Hello We have a problem with some of our internal walls. There is a line of salt deposits appearing which is causing the paint to bubble & plaster to crumble. The walls previously had vinyl wallpaper which when stripped off had black mould underneath. The walls were unpainted bare plaster. We cleaned off the mould with a bleach solution & painted with emulsion. Soon after the salt deposits appeared. The problem areas (where we can see them) are the kitchen walls, the conservatory wall (adjoining the kitchen), toilet wall (adjoining the kitchen) & dining room wall (adjoining the toilet). It seems like rising damp but we're thinking it may be condensation because the affected areas are all hot/cold rooms. We would be grateful for any information or experience anyone has. Tony.