My house is a cavity block (not cavity wall) house. A friend recently told me that insulating foam can be squirted in under high pressure to insulate the walls and there's a company that does this. Is this possible? It sounds a bit daft to me as the foam wouldn't be able to get into all the places you'd like it to, as opposed to how it would flow in a cavity wall.
Has anyone had this done? How did it work out? Was it expensive?
Has anyone had this done? How did it work out? Was it expensive?