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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, From: strawbale-bounces@amper....muni.cz
[mailto:strawbale-bounces@amper....muni.cz] On
Behalf Of Thomas Simkevicius 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 |