plaster skim missing

[waterfd]

Hi, Just been to look at a job and the previous tiles have been removed. As would be expected the plaster skim has come off on most of the walls. The base coat is not a bonding coat but sand and cement. When rubbed the surface is quite loose IE. the sand rubs off. I will be using a cement based adhesive (Mapei Kereflex) would it be OK to prime the walls and tile, or would you get the walls re-skimmed? If so how long would you wait before tiling?

 

[doug boardley]

I'd take the loose off with the flat of the trowel and then prime it with Primer G, this should stabilise the loose dust, then tile

 

[Peter]

Same here, more stable substrate to tile onto than skim.

 

[Rich]

If the wall is not to bad then I agree with the above, but if your unsure and dont want to wait for plaster to dry, could you over board with a backer?

 

[White Room]

I'd use a thinned out sbr so it soaks right through the render

 

[waterfd]

Thanks guys. Must say this is the first time I have hit this problem so I am now happy to continue without the plaster skim.