Hi
We have cob/stone walls. Earlier this year they were plastered with gypsum plaster. Shortly after there was damp patches all along the bottom of the external and partition walls. An independant damp specialist said this was due to hygroscopic salts and the dampness was trapped behind the cementitious plaster.
We have removed the plaster and sprayed a salt neutralising product (acetic acid) on the walls. The walls are currently exposed and I am wondering what to do next.
Its obviously sensible to use lime plaster so the walls can breathe, but my concern is the salts will come back.
Ive spoken to a few lime plasterers, none of which have heard of hygroscopic salts.
Is there a salt resisting lime plaster mix that could be used?
If the salts do come back, will the lime plaster handle it better? (the moisture will evaporate)
Thanks
We have cob/stone walls. Earlier this year they were plastered with gypsum plaster. Shortly after there was damp patches all along the bottom of the external and partition walls. An independant damp specialist said this was due to hygroscopic salts and the dampness was trapped behind the cementitious plaster.
We have removed the plaster and sprayed a salt neutralising product (acetic acid) on the walls. The walls are currently exposed and I am wondering what to do next.
Its obviously sensible to use lime plaster so the walls can breathe, but my concern is the salts will come back.
Ive spoken to a few lime plasterers, none of which have heard of hygroscopic salts.
Is there a salt resisting lime plaster mix that could be used?
If the salts do come back, will the lime plaster handle it better? (the moisture will evaporate)
Thanks