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Crack, pit, fireplace mortar joints begin to fail - In an unprotected fireplace, heat is absorbed into the firebox back wall which causes the firebricks to crack and the fireplace mortar that holds the firebricks together to breakdown, leading to expensive fireplace chimney repairs.
Direct combustion heat expansion & contraction exposure - When burning a fire, the fire requires oxygen to burn. So it draws air in from the room. As the air is drawn into the firebox, it pushes the heat and flame towards the rear firebricks of your firebox. This causes an immense amount of expansion of the firewall. Then, as the fire dies out, your firebricks begin to contract (cool). This process is repeated every time you use your fireplace.
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