Dear Forum Renovators,

I would be really grateful if anyone would be kind enough to advise me how to proceed with the bathroom in my tiny old stone cottage. Have pulled all the hideous tiles off and the plaster came too, lime hair and all, leaving stone exposed on the outside wall, brick on the party wall. The inner walls are plasterbaord.

How do i deal with this best, i had thought i would get rid of the shower altogether due to condensation it causes (very tiny window), so i just got my Dad to disconnect it. I don't intend to put an extractor fan through the thick stone outer wall or through the dodgey lath ceiling.
1)I would like to clean up and retain the brick party wall - is that crazy and how do i seal it?
2)The party wall and outside stone wall aren't tied in (see the gap, first pic right hand side)- would should i fill the gap with - expanding foam stuff or eco lime mortar or another idea?
3) should i use battons or the dib and dab technique with waterproof plasterboard to line the external wall and inner walls to try to waterproof the room?
4) should i really be knocking off all the plaster from the external wall (rather than patching with aglaia filler like i have in the other rooms in order to repair the poor plaster?)
Oh and there is crap cement render on the outside of the external that some nut smeared on at some point so my wall won't breathe too good

I would very much appreciate any ideas or advice anyone may have. Sorry if the questions are a bit dumb i'm mostly doing this by myself.

Here are a couple of pics - warn you it's not pretty don't look if you're eating and i'm not responsible for the pink sanitary ware!
http://i1067.photobucket.com/albums/u430/tearindownthehouse/Elainehouse001.jpg
http://i1067.photobucket.com/albums/u430/tearindownthehouse/Elainehouse004.jpg

Thank you very much

Thanks Tony, that's definitley food for thought. So basically sort of waterproof it internally? If this isn't a stupid question would the fan extract up through the plywood into the roof cavity, is that what you mean ? Gutted at losing my warm brick wall but maybe it's just not practical. Artists and pragmatists !

Don't use foam to seal the party wall to the external, not very good acoustically. You would be much better packing with mortar as best you can, and then use a flexible silicone mastic to seal over the top of that.

Can't help much with the other questions.

Thanks Tony , i'll use tub of lime mortar and shove it into the gap.

Thanks Peter, fan is clearly going to involve a lot of cost and outside help for sure ...