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You should use cement for a chimney crown. The purpose of the chimney crown is to protect the mortar below from water damage and the effects of weather. For this reason, chimney crowns should only be made using cement. When repairing a crown, use caulks and sealants designed for cement repair rather than mortar repair.

Yes, professionals have the skills to restore historical or intricate masonry by respecting traditional techniques and materials. They address damage meticulously, preserving the original design while ensuring stability and longevity.

It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.

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