Hi this is my first post. I have recently moved into a 1950's house. Unfortunately it seems that the previous occupants had a leak in the loft and there was damage to the ceilings in two bedrooms. On closer inpection, the ceiling has been replaced by hardboard rather than plasterboard. Is this contrary to building regs? I am under the impression that the ceiling should be made of a non/low combustable material.
I am also somewhat surprised that this was not identified during the survey process. Can someone please offer some advise.