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<TITLE>Re: [GSBN] Decrement factor of SB walls (Valentina Maini)</TITLE>
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<FONT FACE="Arial"><SPAN STYLE='font-size:11pt'>Dear Valentina,<BR>
<BR>
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. <BR>
<BR>
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)?<BR>
<BR>
Thanks.<BR>
<BR>
Martin<BR>
<BR>
<BR>
On 11/28/11 11:03 PM, "valentina maini" <<a href="vmaini@mac.com">vmaini@mac.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Arial"><SPAN STYLE='font-size:11pt'>Hi Martin,<BR>
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.<BR>
Delay of 14,1 hours reduction of wave peak 98%...very good results indeed especially for summer climate...<BR>
Tha calculation uses official data for energetic certification in italy.... i applied that for spain...<BR>
warm wishes, valentina<BR>
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<IMG src="cid:3405435083_44687877" ><BR>
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</SPAN><FONT COLOR="#FF8E00"><FONT SIZE="1"><SPAN STYLE='font-size:9pt'> www.valentinamaini.net <<a href="http://www.valentinamaini.net">http://www.valentinamaini.net</a>> <BR>
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El 29/11/2011, a las 03:43, martin hammer escribió:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Arial"><SPAN STYLE='font-size:11pt'>Re: [GSBN] Decrement factor of SB walls <BR>
Thanks very much Jorge, David, Laura, and Bohdan,<BR>
<BR>
Very helpful. I will study it all further.<BR>
<BR>
Decrementally yours,<BR>
<BR>
Martin<BR>
<BR>
<BR>
On 11/28/11 2:55 PM, "David Eisenberg" <<a href="strawnet@aol.com">strawnet@aol.com</a> <x-msg:<a href="//179/strawnet@aol.com">//179/strawnet@aol.com</a>> > wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Arial"><SPAN STYLE='font-size:11pt'>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. <BR>
<BR>
David Eisenberg<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: Laura Bartels <<a href="laura@greenweaverinc.com">laura@greenweaverinc.com</a> <x-msg:<a href="//179/laura@greenweaverinc.com">//179/laura@greenweaverinc.com</a>> ><BR>
To: Global Straw Building Network <<a href="GSBN@sustainablesources.com">GSBN@sustainablesources.com</a> <x-msg:<a href="//179/GSBN@sustainablesources.com">//179/GSBN@sustainablesources.com</a>> ><BR>
Sent: Mon, Nov 28, 2011 3:40 pm<BR>
Subject: Re: [GSBN] Decrement factor of SB walls<BR>
<BR>
Hi Martin, <BR>
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?<BR>
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Laura<BR>
<BR>
<BR>
John,<BR>
<BR>
There is that chapter from Ken Haggard and Polly Cooper on Natural<BR>
Conditioning in the book Alternative Construction where they look at<BR>
this. I was looking at it just recently for some curriculum development.<BR>
<BR>
Laura<BR>
<BR>
John Swearingen wrote:<BR>
<BR>
</SPAN></FONT></FONT><BLOCKQUOTE><FONT FACE="Arial"><FONT SIZE="2"><SPAN STYLE='font-size:10pt'>Very interesting paper, and well written. Some time ago I remember hearing<BR>
someone toss out some similar observations about thermal storage, that on a<BR>
diurnal cycle, plaster is activated to a depth of about 2-3 inches<BR>
(5cm -7.5cm). I have always figured that the exceptional thermal<BR>
performance of<BR>
straw bale buildings is not due solely to the high R-value. The broad<BR>
thermal mass of the plastered walls, readily available to indoor air for<BR>
heat exchange, modulates temperatures like my pink Cadillac modulates bumps<BR>
in the road.<BR>
<BR>
Does anyone know of research and measurements of short and medium thermal<BR>
storage in walls?<BR>
<BR>
John "Diurnally Yours" Swearingen<BR>
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</I></B></SPAN></FONT></FONT><B><I><FONT COLOR="#4C721D"><FONT FACE="Times New Roman"><SPAN STYLE='font-size:12pt'>Laura Bartels<BR>
GreenWeaver Inc.<BR>
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