Buildings along the Northern Beaches have a great outlook and a tough life. From Manly to Palm Beach, facades face salt spray, strong UV, onshore winds and driving rain, often all in the same week. The materials are the same ones used on buildings in western Sydney, but they wear out on a different timetable.
We are based in Manly, so we see this every week. This article explains what coastal exposure does to a building, which elements need the most attention, and how strata managers and committees can plan building maintenance on the Northern Beaches so small problems are caught before they become expensive ones.
What coastal exposure does to a building
Three forces do most of the damage on coastal buildings, and they work together.
- Salt: airborne salt settles on every surface. It draws in moisture, speeds up corrosion of steel and fixings, and can contaminate surfaces so new coatings do not bond properly.
- UV: strong sun breaks down paint binders and sealants. Coatings chalk and fade, and sealants harden, shrink and crack.
- Wind: onshore wind drives salt and rain into joints, gaps and window frames. Water that would run off a sheltered wall gets pushed sideways into the building.
The elevations facing the ocean usually take the worst of it. It is common to see one side of a building in fair condition and the ocean side well overdue for work.
Coatings: chalking, fading and adhesion loss
Paint is the first line of defence for render and concrete, and on the coast it works hard. Chalking (a powdery residue when you rub the wall) and fading are signs the coating is breaking down. Once the film thins or cracks, water and salt reach the substrate.
Salt also affects repainting. If salt deposits are not properly washed off before painting, the new coating can blister or lose adhesion early. Thorough pressure cleaning is an essential part of preparation on coastal jobs, not an optional extra.
Sealant around windows and joints
Sealant on coastal buildings is exposed to UV, movement and wind-driven rain all year. As it ages it hardens, pulls away from the edges and cracks. Because the failure is gradual, the first sign is often a leak inside a unit during a southerly or an east coast low.
Regular visual checks of window perimeters, expansion joints and penetrations are worth doing, particularly on the exposed elevations. Our article on signs your window sealant needs replacing covers what to look for.
Steel, concrete and concrete cancer
Salt is a major contributor to corrosion of the steel reinforcement inside concrete. As the steel rusts it expands, cracks the concrete around it and eventually pushes pieces off. This is what most people call concrete cancer, and coastal buildings, especially balcony edges, slab edges and columns, are prone to it.
Early signs include rust staining, hairline cracks along the line of the steel, and drummy or hollow-sounding concrete. Caught early, repairs are smaller and simpler. Left alone, the damage spreads and the repair gets bigger. See our concrete cancer repair page for how these repairs are carried out.
Exposed steel elements such as balustrades, brackets and fixings also need attention. Surface rust that is treated and recoated early is far easier to deal with than corrosion that has eaten into the metal.
Windows and glass
Salt film builds up on glass and frames quickly near the ocean. Apart from looking dull, it can mark glass over time and makes it harder to spot frame or seal problems. Regular high-rise window cleaning keeps the glass clear and gives the technicians a chance to notice damaged seals, loose beads or corroded frame fixings while they are there.
An inspection rhythm that suits the coast
There is no single schedule that suits every building, because exposure, materials and age all vary. That said, many coastal buildings benefit from a more frequent inspection rhythm than similar buildings inland. A practical approach is:
- A close-up facade inspection to set a baseline, with photos and marked locations
- Regular visual checks from the ground and balconies, with extra attention after major storms
- Planned cleaning of glass and facades to remove salt build-up
- Periodic close-up reviews of sealant, balcony edges and steel elements on the exposed elevations
- Annual checks of rope access anchor points, so access is ready when work is needed
The point is to find defects while they are small. A cracked joint or a rust stain is a short job. Water damage inside units or a large concrete repair is not.
A practical plan for strata managers
If you manage a coastal building, these steps help turn maintenance from reactive to planned:
- Get a baseline. Commission a close-up inspection so the committee knows the current condition of each elevation.
- Prioritise the exposed sides. Plan work on ocean-facing elevations first, rather than treating every side the same.
- Combine tasks. When a rope access crew is on the building, cleaning, sealant checks and minor repairs can often be done on the same drops, saving repeat mobilisation.
- Repair before you repaint. Fix concrete, sealant and steel defects before coating, or the new paint will fail over them.
- Keep records. Photo reports with marked locations make it easier to track deterioration and plan the capital works budget.
For more on how we work on local buildings, see our rope access services on the Northern Beaches.
Frequently asked questions
Do coastal buildings really need more maintenance than inland ones?
Generally, yes. Salt, UV and wind speed up the breakdown of coatings, sealants and steel, so the same materials tend to need attention sooner on the coast, particularly on ocean-facing elevations.
Is rope access suitable for buildings on the Northern Beaches?
Yes, as long as the building has suitable certified anchor points or they can be installed. Rope access works well on mid-rise apartment buildings where scaffolding would be costly and disruptive.
What should we fix first?
Anything letting water in, and any concrete or steel defects that could get worse or pose a safety risk. Cosmetic work like repainting should follow once those are sorted.
Talk to Ace Abseiling
Ace Abseiling is a Manly-based painting and remedial contractor working on industrial rope access, holding NSW Contractor Licence 465770C and $20M public liability. If you look after a coastal building and want a clear picture of its condition, contact us or call 1300 926 176.
