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Yes. Black stains are more than an eyesore. Some black stains can pose health concerns, especially for those with asthma, allergies, or other respiratory conditions. Some stains can also damage the brick’s structural integrity, harming the mortar and resulting in more expensive repairs.

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

Yes, you can limewash surfaces other than brick. Plaster, stone, stucco, and concrete can all also be limewashed. Any porous surface that will absorb the wash is a good candidate for limewash, although it won’t help much with waterproofing. If you choose to limewash over paint, you’ll need to prep before applying it to avoid a powdery, chalky finish. Shiny surfaces like metal or glass can’t absorb limewash, so it’s not suited for these.

A traditional German schmear uses mortar, making it unsuitable for adherence to painted surfaces. Professionals recommend removing any existing paint before applying mortar. However, you can rough up the painted surface and clean it to test if the mortar will stick. Remember that the underlying paint's texture and color may affect the schmear's final appearance—so starting with a bare brick wall will ensure the ideal finish.