In short
Spalling is concrete cracking away from rusting steel, and in Hawaii's salt air it is a matter of when, not if. Treat repairs as a recurring reserve component, size it from an engineer's survey or your own repair records, and never let it hide inside a general maintenance line.
Walk the lanai of almost any Honolulu tower built before the 1990s and you will find it: a patch of new concrete, a crack running along the slab edge, a rust stain bleeding down from under a railing post. That is spalling, and for a Hawaii condominium it is one of the largest and least predictable lines in the reserve plan.
What is actually happening
Reinforced concrete depends on the steel inside it staying protected. Fresh concrete is alkaline, and that keeps the rebar from rusting. Over decades, chloride from salt air works its way in through cracks and porous surfaces. Once enough of it reaches the steel, the steel corrodes. Rust takes up more room than steel, so it pushes outward until the concrete cover cracks and breaks away.
In Hawaii three things speed this up: salt carried on the trade winds, constant warmth, and buildings designed when concrete cover over the rebar was often thinner than it is today. Lanai slabs, slab edges, parking structures and railing post pockets usually go first, because water sits there.
Why it belongs in the reserve study
Spalling repair is not a one-time project. Patch one area and the next one appears a few years later, as chloride keeps reaching more of the steel. The honest way to budget for it is as a recurring component: a repair program every several years, with a cost based on how much concrete is likely to need work each time.
That matters under HRS 514B-148. The budget must show the replacement reserves the association needs based on a reserve study, and Hawaii’s rules (the Real Estate Commission’s, if not the statute itself) expect separate reserves for parts costing more than $10,000 to replace; confirm the current threshold with your attorney. A spalling program in a mid-size tower clears that threshold easily. If your study folds concrete into “general building maintenance”, ask for it to be broken out.
What a reserve study can and cannot tell you
A reserve study is a visual review for budgeting. The provider will see stains, cracks and old patches, and can set a reasonable allowance. What the provider cannot do is tell you how much hidden deterioration there is. That takes an engineer: sounding the slabs, mapping the cracks, sometimes testing cores for chloride content.
Our advice for boards:
- If you have never had a concrete survey, get one before the next full reserve study. Hand the engineer’s report to the reserve provider and ask them to use its quantities.
- If you have repair records, use them. Square feet repaired in each past program, and what it cost, are the best evidence for the next cycle.
- Ask for the cycle to be explicit. The study should say how often the program repeats, how much it covers each time and how the cost was reached.
- Price the access. In a tower, swing stages, scaffolding or rope access can cost as much as the repair. Make sure the allowance includes it.
The cost of waiting
Spalling does not wait for the budget. Small repairs left alone become large ones, and loose concrete over a walkway is a safety problem the board must act on regardless of what is in the reserve account. Associations that carry the repair cycle in their study fund it a little at a time. Those that do not end up paying for it as a special assessment, usually in the same year as something else.
If your building is due for a study, a provider who knows Hawaii high-rises will ask about concrete in the first conversation. If they do not, ask them. You can start with a quote request through our Hawaii reserve studies page, and tell us about the concrete in the notes.