[Cob] Plaster failure question

[Amanda Peck]

I'm curious about THE answer, having the same kind of problem with lime 
chinking in a wooden wall.

In my case, I should probably put all kinds of little screws in the wood--as 
opposed to scratching it.

Did you wet the wall down well?  Dry cob might cause the lime plaster to dry 
too fast on the inside.
.......

Georgie wrote (snipped)

Over the winter and spring, it became obvious that significant portions of 
the plaster had pulled away from the wall and was primed to fall off, or be 
knocked off by passersby. I can go around the wall and, by knocking, tell by 
the hollow sound that some plaster didn't adhere/pulled away.