Why your fireplace mortar cracks and how to fix the damage yourself

Mason Mark McCullough and host Kevin O’Connor demonstrate how to address common cracks in brick fireplace surrounds. They explain why these fissures appear even in newer installations and provide a straightforward method for restoring the mortar using basic masonry tools.

Cracks along mortar joints are a frequent occurrence in fireplaces, often stemming from the natural movement of the structure, flaws in the original installation, or the varying expansion and contraction rates of different building materials. While these gaps can be unsightly, they are typically cosmetic rather than structural.

The repair process involves removing the damaged material and applying fresh mortar to the joints. By addressing these issues, homeowners can maintain the appearance and integrity of their fireplace, which serves as a key component of their home investment.

Source: How to Repair Brick Fireplace Surround Cracks | Ask This Old House