Best way to fill gap left by skirting

[tbear]

Hi All

Just in the process of tiling my bathroom floor and walls, floorboards have been replaced with WBP and the walls are original plaster. The majority of the plaster seems sound however I do have a few bits behind the bath that are loose and most annoyingly there is a gap at the bottom of all four walls where the skirting boards have been removed. Presume that the skirting was plastered down to as a cost saving method in the 30s..

Is there a standard method of filling in these gaps, plasterboard maybe? And if so does the plasterboard need to be sealed in some way?

Thanks in advance..

 

[Burnerman]

If the missing plaster is fairly deep, fix lengths of plasterboard (or cement board if you prefer) to the wall and skim over the top.....if its shallow you could maybe get away with a tub of patching plaster....but don't overdo the thickness or it'll sag.
John