[Strawbale] Plaster content

[Andrew Morrison]

I strongly recommend a 2:1 ratio, not 1:1. A 1:1 mix is very rich and not
necessary in most cases. At all costs, avoid using cement as it interrupts
the cure of the lime and actually makes the plaster more brittle and likely
to crack. It also reduces the vapor permeance of the plaster.

A standard straw bale wall lime plaster should be a 2:1 scratch coat, 2.5:1
brown coat, and a 3:1 finish coat. You can choose to add some chopped straw,
horse hair, or other binder as well, but it is not necessary.

Andrew

2011/8/11 Enn Veesalu <enn.veesalu at hariduskeskus...>

> ** ** ** **
>
> I am agree, that somebody would be disagree. In this case possible to use
> original recipe (1 *:* 1) and it's OK!****
>
> ** **
>
> **Enn Veesalu******
>
>  ****
>
> ** **
>  ------------------------------
>
> *From:* strawbale-bounces at amper....muni.cz [mailto:
> strawbale-bounces at amper....muni.cz] *On Behalf Of *Sport Hotel, Jure
> Pozar
> *Sent:* Thursday, August 11, 2011 9:21 AM
> *To:* European strawbale building discussions
> *Subject:* Re: [Strawbale] Plaster content****
>
> ** **
>
> Thats what I heard that people do this days: add little cement for
> strenghtening, but lots of people would probably disagree with this.
>
> Jure
>
> Dne 11.8.2011 6:00, piše **Enn Veesalu**: ****
>
> **Hello Tomas!********
>
> ** ******
>
> Maybe too late for you, but you asked about recipe for lime plaster
> outside. ********
>
> I am not sure for strawbale walls, but for stone walls (I hope it's the
> same) restorers use ratio 1 : 1, what mean that 50% sand and 50% lime. ***
> *****
>
> Now days surrounding air have a lot pollutants and pure lime plaster is not
> so strong enough for active components in outside. In this case is
> permissible today to add very small amount cement too; for strengthening
> plaster.********
>
> ** ******
>
> Regards,********
>
> ****Enn Veesalu********
> ****
>
>    ********
>
> ** ******
>  ------------------------------
>
> *From:* strawbale-bounces at amper....muni.cz [
> mailto:strawbale-bounces at amper....muni.cz<strawbale-bounces at amper....muni.cz>]
> *On Behalf Of *Thomas Simkevicius
> *Sent:* Wednesday, July 20, 2011 12:01 AM
> *To:* strawbale at amper....muni.cz
> *Subject:* [Strawbale] Plaster content****
>  ****
>
> ** ******
>
> Hello,********
>
>  ********
>
> Last week put some scratch coat onto my strawbale garage. The render mix
> that I have used for the inside was 4 parts coarse sand to 1 part pure
> clay to 0,5 part chopped straw. With this mix everything went perfect,  no
> cracks appeared when the plaster dried.********
>
>  For the outside scratch coat I used the same ratio plus added hydrated
> lime in powder to the mix. The ratio of the lime I tried to keep to around
> 5% of the mix. The outside plaster cracked a lot. I'm sure that the reason
> for the cracks was lime. There was little area outside where I did not put
> lime in the plaster, and in this area no cracks appeared when the plaster
> dried. What ratio of lime should I keep in the mix for the outside?*******
> *
>
>  ********
>
> Regards,********
>
>  ********
>
> Tomas********
>
>  ********
>
>
>
>
> ****
>
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> ****
>
> -- ****
>
> ** **
>
> ** **
>
> ** **
>
> Jure Požar, dipl.org.tur./ general manager****
>
> ** **
>
> HOTEL SPORT &  MTB park Notranjska****
>
> Kolodvorska c. 1, Postojna****
>
> ****Slovenia**** ****
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> ** **
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-- 
Andrew Morrison
Consultant, Teacher, Inspiring Change

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