Tile backer board

[marsaday]

On my new wall in the bathroom i will have 2 cement boards where the shower will go, but the rest of the wall will be plasterboard. Can i plaster the cement boards?

If not then it will make the wall uneven for tiling.

 

[1john]

You can, but if you skim them then whats the point in them being there??

 

[jrplastering]

naa its common practice to feather into the area where the cement boards are just make sure the plasterer feathers down into the cement boards as soon as the tiles, paint and tile bead go up you wnt even see it mate

 

[Richard C]

As JR says, it’s common practice where the two meet; some cement boards will accept Multi but others may need prep (e.g. Aquapanel) so check which you have. Knauf actually say Aquapanel can’t be skimmed with conventional Gypsum & point you towards their nice & expensive "special" plaster but I regularly blend over with Multi (as in this case) or for making/skimming services access panels. I apply a couple of strong PVA sealing coats & leave to dry for at least 24 hours & then damp down with me spray bottle before skimming, just enough to “liven” the PVA again; haven’t had any fall off yet.

 

[marsaday]

Ok so no skimming then.

 

[Richard C]

No don’t skim backer board before tiling or plasterboard either if your tiling that, it’s not necessary & reduces the maximum tile weight you can hang.

As 1john said there is no point; both JR & I thought you were talking about blending in a section of PB that isn’t being tiled but being plastered for paint/paper.

 

[1john]

Research a little on this site, you wont have to look too far, infact almost every other post Richard C writes is about tiling and the best methods, what weights certain substrates will hold ect ect....