[Strawbale] OSB or Not? (rendering versus sheeting) (dirk witvrouwen)

[Kitta Potgieter]

Jure,

Did the owners maintain the lime plaster with regular lime washes?  Are the
bales actually rotten - all of them?  Did it happen gradually or all of a
sudden after a really bad winter (like last year in Scotland) with wet
weather followed by freezing weather?

Kitta

On 6 December 2010 05:10, Sport Hotel, Jure Pozar <jure.pozar at gmail...>wrote:

> Dear All,
>
> I have in interesting information. I have spoken to a guy who does
> natural plastering for over 20 years and he said that the houses in
> Austria which he worked on 20 years ago show problems now. The plaster
> which was applied directly to the strawbales on the outside is cracking
> and falling off and they found out because over the years some moisture
> got inside the straw and made it crumble and dissolve. So the house is
> no good now and there is no easy way to repair it. I wouldn`t like my
> house to live the same misfortune in cca 20 years time. This is why
> vapour barrier and wind proof facade is a good solution. I can`t wait to
> hear your comments.
>
> Cheers
>
> Jure
>
> S, Max Vittrup Jensen piše:
> > Hi Dirk,
> >
> > If you'll join the ESBG 2011, you'll see my approach, which I believe is
> > fairly generic:
> > Earth plaster straight on vertical bales, sloped ceiling made from beams
> > with rough wooden boards with about 10 cm spacing to hold the bales
> > above; the boards covered with reeds below and plastered. (The bales are
> > also plastered on top, and ventilated below a vapor barrier, which again
> > is covered with roof tiles, after another ventilation space.
> > I don't usually consider myself 'conservative', but in this respect I
> > suppose I am; it's a fairly old proven approach. I'm still waiting to
> > hear from people who'd gone in and inspected OSB boards after 5-10 years
> > use above a kitchen (used by a family with children in a country with
> > plenty of wet and cold days outside). I'd like to see what's hidden
> > behind the nice plaster below and covered with straw etc. above.
> > Perhaps it's my simple pragmatic mind, however I can't grasp why the OSB
> > don't turn black with fungi...
> >
> > I'm aware of a CZ-Austrian funded project which made such insulations
> > about 5 years ago, but apart from the architects showing they could do
> > it (and profiling themselves at conferences and media), then there's
> > never been a follow up research about the long term effect...
> >
> > As we also reside in a forested part of Eastern Europe, where rough cut
> > wooden boards from local forests/mills are still significantly cheaper
> > (despite the export to Austria!!!), then it makes a lot more economical
> > sense than OSB.
> > There's been enough well articulated points about several other
> > downfalls to OSB, especially from Derryl and Rob Tom, so I'll simply
> > summarize it with Rob's statement: "OSB Stinks!"
> > [Which might be why, at the ESBG, you're only likely to find OSB used
> > for the composting toilets ;o)  (We were given some which had been water
> > damaged in a flood)]
> >
> > Cheers,
> > Max
> >
> > All,
> >
> > I read people objecting agains using sheet material instead of rendering
> the bales directly. The reasoning seems to be mainly relating fire
> protection and sealing air leaks. Yet, lot's of people use bales in their
> roofs. I'm assuming none of them would render the underside of these bales.
> So why do it for wall's if it's not done for the roof?  Any thoughts?
> >
> > Thanks,
> > Dirk
> >
> >
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> >
> >
>
>
> --
>
>
>
> Jure Požar, dipl.org.tur./ general manager
>
> HOTEL SPORT&   MTB park Notranjska
> Kolodvorska c. 1, Postojna
> Slovenia
> Tel.: +386 5 720 22 44
> Fax:  +386 5 720 22 40
> Mobile: + 386 51 630 575
> www.sport-hotel.si
> e-mail: jure at sport-hotel...
> www.dos-extreme.si
> skype: jure.pozar
>
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>
>
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