How to plaster on Wood Wool? Plaster mesh? How to attach it?

[Fred vom Jupiter]

When I tear away the urine-yellow tiles from the outer bathroom wall, I discover that it consists of Träullit, wood shavings covered in cement. The old plaster came off with the tiles when they were torn down.

A bricklayer who was home for other work commented and said that I need to put a plaster mesh so that the plaster will hold. Could that be true? I thought Träullit was a good plaster carrier. The next question is, of course, how to attach a plaster mesh to the porous substrate. You can crumble it with your fingers. Screws, plugs, anchor compounds, or anything else will not adhere.

Additionally, I wonder if I need to sand away the old bathroom paint where the walls have not been tiled? It would be nice to avoid that, but the question is whether the new waterproof layer adheres well enough.

Does anyone know?

 

[larsbj]

You attach the reinforcement mesh by embedding it in a thin base coat of plaster.

watch around 3.48 into the video

https://www.youtube.com/watch?v=pZw5Sn4Kmkk

 

[Isakare]

It shouldn't be necessary, I haven't found any net in my basement walls where I've repaired damages, and that render has been holding up nicely since 1958 on träullit.

 

[larsbj]

The plaster mesh is not for it to attach. It is to prevent cracking. For example, in Ts case where there should be a waterproof layer on.