Exterior care before small problems spread.

Not always. Painting preparation is determined by coating condition, adhesion, damage and the intended new system, not cleaning alone. A wash can freshen a sound surface without being enough preparation for a repaint.

They can be discussed as part of an exterior-care enquiry. Material, condition, access and the intended finish determine the suitable scope.

A visit is useful when work is at height, damage is unclear, access is restricted, mould coverage is heavy or several exterior areas need to be considered together.

It is usually the shaded or south-facing elevation, which dries more slowly and holds moss or mould longer. That side often needs a fungicidal wash rather than a standard clean before repainting.

It depends on the material, the coating and how exposed the elevation is. Shaded, damp-prone walls typically need checking more often than a well-sunned, sheltered wall on the same house.

Yes, where the repair is within scope. Timber replacement or a small repair is best resolved before painting starts on that section, so the two are usually planned as one sequence rather than two separate jobs.

A horizontal deck surface holds moisture differently to a vertical wall, so the wash and treatment method is chosen for the material and how the surface actually weathers, not applied the same way by default.

A wash refreshes the surface. A fuller exterior clean, ahead of a repaint, is scoped to match the coating condition and material, which can include a fungicidal treatment where mould or moss is present.

Cladding type

Weatherboard, plaster and fibre-cement fail and get prepared differently, so a property with mixed cladding usually needs more than one preparation method in the same visit.

Mould and moss on shaded elevations

Walls that stay damp longer need a fungicidal wash left to work before rinsing and drying, not just a pressure wash, or new paint fails early over regrowth underneath it.

Extent of paint failure

A light chalking surface needs a wash and a spot prime. Peeling paint down to bare timber needs full scraping and same-day priming before weather gets to the exposed wood.

Access and height

Two-storey elevations, steep sections and roofline-adjacent cladding change what access equipment is needed, independent of the wall area.

Connected repairs

Timber rot, loose flashing or damaged trim found during preparation adds carpentry work that needs to be resolved before painting can proceed on that section.

Shaded and south-facing walls

The elevations that get the least sun stay damp longest and are the most likely to carry moss or mould. Resene's own guidance is to treat these with a fungicidal wash and let it work before rinsing, rather than relying on a standard clean, because regrowth under a new coat is a common cause of early failure.

Older subfloors and base boards

BRANZ has documented that many older Auckland homes were built with subfloors close to the ground and limited ventilation, which traps damp air. That moisture reaches weatherboard from behind, which is why paint failure at the base of a wall does not always match what preparation from the front alone would suggest.

Bare timber and same-day priming

Once existing paint is scraped back to bare timber, Resene's technical guidance is to prime the same day. Leaving bare weatherboard overnight, especially with Auckland's dew and humidity, can affect how well the primer bonds.

Working around Auckland's wetter months

Auckland's rainfall leans toward winter, so exterior washing and painting are easier to plan through the drier months. Cleaning can usually happen in most conditions, but coating needs a longer dry run of days to cure properly.