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Chimney mortar typically lasts 20 to 30 years, depending on its quality, local weather conditions, and maintenance. Over time, exposure to moisture, freezing, and thawing cycles can cause mortar to deteriorate, leading to cracks and gaps. Regular inspections and timely repairs, such as repointing or tuckpointing, can extend the lifespan of chimney mortar by ensuring the structure's integrity.

This is largely dependent on the size and hardness of the rock, but a range of tools might work, including hammers, chisels, rock hammers, sledge hammers, and more. You'll need a jackhammer for the very biggest rock-breaking jobs.

The cost of masonry work varies widely depending on the type of masonry along with common cost factors like size, complexity, location, and season. Most exterior masonry work done in freezing temperatures tends to cost more because of the preparation and protection involved to keep the masonry from freezing before the mortar cures properly. The average price ranges per project or square foot for different types of masonry include:

• Brick wall (fence, garden wall, etc.): $10–$45 per square foot

• Natural stone wall: $40–$110 per square foot

• Manufactured stone veneer: $20–$40 per square foot

• Brick home exterior: $10–$30 per square foot

• Brick siding: $3–$10 per square foot

• Stone siding: $35–$50 per square foot

• Brick step replacement: $20–$30 per square foot

• Brick wall repair: $20–$40 per square foot

• Chimney repairs: $160–$750 per project

• Tuckpointing: $5–$25 per square foot

No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.