How far do I strip back before new tiles?

[johnsonuk]

Hi all,

First time putting up tiles so please bear with me if I say something stupid.

I've taken down some old times and I am left with what appears to be three layers.

1.) Old adhesive from the tiles I removed

2.) Plaster (I suspect)

3.) Plasterboard

My question is - Do I need to strip back all the old plaster right back to the board? At first this sounds a silly thing to do but it doesnt look in a fantastic state. It looks very porus and brittle (A good dig with a metal scraper can take it off)

Even though this is in a bathroom, I am confused at to if I should apply a PVA coat first to seal the wall or would that ruin the new tile adhesive.

Thanks in advance.

 

[jefoss]

best way is rip out plasterboard and start from scratch dude

 

[gcol]

Ditto. Have a read of the sticky too.

 

[Richard C]

The plasterboard probably won’t survive in any meaningful state, rip it all off & start again. But, as suggested, read the superb sticky before you start renovation & also take a look back through the archive posts regarding plasterboard, wet areas & tiling in bathrooms to ensure you don’t make any costly mistakes.