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Hello,<br>
<br>
Thanks Desert David for correcting what I understood of our
conversation. <br>
<br>
I see no point in trying to reduce the convection in the correctly
built and plasterd SB walls (where all the holes are correctly
stuffed). Ok, there is some convection in fibrous insulation
material; probably because they contain larger air spaces than
'normal' insulation materials . But we still have VERY well
preforming walls so let's put our attention on other details that
make a well preforming building. Also, including 'solutions' for
imaginary problems often create new real problems.<br>
<br>
As for the performance of SB combined with panels; rather drawing a
final conclusion from 1 test (even if it were done by the best
experts) or a gut feeling I feel that it is a field where I would
first like to see a lot more hard data. Adapting Bruce's book
'Design of SB Buildings' to french made me realize that thermal
testing is a very complex thing. That mistakes (in the protocol, in
comparing and in drawing conlusions) are easily made and the numbers
that come out give us, at best, a very limited vision of thermal
reality. Still, they are clues to a better understanding. And then
there is the real world... Herbert, are there any pasif house
buildings made with OSB and SB that live up to those expectations?<br>
<br>
Thanks Carol for Jan Lacompte's paper
(<a class="moz-txt-link-freetext" href="http://www.viking-house.ie/downloads/Lecompte%20paper_partial%20fill%20cavity%20walling.pdf">http://www.viking-house.ie/downloads/Lecompte%20paper_partial%20fill%20cavity%20walling.pdf</a>)<br>
<br>
I wish you all a nice day,<br>
<br>
André - drowning in Cognac - de Bouter<br>
France<br>
<br>
<br>
<br>
<br>
<br>
Le 08/12/2010 23:59, Jan Hollan a écrit :
<blockquote
cite="mid:Pine.LNX.4.64.1012082346420.2032@amper....muni.cz"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">I've wondered what can be done about this. Convection needs height to
really get going so I wonder if some less permeable layer laid
horizontally between the layers of bales might reduce it some.
</pre>
</blockquote>
<pre wrap="">
My guess is it makes it worse, in the wall. It is not a pleasant thought
for me, as I have insulated this way (using cardboard or paper) one wall
already. It is better to let the air flow along the wall, as it makes no
harm. The more convection cells spanning the full width of the insulation
layer, the worse.
The airflow/convection barrier should be perpendicular to the heat flux,
like panes in the window. This is easy in roofspace insulation (two
layers of small bales or many sheets of straw from jumbo bales). I'm doing
it on walls as well, using one decimetre thick sheets from large bales put
into a light wooden framework.
Some maths concerning that is deep within the list archive... March and
April 2005. Something more on that is in Czech only,
<a class="moz-txt-link-freetext" href="http://amper.ped.muni.cz/pasiv/slama/how_work.pdf">http://amper.ped.muni.cz/pasiv/slama/how_work.pdf</a>
yours moderator and list almost-no-reader
Jenik
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