[Cob] Different plasters

[RB]

Hello everyone,
I have an idea to use different plasters on the same wall. Lime plaster on
the lower part of the wall where for shure it will receive rain. And clay
plaster on the upper part of the wall (protected by roof). Clay plaster
seems more friendly for my hands and is better for breathing wall. But I
have some doubts about possible cracking between two different plasters
(different expanding rate?) and about wetness travelling up the lime plaster
and destroing clay plaster (we have a lot of "rain during the day- cold at
night").
The wall is more light clay then cob. The wall and the house under
development can be seen at:
www.blogas.lt/RB