg/m3  
and 120 kg/m3 (-10%, +15% of theoretical density)

kind 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 20:30 schrieb martin hammer:

> Thanks very much Herbert.  Are your numbers dry density (with the  
> weight of moisture subtracted) or actual density (as weighed)?
>
>
> On 2/17/13 9:55 AM, "asbn" <asbn at baubiologie.at> wrote:
>
>> 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 <http://www.baubiologie.at/download/zertifikate/lambda.html 
>> >  (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 <http://www.baubiologie.at>
>>
>>
>>
>>
>> Am 17.02.2013 um 18:00 schrieb martin hammer:
>>
>>>  Bale density
>>>  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
>>>
>>>   _______________________________________________
>>> GSBN mailing list
>>> GSBN at sustainablesources.com
>>> http://sustainablesources.com/mailman/listinfo.cgi/GSBN
>>
>>
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