Why prep matters so much here
Weatherboard homes are everywhere across South Australia, and they’ve got a particular charm that brick veneer just doesn’t match. But that timber also takes a real hit from Adelaide’s dry heat, UV exposure, and the odd wild storm that rolls through in winter. Skip the prep work and even a good quality paint will start peeling within a couple of years. Do the prep properly and you’re looking at a finish that lasts a decade or more.
Inspecting and cleaning the boards
Start by actually inspecting the boards, not just glancing at them from the ground. Look for:
- Cracked, split, or rotting sections that need replacing before you go anywhere near a paintbrush, since paint over rot just hides the problem while it keeps spreading underneath
- Existing paint that’s flaking or chalking. Run a hand over the surface and if it comes away with a fine powder, that’s chalking, and it needs a proper scrape and sand before new paint will bond to it at all
Cleaning comes next, and in South Australia this usually means dealing with a season’s worth of dust as much as anything else. A pressure wash on a low setting works well for weatherboard, but go easy. Too much pressure forces water behind the boards and under laps, which causes problems down the track that are far more annoying to fix than a bit of extra scrubbing now. Let the timber dry out fully before you touch it again, which in Adelaide’s climate is usually a day or two in the warmer months, longer if you’ve had recent rain.
Filling, sanding and priming
Sanding any rough or peeling sections, filling gaps and nail holes, then priming exposed or bare timber is where a lot of DIY jobs go wrong. People skip priming because they’re keen to get to the “real” painting, and the topcoat ends up soaking unevenly into bare wood, leaving patches that look different from the rest of the wall within a year. A quality exterior primer designed for timber gives the topcoat something consistent to grip onto.
Choosing the right topcoat
When it comes to the paint itself, look for exterior acrylic formulated to handle UV exposure and temperature swings, since South Australian summers can push weatherboard through some serious heat cycling that ordinary paint just isn’t built for. Two coats is the standard for a reason. One coat rarely gives even coverage over old paint colours, and it won’t hold up nearly as long.
If you’re not sure which product suits your specific boards, it’s worth having a chat with someone who actually knows paint rather than guessing off a tin label. That’s the difference between a job that looks good for two years and one that looks good for ten.