another cottage job but walls are damp!

[Handyeire]

Was out today pricing a large bathroom in an old cottage and 2 of the walls are very damp all over the wall. Its already tiled and tiles have been on over 20 years and I noticed the damp where the customer already removed some tiles. I'm surprised these tiles are still on and TBH, they are well bonded to the wall as its tough to remove them.

I'm wanting to know what procedure you'd take after removing all tiles and its time to retile again.

 

[White Room]

What sort of walls has the cottage got....

 

[Handyeire]

What sort of walls has the cottage got....

Sorry, forgot to mention walls. They are old stone cottages with lime or cement floated on outside and in with same.

 

[White Room]

Another question, obviously solid walls and probably about 100 years old...

 

[Handyeire]

Another question, obviously solid walls and probably about 100 years old...

Yeah in and around 100yrs old!

 

[White Room]

Yeah in and around 100yrs old!

Found this and gives a good reason for the damp http://www.buildinglimesforum.org.uk/lime-plaster-in-a-shower