Stucco Painting in Calgary

Stucco is the dominant exterior finish across large parts of this city, and it takes a beating here that it would not take in a milder climate. Three things work on it at once.

Freeze-thaw cycling. Stucco is porous. It absorbs moisture and releases it again, and every time water inside the surface freezes it expands. Calgary delivers a great many of those cycles, and chinooks compress several into a single week. That is what opens up hairline crazing and, eventually, lifts patches off the substrate.

High-altitude UV. The sunlight here breaks down pigment and binder faster than most people expect. South and west elevations chalk and fade years before the sheltered sides of the same house, which is why so many Calgary homes look like two different colours depending which way you approach them.

Movement. Temperature swings move the building, and stucco moves with it. A coating that cannot flex with that movement cracks along the stress lines — typically at corners of window and door openings.

A coating is what stands between all of that and the substrate. Once it has lost its film integrity, water gets in freely and the freeze-thaw cycle starts working on the stucco itself rather than on the paint.

Washing, carefully. The surface has to be clean — dirt, chalking and growth on shaded elevations all prevent adhesion. But excessive pressure damages stucco and drives water into the wall, so it is washed at a pressure the substrate can take rather than blasted. It then has to dry through, which in practice often means a day or more before coating.

Crack repair. Hairline crazing can often be bridged by the coating. Anything wider needs filling with a flexible patching material suited to stucco and allowing to cure. Painting over an open crack hides it for a season, and then it reappears wider because water has been getting in behind.

Caulking and sealing. The joints where stucco meets window and door frames, and any penetration through the wall, are the routes water actually uses. Sealing those matters more to the life of the job than the finish coat does.

Priming where it is needed. Bare or patched stucco is highly absorbent and alkaline. A masonry-appropriate primer evens out that absorption so the finish coat builds consistently instead of flashing in patches.

Stucco is coated by spraying and immediately back-rolling. Each half of that matters. Spraying delivers coating into the texture quickly and at a consistent build; back-rolling straight afterwards works it down into the profile so the deep parts of the texture are actually coated rather than bridged over.

Spraying alone tends to skin across the surface, leaving hollows behind the texture that fail early. Rolling alone is slow, hard to keep even across a large elevation, and struggles to reach into a heavy texture at all. The combination is what gets full coverage in the profile — and on a heavily textured wall it uses considerably more product than a flat surface of the same area, which is worth knowing when comparing quotes.

• Product chosen for your wall, not a default — breathability is the decision that matters.
• Cracks repaired, not painted over.
• Sprayed and back-rolled, so the texture is coated rather than bridged.
• Washing at a pressure stucco can take, then proper drying time before coating.
• We will not coat outside the temperature window, whatever the schedule says.