help please! tiling over mastic/board/plaster

[Unregistered]

Please help! I've stripped the tile boards off our bathroom walls and found lots of dried glue underneath. One wall is a stud wall made of board and the other walls are plastered. To get the glue off will take decades. My plasterer says he can't plaster over the board wall and that the cheapest and best way to prepare the walls for paint and some tiles is to use thick lining paper over the glue (which is flat, not proud and only flaking off in tiny areas). I've been reading your fab forums though which have made me question this advice.
What should I do? Is it possible to seal the plaster and board with something (not pva...I've been reading your comments!) without removing this glue? If I then used lining paper on the areas that I was planning to paint and left the areas I was planning to tile blank, would the tiles stick?
Please help; I'm a very inexperienced diyer whose husband wants his bathroom back!
Thank you.

[Stan001]

The best thing would be if you were to scrape the glue off the solid walls and then prime. As for the studwall, if you scrape that it could destroy it (I don’t have enough info) the ideal would be to rip down the old plasterboard and reboard. This is cheap and gives you a nice flat surface. Your new plasterboard will hold more weight (32kg per sq m) and be tile friendly, as apposed to skimming what you have (which would only give you 20kg per sq m), I have no idea what thick paper means.
So in some way the stud wall question is answered by the weight of tiles you are going to use. Do you have a piccy to show us?

[CON5933]

you don't say how big the room is, IF it won't take too much off the room you could either batten the walls and re-board or dot & dab some new boards on (i'd put some screws thru too once adhesive goes off) it's a cleaner way of renewing the walls..

[Unregistered]

thanks guys, much appreciated. So to recap, you're both basically saying that I can't ignore the glue and go ahead and put tiles over the top in a smallish splashback for the bath and sink, and to line the rest with paper ready to paint over. They won't take without removing the glue?

In answer to your questions, I haven't got a pic as our camera's bust unfortunately, and the room is a narrow tall bathroom, so I'd be reluctant to lose any more space by putting more boards up. I've also got an issue with not being able to remove the existing suite, so want to deal with the walls as they are at the moment if possible.

Oh dear! Thanks for your advice.