Are Orange Stains on a Balcony Rust from the Slab?
An orange drip under a chair is often furniture, not the rebar. The wash treats the film. It does not open the concrete.
Rust stains on a concrete balcony are not a diagnosis you can make from the color. An orange drip under a chair leg is often the furniture, sitting on the paste. Orange at a crack, with a piece of concrete already gone, can be the steel inside, and that is an engineer's question. A wash on a downtown floor in Tampa or St. Petersburg lifts film. It does not chip concrete or coat rebar.
Why is the orange drip usually not the rebar?
Because the chair has been sitting there, and the drip matches the leg. Steel furniture, a planter ring, and a railing fastener all leave orange on the paste under them. Move the chair. If the stain is a ring the size of the foot, you have a film, not a structural finding. If the concrete has already left in a flake, stop guessing and call the association.
More than half of the total bridge inventory in the United States is reinforced concrete, and these structures have proved to be particularly susceptible to deterioration.
Source: FHWA, corrosion of steel in concreteThat sentence is why a true rebar problem cracks the cover. It is not a reason to treat every orange drip as that crack. The salt guide is the chloride story. This page is the stain you can see.
What does a wash do to the film?
Detergent and a cloth lighten a film resting on the paste. They do not pull iron out of the paste once it has stained in, and they do not stop a chair from dripping again next month. Move the feet onto a pad the building allows, or the ring returns. The stain page is the service. The floor page is the rest of the slab.
We do not apply a rust converter or a sealer. A sealer over a damp stain traps it. Pinellas humidity will show you that mistake by the next rainy stretch.
When should a board stop and call an engineer?
When the concrete is missing, when a crack has rust staining at its lip, or when the same spot shows up on several units in a line. One chair ring on one balcony is a wash. A pattern down a stack is a building question. We will photograph what we see. We will not write the engineering opinion.
| What you see | Usual meaning | This visit |
|---|---|---|
| Ring under a chair | The furniture | Wash the film, move the chair, put it back |
| Drip under a fastener | The fitting, until a crack says otherwise | Wash around it, photograph the fastener |
| Flake with orange at the edge | Possible cover failure | Stop. Photograph. Do not patch |
Does salt air make this worse on the water?
Chloride is what lets the steel corrode once moisture and oxygen are there. A waterfront rail in St. Pete sees more of that chloride than a courtyard in Hyde Park. The stain on the walking surface can still be the chair. Do not let the zip code do the diagnosis. Hillsborough buildings a few blocks inland still grow orange under a steel planter.
Because the corrosion is progressive and the resultant damage distributed in severity, repairs are needed continually.
Source: FHWA, corrosion of steel in concreteA comparison of waterfront and inland rails, written up on the inland page, is a salt map. It is not a repair manual, and it is not a reason for a different price on a Hyde Park chair ring than on a Beach Drive one.
What should you photograph for a board packet?
The stain, the thing sitting on it, and a wider shot that shows whether concrete is missing. A board member who sends only the orange, cropped tight, will get a wash quote. A board member who sends the flake will get a note that this is not a wash. Send both. If a hose quote is what another vendor offered, that is a different refusal: we do not send wash water over a tower rail, and a nozzle does not repair a spall.
We reply with the finished photos if we wash, and with the refusal if we should not. Either text is more useful than a guess in the minutes. A board packet that includes the wider shot saves a second email. Send the chair in the frame so the ring has a source.
What will the price cover?
The floor, including the film on it. Not a patch, not a coating, not a new chair. An 80 square foot balcony is the same rate whether the drip is there or not. Dirtiness, including orange dirtiness, is not a surcharge. Channelside, Beach Drive, and Bayshore send this photo every humid month. The answer is still the chair, until the concrete says otherwise. A rainy stretch from late May into early October keeps the paste damp, which is when a steel foot leaves a ring fastest. The damp does not change the rate. It changes how soon you will notice the ring. Bring the building name so the reply names the right dock.
Text a photo of the balcony if you want the visit priced before you book.
Text us a photoFrequently asked questions
Can you tell from a photo if the rebar is failing?
We can tell a chair ring from a missing piece of concrete. We cannot certify the steel. That is an engineer.
Will the orange come off?
A surface film often lightens. A stain in the paste may remain. We will say which one we are looking at on the day.
Should the association pressure-wash it?
Not from us, and not over the rail. A pressure washer is the wrong tool on a tower slab, and it does not repair a spall.
Do you apply a converter?
No. Converters and sealers are a different trade. We wash.
Is a rust ring a milestone issue?
A single chair ring is not. A pattern of cracking and staining across the building is a question for the inspection the statute already schedules, not for a cleaning quote.
Does the price change if the stain is old?
The rate is the floor. Age of the film is not a line item.
Sources
- Federal Highway Administration, corrosion of steel in concrete. www.fhwa.dot.gov
- National Weather Service, Tampa Bay rainy season. www.weather.gov