How To Paint Outside Brick: Professional Guide For Long-Lasting Results

Painting exterior brick requires specialized masonry primers, vapor-permeable elastomeric or 100% acrylic latex coatings, and meticulous surface preparation to prevent moisture entrapment and peeling. By following proper moisture testing, thorough power-washing protocols, and applying breathable formulations, you can successfully transform your home's exterior while protecting the masonry substrate for decades.

Pre-Operation & Equipment Checklist

Transforming exterior brick is a multi-step masonry restoration project that demands more than standard house paint. Because brick is a porous, hygroscopic material, treating it like wood or vinyl siding will lead to catastrophic coating failure. Success relies on gathering the right chemical formulations, personal protective equipment, and surface restoration tools before touching a brush.

• Essential Gear, Tools, and Materials:

  
  
  
  • 3000 PSI gas or electric pressure washer with a 25-degree fan tip
  • Masonry scraper, wire brushes, and heavy-duty scouring pads
  • Low-pressure commercial pump sprayer for cleaners and primers
  • High-grade synthetic bristle brushes (nylon-polyester blend) and 3/4-inch to 1-inch nap roller covers for textured masonry
  • Tri-sodium phosphate (TSP) or specialized masonry cleaner
  • Alkali-resistant, breathable, water-based acrylic-masonry primer
  • 100% acrylic latex or elastomeric exterior masonry paint with high permeability ratings
  • Premium exterior polyurethane or polyether-based masonry sealant for tuck-pointing repairs
  • PPE including safety goggles, chemical-resistant gloves, and an N95 respirator

• Mandatory Prerequisite Knowledge & Standards:

  
  
  
  • Ambient and surface temperatures must remain between 50°F and 90°F throughout application and the 48-hour cure window.
  • Relative humidity must be below 85%, and there must be zero risk of precipitation for at least 24 hours post-application.
  • The brick must pass a 24-hour plastic sheet moisture test to ensure trapped vapor will not delaminate the new coating system.

• Estimated Budget and Duration Benchmarks:

  
  
  
  • Average material cost ranges from $1.50 to $3.00 per square foot for premium primers and breathable masonry paints.
  • Total project duration spans 3 to 5 days, heavily dependent on drying times for pressure washing and deep mortar repairs.

Step-by-Step Exterior Masonry Painting Workflow

Step 1: Surface Cleaning and Efflorescence Removal

1. Inspect the entire masonry facade for structural cracks, crumbling mortar joints, and active efflorescence (the white, powdery salt deposits pushed out by moisture).
2. Remove loose mortar, dirt, biological growth, and old flaking paint using a stiff wire brush and scraping tools.
3. Apply a specialized masonry cleaner or a mixture of TSP and warm water to the brickwork using a pump sprayer, allowing it to dwell for 10 to 15 minutes without drying out.
4. Rinse the brick thoroughly with a pressure washer, keeping the wand at least 12 to 18 inches away from the surface at a pressure not exceeding 1500 to 2000 PSI to avoid eroding the soft clay or disintegrating the mortar joints.

Warning: Never use muriatic acid for standard cleaning unless dealing with severe mortar smears, and if used, neutralize it completely with a baking soda solution to prevent the acid from destroying your new paint's chemical bond.

Step 2: Masonry Repair and Tuck-Pointing

1. Allow the cleaned brick surface to dry completely for a minimum of 48 to 72 hours. Test the moisture content with a digital meter, ensuring levels read below 12% before proceeding.
2. Chip out any cracked, loose, or crumbling mortar joints to a depth of at least half an inch using a chisel and hammer or an oscillating multi-tool.
3. Pack fresh exterior-grade masonry patching compound or mortar into the joints using a tuck-pointing trowel, striking the joints to match the surrounding profile.
4. Fill any deep structural cracks or damaged brick faces with a paintable, elastomeric masonry patching compound. Allow all repairs to cure according to the manufacturer specifications, typically 5 to 7 days.

Step 3: Application of Alkali-Resistant Masonry Primer

1. Mask off windows, doors, trim, lighting fixtures, and concrete walkways using heavy-duty painter's tape and plastic sheeting.
2. Apply one coat of a high-performance, alkali-resistant, water-based acrylic masonry primer using a heavy-nap roller or airless paint sprayer.
3. Back-brush the primer immediately using a synthetic masonry brush to force the liquid deep into the microscopic pores, pits, and textured crevices of the brick and mortar.
4. Let the primer cure completely for a minimum of 12 to 24 hours, ensuring the high alkalinity of the concrete mortar is neutralized so it will not degrade the topcoat.

