I was adding some insulation foam into our fireplace as a way of stopping drafts from the chimney. It's obvious that it's installed so we won't ever have it there when a fire is lit (we have not yet used the fireplace since buying the house, though we have had it inspected and swept).
However, when installing it, I discovered that between the fireplace facia and fireplace itself around the edge of the opening into our lounge is stuffed some fibreglass insulation. It looked from what I could see that it was somewhat loose and I wondered if it too should be removed before lighting a fire in that fireplace? I can't be sure but I could see that it would certainly get very hot there and may even come into contact with the flames. Is this normal or should I remove this insulation?
Best Answer
This is sometimes rock wool insulation. Even if not, fiberglass insulation is non-flammable, as long as no vapor barrier is used with it.
Installation of fireplace doors and fireplace inserts usually includes such insulation.