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While painting can certainly change the look of a chimney, you should think twice about giving your brick chimney the old landlord special.

Painting brick is porous, meaning it’s full of tiny holes that can soak up moisture. Those holes also allow it to dry, though. So, when you paint it, you trap any moisture inside, providing an opportunity for mold, mildew, and water damage.

Paint also shows wear faster than naked brick. This means that once you paint a brick surface, you’ll have to keep painting it to maintain a clean look. A paint job is also harder to undo on brick because of its porous nature. Once you paint it, it’s hard to go back without some serious power washing—another added cost.

In most cases, painting your brick house is a fine idea that can open up new aesthetic possibilities. However, the paint can slightly shorten the life span of brick, especially if moisture gets trapped underneath the paint layer. Once you paint, you’ll have to keep up with maintenance to avoid flaking and blisters.

Yes, limewash on brick can accumulate dust over time. Its porous nature can attract dust particles, especially in environments with high levels of dust or dirt. Additionally, if the limewash surface is left unsealed, it may be more prone to collecting dust. Additionally, incorrectly applied limewash will generate dust. Causes include applying it too thickly instead of thin layers and not allowing enough drying time between layers. Regular maintenance, such as gentle cleaning or dusting, can help mitigate dusty issues.

If you’re attempting to mix and pour your own mortar, expect to pay between $5 to $10 for an 80-pound bag of mix. The cost to repair mortar, however, can range from $300 to $500 for a 20-square-foot wall. The larger the area and the more extensive the repair, the higher the cost.