Re: [Strawbale] Plaster content

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

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@amper....muni.cz [mailto:strawbale-bounces@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@amper.ped.muni.cz [mailto:strawbale-bounces@amper....muni.cz] On Behalf Of Thomas Simkevicius
Sent: Wednesday, July 20, 2011 12:01 AM
To: strawbale@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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