[GSBN] Decrement factor of SB walls (Valentina Maini)

Wed Nov 30 07:46:28 UTC 2011

Dear Martin, and all

Thank you very much for your interest !! you and  this list are my heroes! .
It's true and kind of impolite... i never did a presentation of myself. I have to say is due to a little shyness ...

So first the question: 
The bale on Valencia house is simply sitting, with some pins to fix position, on wood X-lam structural floor. The floor is elevated about 30 cm from soil and this bale is connected with strings  to the wall of  X-Lam wood panel behind..So the entire house enclosure (floor-walls-roof) is made with X-Lam wood panels. Exterior walls are insulated with straw (on the outside-lke wrapping) Floor is insulated form inside with cork and roofs are insulated from outside with wood fiber panels. This house is a "poor" copy of the S-HOUSE - project of Austria. So there are no SIP. the X-Lam is now produce in Spain but we used the same austrian product (not very local but very useful :-,)- The house near Barcelona is the one the data i've sent referred to.

And a little presentation of myself: 
I'm 43 italian architect in barcelona, spain, since 16 years. I love being just "between"  and living the contradictions of that,  hoping always to stay "outside the box" and be a bridge (over troubled water:-)) for myself and others....i'm far from reaching that! :-D.
I've met strawbale in 2000..recently graduated, when we organized a 7 month workshop on natural building with the cooperativa of architects  we created back then. ..here a very old/naif web:  curso.  In 2001, edting a book about natural materials,  i've met Maren Termens that show me the European and Global Network. 
Since then i'm working on projects and divulgation of natural materials and especially straw. And worked with Maren and Rikki for the the Spanish Straw network casasdepaja.org | soplad, soplad!as much as i could. I finally was able to attend ESBG of 2007 and 2009. 
From ESBG i was involved in a group that ended in a EU- Leonardo Project  Leonardo - European Learning Partnership for Strawbale Building ...that now just started the  second edition. I'm actually working @ home with projects. a@ Universities of architecture in Barcelona as teacher of construction, @ web for spanish and EU strawnetwork , and @BAM 012 | Bioarquitectura Mediterránea organizing an event on bio-architecture in mediterranean area. My web www.valentinamaini.net is still on process.

I hope to meet you all soon in real space! Thank you Thank you Thank you for being there! Ciao, Valentina

El 30/11/2011, a las 03:11, martin hammer escribió:

> Dear Valentina,
> 
> Thanks very much for the detailed information on thermal performance of one of your SB buildings in summer.  The thermal delay is consistent with what others have reported.  
> 
> As much as I know some GSBN members and their work, others I don’t know at all.  I visited your website (www.valentinamaini.net) and enjoyed seeing your “Strawbale house near Valencia” and “Strawbale house near Barcelona”.  I invite others to do the same.  One question I have is what the detail is at the base of the bale wall for the Valencia house.  Are the bales simply sitting directly on the wood platform?  Also, are the roof and floor made of SIPs (structural insulated panels)?
> 
> Thanks.
> 
> Martin
> 
> 
> On 11/28/11 11:03 PM, "valentina maini" <vmaini at mac.com> wrote:
> 
>> Hi Martin,
>> I have this data of static calculation of summer performance we made with a not dynamic software... that says that hours of delay of heat weave and reduction of the heat weave in a straw wall with 4,5 cm clay inside and 3,5 lime outside..and 35 straw on hedge.
>> Delay of 14,1 hours reduction of wave peak 98%...very good results indeed especially for summer climate...
>> Tha calculation uses official data for energetic certification in italy.... i applied that for spain...
>> warm wishes, valentina
>> 
>> <image.jpg>
>> 
>> 
>> 
>> www.valentinamaini.net <http://www.valentinamaini.net> 
>> 
>> 
>> 
>> El 29/11/2011, a las 03:43, martin hammer escribió:
>> 
>>> Re: [GSBN] Decrement factor of SB walls 
>>> Thanks very much Jorge, David, Laura, and Bohdan,
>>> 
>>> Very helpful.  I will study it all further.
>>> 
>>> Decrementally yours,
>>> 
>>> Martin
>>> 
>>> 
>>> On 11/28/11 2:55 PM, "David Eisenberg" <strawnet at aol.com <x-msg://179/strawnet@aol.com> > wrote:
>>> 
>>>> Ken, Polly Cooper and Jennifer Rennick's chapter that John mention's in that Wiley book - Alternative Construction: Contemporary Natural Building Methods, has a lot of information on this though they don't use the term "decrement." They talk about this issue with straw and other types of wall systems and go into considerable detail. I would get in touch with them and see what they have to say. 
>>>> 
>>>> David Eisenberg
>>>>  
>>>>  
>>>> -----Original Message-----
>>>> From: Laura Bartels <laura at greenweaverinc.com <x-msg://179/laura@greenweaverinc.com> >
>>>> To: Global Straw Building Network <GSBN at sustainablesources.com <x-msg://179/GSBN@sustainablesources.com> >
>>>> Sent: Mon, Nov 28, 2011 3:40 pm
>>>> Subject: Re: [GSBN] Decrement factor of SB walls
>>>> 
>>>> Hi Martin, 
>>>> Without going back to the details, I could be mistaken, but it seems that a study by Ken Haggard a while back addressed this or similar properties. I found reference in a GSBN email from '07- see below. Is this the same metric?
>>>> 
>>>> Laura
>>>> 
>>>> 
>>>> John,
>>>> 
>>>> There is that chapter from Ken Haggard and Polly Cooper on Natural
>>>> Conditioning in the book Alternative Construction where they look at
>>>> this. I was looking at it just recently for some curriculum development.
>>>> 
>>>> Laura
>>>> 
>>>> John Swearingen wrote:
>>>> 
>>>>> Very interesting paper, and well written.  Some time ago I remember hearing
>>>>> someone toss out some similar observations about thermal storage, that on a
>>>>> diurnal cycle, plaster is activated to a depth of about 2-3 inches
>>>>> (5cm -7.5cm).  I have always figured that the exceptional thermal
>>>>> performance of
>>>>> straw bale buildings is not due solely to the high R-value.  The broad
>>>>> thermal mass of the plastered walls, readily available to indoor air for
>>>>> heat exchange, modulates temperatures like my pink Cadillac modulates bumps
>>>>> in the road.
>>>>> 
>>>>> Does anyone know of research and measurements of short and medium thermal
>>>>> storage in walls?
>>>>> 
>>>>> John "Diurnally Yours" Swearingen
>>>> 
>>>> 
>>>> 
>>>> Laura Bartels
>>>> GreenWeaver Inc.
>>>> 520 S. Third St., Suite 5 
>>>> Carbondale, CO 81623
>>>> 970-379-6779
>>>> www.greenweaverinc.com <http://www.greenweaverinc.com>  <http://www.greenweaverinc.com <http://www.greenweaverinc.com/> > 
>>>> 
>>>> 
>>>> <image.jpg>
>>>> 
>>>> 
>>>> We've moved to the Third St. Center 
>>>> http://thirdstreetcenter.net/ <http:// <http:/> thirdstreetcenter.net/ <http://thirdstreetcenter.net/> > 
>>>> A community place promoting inspiration, sustainability and creative exchange
>>>>> 
>>>>> 
>>>>> _______________________________________________
>> 
> _______________________________________________
> GSBN mailing list
> GSBN at sustainablesources.com
> http://sustainablesources.com/mailman/listinfo.cgi/GSBN

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sustainablesources.com/pipermail/gsbn/attachments/20111130/1f4c0216/attachment.htm>