internal wall loose surface?

[cupcake14]

Hi,my bathroom need a bit retiling. I knocked some loose tiles off. There are two coats on the brick wall. One is cement base with thickness around 10mm. The other pale red-Brown coat on the surface is much thinner with thickness around 1-2 mm. The thinner coat is loose.
I was wondering how can I redo the thinner surface Is this a
Plaster surface? Is it OK for me directly tiling on the cement coat without redo the thinner surface?

Untitled

• cupcake14
• 16 Dec 2013
• 2

 

[roughcaster]

Definitely remove all ALL the pink finishing plaster. If the backing coat is cement render, and is "sound", give it a clean off, remove dust etc, then you'll have an ideal surface for tiling onto.

 

[cupcake14]

Thank you very much indeed.
Do you think the pink finishing is plaster? It is quite thin and it's bathroom wall. Is it possible to redo the pink finishing and paint it? The cement render is sound.

Definitely remove all ALL the pink finishing plaster. If the backing coat is cement render, and is "sound", give it a clean off, remove dust etc, then you'll have an ideal surface for tiling onto.

 

[roughcaster]

The thin coat of pink will be a finishing plaster of some kind, probably put on years ago. If the render base coat is as sound as you say, it can easily be plastered over again with finishing plaster. As i said yesterday, be sure to remove all the old pink skim coat, clean off all the dust, then damp down and seal the render with pva and let it dry. Once the pva has dried, pva the wall again then skim onto it while it's still wet/tacky.
If you do decide you're going to re-tile the wall, there's no need to skim it. A rendered surface is far stronger to tile onto than a plastered/skimmed surface.