Paint, limewash or mineral paint: choosing a finish for a brick house

Which finish suits which house

If you want a uniform, solid color and the brick is sound and dry, a breathable mineral paint is usually the most durable choice; if you want an aged, soft look where some brick shows through, limewash is the right tool; and a standard acrylic masonry paint works but can trap moisture in the wall. Before choosing any of them, decide whether the brick should be coated at all, because none of these is easy to undo. The right answer depends on the condition of the brick, how wet the wall gets and the look you want.

I am Andrey Shelokovskiy, owner of Nomad Painting, and exterior brick painting is one of our services. I am a petroleum engineer by training and a member of NACE, the corrosion engineers' association, and I spent six years at PPG Protective and Marine Coatings. Masonry is one of the surfaces where coating chemistry matters most, so I want to explain the choice the way I would explain it to a client standing in their driveway.

First decide whether the brick should be coated at all

Unpainted brick does not need paint to be protected. Fired brick and sound mortar have shed rain for a very long time without any coating, and in historic buildings preservation practice is clear about it: the Wisconsin Historical Society's guidance says that, according to preservation best practices, unpainted masonry buildings should not be painted. Your house may not be historic, but the reasoning behind that advice applies to any brick wall. A coating changes how the wall handles water, and once it is on, removing it is slow, messy and rarely complete.

People usually want to coat brick for one of three reasons: the color is dated, the brick has been patched and no longer matches, or the wall looks dirty. The last one is often solved without any coating. Brick and stone that have turned green or black are frequently covered in algae or mildew, and a stone and masonry cleaning specialist explains how that growth is removed with soft washing. Clean the wall first, live with it for a few weeks, and then decide whether you still want a new color.

If you do, the next question is which finish, and that comes down to moisture.

Why breathability decides most of this

Brick and mortar absorb water when it rains and release it as vapor when the sun comes out. That cycle is normal and harmless as long as the water can leave. A coating that forms a tight film on the face of the brick slows that release. Water that gets in from behind, through cracks, at the base of the wall or from inside the house, then sits under the film. Over time that can push the paint off in blisters and flakes, and on soft brick it can damage the brick face itself.

You can often see where a wall is already wet. White, powdery staining on brick, called efflorescence, is minerals carried to the surface by water moving through the masonry. If you see it, find the source before you coat anything. A coating will not fix the water, and the wrong coating will make the symptom worse.

This is why the industry has moved toward breathable, vapor-permeable products for masonry. For brick that genuinely needs repainting, the Wisconsin Historical Society recommends a highly vapor-permeable paint. Our own brick page describes the three systems we use in exactly those terms.

Standard acrylic masonry paint

The conventional approach is a masonry primer followed by an exterior acrylic paint. It comes in every color, it gives a clean, uniform look, and most painters know how to apply it. Our brick page says this system typically lasts 7 to 10 years.

The trade-off is moisture. Acrylic forms a film on the surface, and our own page notes that it can trap moisture in the brick. On a dry, well-detailed wall with good gutters and drainage, that may never cause trouble. On a wall that gets wet from behind, it is where peeling starts. When an acrylic coat fails on brick, it tends to fail in patches that have to be scraped and recoated, and every new layer adds to the stack.

Mineral paint

Mineral paints work differently. Instead of sitting on top of the brick as a film, they bond with the masonry. The product we use most for this is Romabio Masonry Flat, a mineral-based, matte paint that our brick page describes as chemically bonding with brick and being breathable, so moisture can still leave the wall. It is also low-VOC.

Our page states that Romabio Masonry Flat can last up to 20 years with little to no maintenance, and that is the main reason I recommend it to clients who want a solid color on brick for the long term. The look is flat and mineral rather than plasticky, which suits most brick architecture. Like any coating, it depends on preparation: the brick has to be clean and sound before it goes on, and existing glossy or non-absorbent coatings need a suitable primer first.

Limewash

Limewash is the oldest of the three and the most forgiving to the brick. It is made from lime and penetrates into the masonry rather than sitting on top. We use Romabio Limewash on exteriors, and on interior feature walls and fireplaces we also use limewash products such as Portola Lime Wash as a specialty finish. Our pages describe limewash as breathable, with a soft, chalky, aged appearance that develops a patina over time.

Limewash is not a uniform color. Some of the brick texture and tone shows through, and the finish is meant to weather gradually. Some homeowners love that look; others expect it to behave like paint and are disappointed when it softens over the years. If you want a crisp, even color that stays the same, choose mineral paint. If you want an older, European feel and are comfortable with gradual change, limewash is the honest choice.

The three side by side

Here is the comparison in short form, based on the systems we use and what our brick page states for each.

• Acrylic masonry paint: solid, uniform color, any shade; film on the surface that can trap moisture; typically 7 to 10 years per our brick page
• Mineral paint (Romabio Masonry Flat): solid matte color; bonds with the brick and breathes; up to 20 years with little maintenance per our brick page
• Limewash (Romabio Limewash): soft, chalky, variable color with brick showing through; penetrates and breathes; develops a patina and weathers gradually
• All three: depend on clean, sound, dry brick and on fixing any water source first

When the brick is already painted

Many brick houses were painted decades ago, and the question is what to put over the old coat. Here the existing paint decides much of the answer. A breathable finish over a tight old acrylic film will not make the wall breathe, because the old film is still there. If the old paint is sound, a compatible acrylic system may be the practical choice. If it is peeling in sheets, the failure is telling you something about moisture, and my guide on what peeling and chalking paint means explains how to read the pattern.

Layer buildup is its own problem. The Wisconsin Historical Society notes that many paint layers can lead to failure because the different paints are incompatible, and for buildings with three or more complete paint jobs it recommends removing all the paint with specialized chemical strippers. On a typical house, full removal is a major project, so we look closely at what is there and talk through the realistic options before recommending anything.

Preparing brick so the finish holds

Whatever the finish, brick has to be clean and sound. Loose mortar should be repointed, cracks investigated, and dirt, mildew and loose old paint removed. Be careful with cleaning pressure: the Wisconsin Historical Society warns against high-pressure washing on masonry, noting that it can drive so much moisture deep into the wall that drying before painting can take months, and that paint will not adhere to masonry with a moisture content above 15 percent.

Timing matters too. Brick holds heat and water, so we schedule exterior brick work around rain and the hottest hours, the same way we plan any exterior. My guide on the best time of year to paint an exterior in North Texas covers how we plan around Dallas weather.

Getting a recommendation for your wall

The right finish depends on things you can only judge on site: the brick type, any existing coating, signs of moisture, the condition of the mortar and the look you are after. When we visit, we check all of that, show you how each finish would look, and explain which one we would choose for your wall and why.

Color deserves its own attention on brick. A shade that looks soft on a paint chip can read much brighter across a whole facade in full Texas sun, and limewash changes again as it cures and weathers. Our brick work starts with consultation and color selection for that reason, and I encourage clients to look at a sample on their own wall, in morning and afternoon light, before committing.

The estimate visit is free anywhere in our Dallas–Fort Worth service area, and the quote is itemized so you can see the preparation, the product and the labor separately. Brick work carries our two-year limited warranty on labor and materials, like the rest of our painting.

Questions people ask me