[Strawbale] OSB or Not? (rendering versus sheeting) (dirk witvrouwen)
Sport Hotel, Jure Pozar
jure.pozar at gmail...
Mon Dec 6 11:43:45 CET 2010
Dear Kitta,
I am not sure if they have maintained the plaster with the regular lime
washes, as I haven`t asked, but this happened to a few houses this old
and I would say at least one of them must have had an orderly
housekeeper to maintain the plaster properly. As far as I understood the
problem of the plater was not the cracking itself, but rotten straw
underneath to which the plaster is attached which caused the plaster to
shear in whole layers. I reckon lime plaster needs to be maintained with
lime wash every few years (perhaps every year?) otherwise you have
problems with cracking in the future. But I was addressing different
problem here: straw rotting underneath the otherwise healthy lime plaster.
Regards,
Jure
S, Kitta Potgieter pis(e:
> 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... <mailto: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 pis(e:
> > 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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> >
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> >
> >
> >
>
>
> --
>
>
>
> Jure Poz(ar, 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 <http://www.sport-hotel.si>
> e-mail: jure at sport-hotel... <mailto:jure at sport-hotel...>
> www.dos-extreme.si <http://www.dos-extreme.si>
> skype: jure.pozar
>
> Bodi resnicoljuben: nikoli se ne pretvarjaj. Resnica vedno zmaga
> Be truthful: never pretend. The truth always wins
>
>
> ____________________________________________________
> European strawbale building discussion list
>
> Send all messages to:
> Strawbale at amper....muni.cz <mailto:Strawbale at amper....muni.cz>
>
> Archives, subscription options, etc:
> http://amper.ped.muni.cz/mailman/listinfo/strawbale
> ____________________________________________________
>
>
>
>
> ____________________________________________________
> European strawbale building discussion list
>
> Send all messages to:
> Strawbale at amper....muni.cz
>
> Archives, subscription options, etc:
> http://amper.ped.muni.cz/mailman/listinfo/strawbale
> ____________________________________________________
>
>
--
Jure Poz(ar, 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
Bodi resnicoljuben: nikoli se ne pretvarjaj. Resnica vedno zmaga
Be truthful: never pretend. The truth always wins
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