I live in a Victorian house (1895) and I have noticed that the walls at knee height in the kitchen are bulging. When hit with a hammer the plaster comes off quite easily. I am considering having the fist meter of plaster removed and redone, but what is the best damp solution before I reapply? chemical injection? additives to the plaster? something else? what ratio of sand and cement should we be using?
Thanks for your help