[Strawbale] Volunteers for 3-layer passive insulation?

Mark Bigland-Pritchard mark at lowenergydesign...
Thu Jul 20 18:17:11 CEST 2006

Potentially really exciting, Jenik.  Wish I could be there.
What sort of monitoring will you be doing?  For example, do you have any 
plans for comparative monitoring to see how much you can cut the heat 
loss this way compared to single bales of the same overall thickness?
Borden, Saskatchewan, Canada

Jan Hollan wrote:

>If anybody would be interested to help us much sooner, Tuesday to Thursday
>(next week, July 25-27) in Hostetin, we would welcome it.
>We will insulate one wall of the building (author: Georg W Reinberg) being
>currently constructed there. At least 3-ply straw sandwich (40 cm thick)
>will be used.  Well separable layers taken from jumbo bales will be
>employed, about 7 cm thick (taken as pairs in this case). At wall, they
>will be separated by paper, at least each 14 cm of thickness. The purpose
>of dividing straw by paper is to suppress heat transport by convection to
>almost negligible values (convection takes place just inside the
>individual chambers of 1/3 thickness, at 1/3 temperature drop and less
>then 1/3 flow speed, so the total convection heat transport is about 1/10
>of the case with just a single undivided straw layer). Such suppression is
>a prerequisite to achieve passive-house U values of about 0.1 W/m2K.
>The roof of the backyard building is insulated by straw already, divided
>just to halves by paper (this is sufficient for horizontal insulations).
>I think this is the first attempt to reach ``passive values'' reliably
>with straw instead of commercial insulation materials. Don't you want to
>play a role in it?
>Hostetin is in eastern Czechia, close to Slovak border. It's a small
>village with 280 inhabitants. A plethora of interesting environmental
>projects took place there already, becoming well known in our country. An
>interesting site to visit in any case.
>We can offer you food and simple (basically outdoor, under shelter)
>nightings. Stars are nicely visible in Hostetin, thanks to brand new
>outdoor lighting retrofit using fully shielded lights (donated by
>Phillips). We have a small pub there and a rather cold (but nice in hot
>weather) pond on a stream just above the village.
>The building site is quite busy (Skanska is the contractor), but I on
>``our'' wall in the orchard we will be able to work without much
>intervention by another professions.
>If you would be inclined to come Monday evening and help us, please write
>me off-list. I will send you further info.
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>Strawbale at amper....muni.cz
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