I'm going to install a gas fire in the next couple of weeks. The existing fireplace is quite large and I need to fit some kind of board over it, leaving a cavity just large enough to mount the fire. What is the best material to use for this and who sells it?
Years ago whilst assisting my dad in doing a similar job, we used a rigid, mineral (non asbestos) composite board that was resistant to high temperatures. I can't recall where this came from. Any pointers?
Best regards, Jim