Cracks and small gaps will not matter, but if sections are missing, certain areas of stoves will overheat and burn and crack. Keep up on your bricks, it is preventative maintainence for cast iron stoves.Click to see full answer. Also know, why has my fire brick cracked?Fire bricks have a low thermal conductivity – meaning heat does not pass through the fire bricks, instead they reflect heat back into the firebox of the heater to ensure a hotter and more efficient burn. If you notice large cracks resulting in your brick being in a number of pieces – it is time to replace it.Secondly, can you cut firebrick? Normal firebrick is easy to cut with a “masonry” blade on a skil saw. A cold chisel can be used- score each corner, then each face, then a sharp strike- but ti will never be clean or accurate as a saw cut. Similarly, how do you repair a cracked brick fire? Start by scrubbing excess ash and dust from the walls of the fireplace to expose the brick. Then clear any loose mortar from the firebox floor and walls. Repair the joints using heat-resistent mortar. After some drying time, clean up the joint lines for a smooth finish.When should you replace fire bricks? When to replace firebricks If a brick is well supported on three edges then it can remain in place. As a general rule a single hairline crack is not a problem. Replace if it looks like it could fall into the fire. Replace if you can see the stove wall behind.
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