09 April The Same Paint Behaves Differently Half a Mile Inland
A property in Southbourne or Sandbanks is working against three things at once: airborne salt, wind-driven rain and, on south-facing elevations, a great deal of ultraviolet light. A property a few miles inland gets far less of all three. That is why exterior redecoration cycles near the seafront are genuinely shorter, and why a specification that works inland can disappoint on the coast.
What Tends to Fail First
The failure pattern is consistent enough that we can usually predict it from the address and the aspect.
- South and west elevations fade and chalk years before north-facing walls
- Salt crystallises in porous render and pushes coatings off from behind
- Timber sills and window bottoms go first, because water sits on them
- Metal railings and balconies rust at the fixings, then under the paint film
Breathability Matters More Than It Sounds
Older Bournemouth properties — the Victorian and Edwardian stock across Westbourne, Winton and Charminster — were built to let moisture move through the wall. Sealing that wall with an impermeable coating traps the moisture, and it then works its way out by lifting the paint.
On older solid-wall properties we specify a breathable masonry system for this reason. It costs a little more and it lasts considerably longer on the right building.
Preparation Is Where the Money Goes
On a coastal exterior, the preparation is a larger share of the job than the painting. Salt deposits have to be washed off properly, organic growth treated, chalky surfaces stabilised and every failed edge cut back to something sound. A quote that is notably cheaper than the others is almost always cheaper on preparation, and that is exactly the part that determines how long the finish lasts.
A Realistic Expectation
On an exposed coastal elevation, expect to be looking at the exterior again in five to seven years rather than eight to ten. Sheltered elevations on the same property will go longer. Washing the walls down every couple of years genuinely extends that — removing salt and algae before they get to work is the cheapest maintenance there is.