Just my second post so hopefully I've got this in the right section...
I am looking for any advice/information anyone might be able to give with regards to my options here. My mum lives in a 2 story farmhouse built in the late 20's or early 30's. The walls are cast, although not very well, basically loads of stones and rocks used with poor quality concrete (apparently a lot of lime in the sand they used or something like that), about 18'' thick, and the external surfaces were plastered. The house has always had cracks on the surface of the plaster as long as I remember, two of the walls got so bad in the 80's that they were re-plastered but the cracks eventually came back, we used to just try to seal them up with silicon before every new paint job. In the last couple of years, water has been seeping through into the house in a few places, very noticeable after a few days of rain, plasterboard inside gets wet and wall paper peals off etc..
What could be done to provide a reasonably cheap solution to this? I understand external insulation would probably be the best solution, but the money is just not there. I was wondering about Evertex or something like that, but I have read some very negative reviews. Some kind of spray on sealer? I really don't know, any advice is greatly appreciated.