What paint should I use on exterior concrete foundation walls in a Fredericton home?

For exterior concrete foundation walls in Fredericton, use a masonry-specific elastomeric or 100% acrylic masonry paint rated for below-grade and freeze-thaw conditions — NOT standard exterior house paint, which will peel off concrete within one or two winters. The right product choice and thorough surface prep are what separate a paint job that lasts 5–10 years from one that bubbles and flakes off by spring.

Concrete foundation walls present a unique combination of challenges: they're porous, they're in contact with soil and groundwater on the back side, they experience severe freeze-thaw stress in Fredericton's climate (the St. John River valley sees cold, hard winters with reliable frost from November through March), and they're often contaminated with efflorescence — the white chalky mineral deposits that leach out of concrete over time. None of these challenges are dealbreakers, but each one needs to be addressed before paint goes on.

Surface prep for concrete foundations:

Start by removing all loose paint, efflorescence, and dirt. A stiff wire brush, a pressure washer at moderate pressure, and a masonry chisel for stubborn areas will handle most of this. Efflorescence must be removed completely — paint applied over efflorescence will peel as the minerals continue to migrate to the surface. Use a commercial efflorescence remover (muriatic acid diluted to roughly 10%, or a dedicated product like Drylok Etch) applied according to directions, then rinse thoroughly. This also opens the pores of the concrete and improves paint penetration.

Fill any cracks wider than 3mm with a hydraulic cement or concrete patching compound before painting. In Fredericton's freeze-thaw climate, water gets into any unsealed crack, freezes, expands, and makes the crack worse every winter — paint alone will bridge a hairline crack but won't seal a structural crack. Allow all repairs to cure completely (typically 24–48 hours minimum) before painting.

Paint selection:

Elastomeric masonry paint is the premium choice for Fredericton foundation walls — products like BASF MasterSeal or Sherwin-Williams ElastoShield stretch and contract with the concrete through freeze-thaw cycles without cracking. They also bridge hairline cracks up to 1–2mm. These products run $50–80/gallon and go on thick, typically at coverage rates of 50–75 sq ft per litre. They're the right call for any foundation with a history of moisture entry or active efflorescence.

100% acrylic masonry paint (like Drylok Masonry Waterproofer, or Benjamin Moore MasonrySealant products) is the most common choice for above-grade foundation walls and exposed concrete — $40–60/gallon, good durability, and widely available at hardware stores in Fredericton. Apply two coats, brushing the first coat into the pores of the concrete rather than rolling it on.

What NOT to use: Standard exterior latex house paint ($55–80/gallon for premium grades) is not suitable for concrete. It can't bond to the porous, alkaline surface without a proper masonry primer, and even with primer it lacks the flexibility and moisture resistance needed for a foundation wall. Epoxy paint works well on horizontal concrete (garage floors, patios) but is unnecessarily expensive and difficult to apply on vertical foundation walls.

For a typical Fredericton bungalow foundation (exposed concrete wall perimeter of 50–80 linear feet, roughly 1–1.5 metres exposed above grade), a professional exterior foundation paint job including prep and two coats runs approximately $500–1,500 depending on height exposed, the amount of repair work needed, and accessibility. This is a manageable DIY project for a homeowner who's comfortable with a wire brush and a stiff paint brush — just take the prep steps seriously and don't rush the drying time between coats.

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