How do I fix paint that is peeling off interior walls in my older Saint John home?

Peeling interior paint in an older Saint John home almost always points to a moisture problem, a failed adhesion bond from a previous paint job, or both — and the fix starts with identifying and addressing the source, not just scraping and repainting over the same surface. Painting over peeling paint without solving the underlying cause is the single most common and most expensive painting mistake NB homeowners make.

Saint John's older housing stock — particularly the Victorian and early 20th-century homes in the North End, South End, and the Lower West Side — was built before modern vapour barriers and insulation standards. Many of these homes have walls that breathe moisture from both inside and out. If the peeling is happening in a bathroom or kitchen, the culprit is almost always inadequate ventilation combined with high humidity. If it's on an exterior-facing wall in a bedroom or living room, suspect moisture migrating through the wall assembly from outside, especially if the exterior painting hasn't been maintained.

Start by fixing the moisture source first. In a bathroom, check that the exhaust fan is actually ducted to the outside (many older Saint John homes have fans that vent into the attic — useless for humidity control) and use it during and for 20 minutes after every shower. In a kitchen, the range hood should vent outside, not recirculate. If you're seeing peeling on exterior-facing walls outside of wet rooms, you may have a failed exterior paint job allowing water infiltration, or a lack of interior vapour barrier — those are bigger problems that deserve a professional moisture assessment before you repaint.

Once the moisture source is addressed, here's how to fix the wall:

Scrape all loose and peeling paint thoroughly with a wide putty knife or paint scraper. Don't just scrape the lifted edges — test adjacent paint by pressing firmly with your fingernail. If it pops off easily, it needs to come off now rather than after you've repainted over it.

Sand the feathered edges of the remaining paint so there's no hard lip between the scraped area and the intact paint. Hard edges will telegraph through the new paint as visible ridges.

Apply a stain-blocking primer like Zinsser BIN (shellac-based, $45–65/gallon) or Kilz Original over the scraped areas — and the whole wall if peeling was widespread. This seals the surface, blocks stains, and gives the new topcoat something to grip. Do NOT skip this step and go straight to topcoat.

Fill any gouges or surface damage with lightweight spackling compound, let dry, sand smooth, and spot-prime those areas before painting.

Apply two full coats of a quality interior latex in the appropriate sheen — eggshell or satin for most rooms, semi-gloss for bathrooms and kitchens where moisture resistance matters most. Premium paints like Benjamin Moore Aura or Regal Select ($65–75/gallon) have better adhesion properties than budget options in high-humidity environments.

If the peeling is widespread throughout the house and you're seeing it in multiple rooms across multiple wall surfaces, it's worth having a professional painter assess the situation before you invest in materials. Some older Saint John homes have layers of oil-based paint over latex, or vice versa, that are fundamentally incompatible — no amount of new topcoat will fix that without stripping back to bare wall. In those cases, a professional skim coat and fresh primer before painting is the right call.

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