Sand and cement backing coat to be removed. I know about renovating plaster thanks...
Need to prevent salts coming back through as you know as brickwork still damp as you know as brick work dries salts can form on render. Want to prevent them coming through, will be using lime render. Never heard of unilit.....what's the make up? is it possible to make something similar with NHL5...is there a certain additive or sand?