Hollow plaster? Advice and information on tiling and fixing tiles to a variety of surfaces

[Bookworm]

Hi All. For a bathroom renovation we are removing the old tiles and retiling from floor to ceiling. The current tiles only go half way up the wall. However, after removing a few tiles from an exterior wall, some of the plaster sounds hollow when you tap it, and where some of the top layer of plaster has broken away, the plaster behind is little more than powder. The plaster above the current tile line seems hard and firm. I assume that I should remove all the plaster where it sounds hollow because it will not support the weight of the new tiles which are bigger and thicker? If so, could I remove all the plaster and replace it with plasterboard? If that is possible, how should I fix the plasterboard to the bricks? My house was built in the 1930's.

Cheers, Mark

[welsh brickie]

your right remove all the plaster down to the brickwork.Then paint a pva solution on the wall to seal it
Then you can dryline the wall using dry wall adhesive to stick the plasterboard to the wall.

[Bookworm]

Thanks Welsh Brickie, I'll give that a go