Cracking is a major problem especially in older chimneys. Many factors play a role in the deterioration of brick and mortar. Not all bricks are created equal !

Weak, cracked or missing mortar will cause creasote to bleed through the chimney. This makes for a smelly and dangerous situation. If a chimney fire happens, the fire will follow the fuel (creasote} through the chimney wall and start a fire in the living space.

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Lining Process Page