Cracks In Your Fireplace Are A Serious Fire Hazard: Here's How To Repair Them
If you notice that your fireplace has cracked or damaged bricks, you need to repair them before you use your fireplace. The firebox (the place where the fire burns) in most modern interior fireplaces is surrounded by thin fire-resistant panels that have the appearance of brick. Since the firebox panels are only about an inch thick, it's easy for cracks to penetrate through the entire panel. This allows heat and burning embers from the fire to escape from the back of your firebox and ignite the wood in your home, starting a major house fire.