Plaster on Wood Wool

[RolloKola]

I am renovating a room in the basement of my house from 1946. One of the walls is covered with Träullit. See picture
I plan to apply new plaster as the old one is loose and falling off.

What plaster do you recommend? Would gypsum plaster like Weber's Gypsum work, or should I use a cement-based plaster like Weber base 224 plaster mix C?

I'm also considering applying a steel mesh as reinforcement against the Träullit before applying the plaster to make it hold better and possibly to help the plaster adhere better. There is mesh in place now, and I think it’s between the joints of the Träullit boards. I plan to put mesh over the entire surface.

Does reinforcement mesh provide any advantage for helping the plaster adhere better to Träullit, or does it already serve as a good plaster carrier?

 

[lob]

I'm renovating a room in the basement of my house from 1946. One of the walls is clad with Träullit. See image
I'm planning to apply new plaster as the old one is loose and falling off.

What plaster do you recommend? Does gypsum plaster, like Webers Gypsum, work? Or should I use a cement-based type like Weber base 224 plaster mortar C?

I'm also considering putting a steel mesh as reinforcement against the träullit before applying the plaster to make it hold better and possibly help the plaster adhere better. There's mesh in place now, and I think it's between the joints of the träullit boards. I plan to put mesh over the entire surface.

Does reinforcement mesh offer any advantage to help the plaster adhere better to Träullit, or does it still work well as a plaster carrier?

How did it go for you? What type of mortar did you use and how did you proceed? I have a so-called bränsleluckeöppnng in the basement where I need to plaster träullit.

 

[jonaserik]

regular plaster works fine, the shade might just vary, you start by applying a thin layer of plaster (sluring) and let it dry so the proper consistency has something to stick to. (Träulit is crap, nothing sticks to it) Then just plaster up to the right level, using plaster mesh can be difficult to get flat without bulging out so it ends up at the edge of the plaster, you can probably manage without mesh.

 

[lob]

regular plaster mix is fine, the shade might just vary, you start by applying a thin layer (slurring) and let it dry so the right consistency has something to adhere to, (Träulit is crap, nothing sticks to it) Then just plaster up to the right level, using plaster mesh can be difficult to get flat without bulging out at the edges, you can probably manage without mesh

Perhaps the damage at my place is too severe to simply "plaster" away? Maybe I need to fill it up with something first?

 

[jonaserik]

Not too big to fix, but a little more than just polishing, knock off everything that is loose, make sure that what is on the sides is well attached. You can advantageously reinforce the lower part with a piece of mesh (looks a bit deep) that you attach with long screws into the foundation, to get a decent joint against the old plaster, bevel it a little, then use regular looser plaster (fill the hole without smoothing) and build up to about 1 cm left for the last layer. On the corners of the sides, it's common to first place a board on one side and plaster, remove it, and place it on the other side and plaster again, that way you get a sharp corner, otherwise it's difficult to achieve that by trying to plaster a corner directly.