Pro-Tip: Never skip the primer on exterior brick; unprimed brick will absorb the moisture from standard paint unevenly, causing flashing, inconsistent sheens, and premature peeling.

Step 4: Applying Breathable Finish Coats

1. Select a 100% acrylic latex or elastomeric exterior paint specifically formulated for masonry, ensuring it has a high perm rating to allow trapped internal wall moisture to escape safely as vapor.
2. Cut in all tight corners, mortar lines, and detailed trim areas with a high-quality angled brush, working in sections to maintain a wet edge.
3. Roll the field areas using a 3/4-inch to 1-inch thick nap roller sleeve, applying paint generously to ensure total coverage inside the textured face of the brick.
4. Apply a second coat after the first coat has cured for the recommended recoat window, usually 4 to 6 hours, to achieve a uniform, UV-resistant, and weather-tight protective shell.

Paint and Primer Technical Specifications Comparison

Common Site Failures & Field Fixes

• Blistering and Peeling Within Months of Application

  
  
  
  • Root Cause: Moisture was trapped inside the brick substrate due to painting un-cured damp masonry or using a non-breathable oil-based paint.
  • Actionable Fix: Strip the failed coating down to the bare brick using an environmentally safe paint remover, allow the brick to dry completely for several weeks, verify internal moisture levels, and reapply an acrylic masonry primer and breathable acrylic latex topcoat.

• Efflorescence Push-Through After Painting

  
  
  
  • Root Cause: Soluble salts behind the brick migrated outward and crystallized beneath the paint film because the masonry was not properly neutralized or cleaned.
  • Actionable Fix: Scrape away the bubbled paint flakes, scrub the affected areas with a dry brush or specialized salt neutralizer solution, let dry, spot-prime with an alkali-resistant sealer, and touch up the finish paint.

• Fading and Chalking on Sun-Exposed Walls

  
  
  
  • Root Cause: Use of interior-grade paint or cheap low-solids exterior paint that breaks down rapidly under intense ultraviolet radiation.
  • Actionable Fix: Power-wash the chalky residue away completely using a soft bristle brush attachment, let the wall dry, and apply two fresh coats of a high-grade 100% acrylic exterior paint with advanced UV-blocking pigments.

Frequently Asked Questions

Can I paint brick that has been previously painted?

Yes, provided the existing paint is structurally sound and adhering tightly to the surface. Scrape away any peeling areas, feather the edges smooth with sandpaper, clean the entire facade to remove chalking residue, spot-prime the bare masonry spots, and apply your topcoats over the entire wall.

Do I need a special paint for exterior brick?

You must use a formulation explicitly designed for masonry substrates, such as a 100% acrylic latex or elastomeric paint paired with an alkali-resistant primer. Standard wood or drywall paints lack the chemical resistance to handle alkaline mortar and will quickly degrade or trap destructive moisture.

Will painting brick cause mold or structural damage?

Painting brick will only cause structural issues or mold growth if you use a non-breathable oil-based coating or paint over damp masonry. Using vapor-permeable acrylic masonry systems allows internal wall moisture to evaporate safely through the brick without compromising the coating integrity.

How often will I need to repaint exterior brick?

A professionally prepped and applied 100% acrylic exterior masonry paint job typically lasts between 10 and 15 years before requiring maintenance. Longevity depends directly on environmental exposure, local climate severity, and the thoroughness of the initial surface preparation.

Can I spray paint exterior brick instead of rolling?

Airless paint spraying provides exceptional coverage across deeply textured brick faces and rough mortar joints, but you must always back-brush the wet paint immediately. Back-brushing forces the pigments into the microscopic pores of the masonry, guaranteeing a mechanical bond that spraying alone cannot achieve.

Protect and Enhance Your Property Today

Investing time in proper preparation, moisture testing, and breathable masonry formulations ensures your exterior painted brick resists the elements while maintaining its structural integrity for years to come. Start your restoration project today by inspecting your masonry joints and selecting high-performance alkali-resistant primers designed for long-term durability.