How Do You Properly Prepare for Painting Exterior Brick?
Painting exterior brick gives your home a refreshed look while adding a layer of protection against weather damage. When approached correctly, painting exterior brick is a lasting investment that stands up to harsh weather. Done right, it can last for years — but the key is preparation, the right paint, and correct application technique. Before you pick up a brush, there are several things to understand: brick is porous, it holds moisture, and not all paints bond well to it. Skipping prep steps is the most common reason this type of project fails early. Whether you want a bold new colour or simply want to protect aging masonry, the steps covered here will help you get it right the first time. What Does Painting Exterior Brick Actually Mean? Applying paint directly onto a masonry surface on the outside of a building is different from painting drywall or wood siding. Brick has a textured, porous surface that absorbs moisture and expands slightly with temperature changes. That means regular latex paint may not be enough on its own. When done properly, painting exterior brick seals the surface, reduces moisture penetration, and dramatically changes the curb appeal of a home. Many homeowners in Winnipeg choose to update their masonry to modernize older homes or unify the look of mixed exterior materials. It is important to know that once you commit to painting exterior brick, it is very difficult to reverse. The paint soaks into the pores of the brick and mortar, which means stripping it later requires significant effort. This is why choosing the right materials and doing thorough prep work matters so much. Things To Know Before You Start How to Prepare the Surface Before Painting Preparation is the most important part of any exterior masonry project. Rushing through this stage leads to paint that peels within a season. Clean the Surface Thoroughly Start by power washing the brick to remove dirt, dust, moss, and loose mortar. Use a pressure washer on a moderate setting — too much pressure can damage the mortar joints. If there is mould or mildew present, treat the area with a diluted bleach solution and scrub with a stiff brush. Rinse well and allow the surface to dry completely. If you see white staining (efflorescence), use a masonry cleaner or a mild acid wash to dissolve it. Rinse thoroughly and allow several days of drying time before moving forward. Repair Cracks and Damaged Mortar Once the surface is clean and dry, inspect every section of the wall. Fill cracks with a matching mortar mix or masonry caulk. Any holes, chips, or gaps larger than a fingernail should be patched. Painting over damaged brick does not hide the damage — it often makes it more obvious once paint is applied and dry. Apply a Masonry Primer A breathable masonry primer creates a consistent base for the topcoat to bond to. It also prevents the brick from absorbing too much paint, which would leave a patchy finish. Roll primer on using a thick-nap roller (at least 19mm) to push it into the texture of the brick and mortar. Let it cure fully before applying your topcoat. What Kind of Paint Works Best on Brick? Choosing the correct paint is just as critical as prep work. Here is a breakdown of the most suitable options for exterior masonry: Paint Type Best Use Key Benefit Elastomeric Paint Older or cracked brick Stretches with temperature changes, seals minor cracks Masonry Latex Paint Sound brick in good condition Breathable, easy to apply, wide colour range Mineral-Based Paint Historic or heritage masonry Bonds chemically, extremely durable Waterproof Masonry Paint High-moisture areas Strong moisture barrier, ideal for foundations Elastomeric paint is widely recommended for painting exterior brick in climates like Winnipeg’s, where freeze-thaw cycles put stress on masonry surfaces. It stays flexible so it does not crack when brick expands and contracts with temperature shifts. Avoid standard exterior latex that is not labelled for masonry use. It may look fine at first but will likely peel within a few years because it cannot handle the porosity and movement of brick. Step-by-Step Process for a Clean, Lasting Finish Once your surface is prepped and primed, follow these steps to apply paint properly. Choose the Right Tools The right tools make painting exterior brick far easier and give a more professional result. A thick-nap roller (19mm to 25mm) is the best tool for exterior masonry because it pushes paint into all the crevices. Use a smaller brush for mortar joints and edges. Sprayers can work on large surfaces but require more masking and cleanup. For most homeowners, a roller and brush combination gives the best control. Work in Manageable Sections Do not try to paint an entire wall in one session. Work in sections of roughly 1 to 2 square metres at a time. Apply paint generously, then go back over the section to even it out before the paint starts to set. This prevents lap marks where wet and dry paint meet. Apply Two Coats One coat is rarely enough. The porous surface absorbs the first coat unevenly. Let the first coat dry fully — usually 4 to 6 hours in warm weather — then apply a second coat for solid, uniform coverage. Watch the Weather Avoid painting in direct sunlight, on very windy days, or when rain is expected within 24 hours. Ideal conditions are overcast days with temperatures between 15 and 25 degrees Celsius. In Winnipeg, late spring through early fall offers the best window for exterior masonry work. Common Mistakes to Avoid Even experienced DIYers make errors when tackling masonry. Here are the most frequent problems and how to prevent them: Mistake Why It Happens How to Avoid It Skipping the primer Trying to save time Always use a breathable masonry primer first Painting wet brick Not waiting after rain Allow 7 to 10 days of drying time Using the wrong paint Choosing standard exterior paint Only use masonry or elastomeric formulas