Why is the plaster coming off?

[Vasseman]

On my veranda, which was built with Leca blocks, the craftsmen plastered with Weber Putsbruk C. It's about 15 years old. It is well-drained, so moisture isn't coming from below.

Now it has come off and looks terrible. There are hollow spots in several places.

Why?

What is the best thing to do now?

Grateful for tips.

 

[Plupp 405730]

It comes off because it's wrongly plastered from the beginning, plaster mix C is too poor against the ground..
On Leca, you should prime with base plaster A and then use plaster mix B as the lowest quality against the ground..

Then I would recommend netting the plaster to increase the strength, but it's not a requirement for the Leca stone…

 

[Vasseman]

It releases because it was wrongly plastered from the start, plaster C is too weak against the ground..
On Leca, you should prime with primer A and then plaster B as the lowest quality against the ground..

Then I would recommend netting the plaster to increase strength, but it is not a requirement on the Leca blocks...

Thanks for the answer!!!

 

[seniorkonsult]

On my veranda which was built with Leca-stone, the craftsmen plastered with Weber Putsbruk C.
It is about 15 years old. It is well-drained so moisture does not come from below.

Now it has come loose and looks terrible. Hollow in several places.

Why?

What is the best thing I can do now?

Grateful for tips.

I have a similar problem.