Why does paint keep peeling in one spot?

Localized, recurring peeling is a moisture report: water is arriving behind the film there, from a gutter, flashing gap, sprinkler, or an unvented interior source, and repainting without fixing the water reschedules the peel.

What is the difference between peeling and alligatoring?

Peeling lifts paint off the surface, usually moisture or adhesion. Alligatoring cracks the film into scaly patterns, the signature of thick, aged, many-layered paint failing cohesively, cured only by removal.

Why did my new paint job peel within a year?

Early failure is preparation: painting over chalk, dirt, gloss, or damp wood, or incompatible coats. Paint bonds to what it touches, and it touched something loose.

When does peeling paint involve lead?

Any pre-1978 house may carry lead paint in its layers, and peeling and sanding create the hazard. Test before disturbing, and use lead-safe practices or certified contractors for scraping on old homes.

Exterior Paint Peeling: Causes by Pattern

Page last reviewed: August 2026 · Reviewed by Harold R. Bennett, retired home inspector

Paint is a film, and films fail by letter of cause: water pushing from behind, bad bonds letting go between layers, thick old films cracking under their own history, and sun cooking solvents out too fast. Exterior paint peeling causes read from the failure’s pattern and address, and the reading matters because the most common cause, moisture, means the paint is the messenger, not the problem. This diagnostic covers the patterns, the addresses, the prep truths, and the lead rule that governs old houses.

Peeling to bare wood: the moisture pattern

Paint lifting cleanly off the substrate, curling back to bare wood, in localized zones is water’s signature: moisture entering the wood from somewhere, migrating outward, and pushing the film off as vapor from behind. The address names the source. Peeling below the roofline and at wall tops: gutter overflow and ice-dam paths. One wall stripe or a corner: a flashing or kick-out gap, or a downspout’s splash. Bottoms of walls and trim near grade: splash-back and grade moisture, sprinklers included. Around bathrooms and kitchens, or on walls that peel in winter: interior humidity migrating through walls that lack vapor control, the bath-fan and humidity economy written on the outside of the house, historically the reason whole eras of houses peeled after insulation retrofits. Window sills and sash bottoms: condensation’s runoff line plus weather. The rule the pattern teaches: recurring localized peel is a water diagnosis, and paint spent before the fix is rent, with the wood below graduating to the rot ledger if the cycle runs long, probe included.

The bond failures: intercoat peeling and early loss

Paint that peels between layers, new coat releasing from old, leaving prior paint intact underneath, is intercoat failure, and its causes are the preparation sins: painting over chalked, dirty, or glossy surfaces without washing and scuffing, over damp wood (moisture meters earn their keep at repaint time; wood wants to read modest before coating), incompatibilities like latex over unprimed slick alkyd, and painting in the wrong weather, dew, heat, or cold outside the label’s window. Whole-job early failure within a season or two files under the same letter. The prep truths that prevent it are unglamorous: wash, scrape to sound edges, sand the gloss, spot-prime bare wood (and stain-blocking primer over tannin and water stains), caulk the joints that want it and not the drainage that does not, and honor the recoat windows.

The film’s own aging: alligatoring, blistering, chalk

Alligatoring, the scaly, cracked-leather pattern, is a thick, aged, many-layered film failing cohesively, common on paint-museum Victorians, and no new coat cures it: the film strips (with the lead rule below governing) or the pattern telegraphs through. Blistering in sun-baked walls is solvent or moisture vapor bubbling a fresh film, the too-hot-too-fast failure, cut open to read (paint on the blister’s back says solvent and sun; bare wood says moisture). Chalking is normal UV aging, pigment powder on a rubbed hand, and its lesson is prep (wash before repaint) plus honesty that south and west walls repaint on shorter cycles, the same solar arithmetic as roofs. Mildew on shaded paint reads by the mold-versus-dirt tests and washes with the appropriate cleaner before any coating, painted-over mildew growing straight through.

The lead rule

Any house built before 1978 may carry lead in its paint layers, and peeling, scraping, and sanding are exactly the activities that turn intact lead paint into hazardous dust and chips, especially where children and gardens live below the work. The practice: test before disturbing (kits screen; labs confirm), default to lead-safe work methods, wet scraping, containment, no power sanding or open-flame burning, and use certified renovation practices or contractors for meaningful surface areas, with soil below chronic peel zones treated as suspect. The rule reframes old-house strategy: on sound-but-ugly lead layers, encapsulation and careful topcoating often beat aggressive removal, disturbance being the hazard.

The bottom line

Read the peel before buying the paint: bare-wood curls are water with an address, intercoat letting-go is prep, alligatoring is the film’s old age, and blisters are weather and haste. Fix the moisture first, prep like the coating depends on it, respect the pre-1978 layers, and let any wall that keeps peeling in the same place send you hunting the water instead of the color chart.