Rust Stains On Concrete Floor
This isn't something that you're
going to see too often, rust stains on a concrete floor. This picture
was taken after a roof leak, forced the homeowner, to remove the
carpeting, because it wasn't drying properly and the carpeting was
starting to mildew.
Obviously you're only looking at a section of the concrete floor slab that is stained. The only areas that were stained, are the areas where moisture sat for a long period of time. This isn't uncommon, for any water damage, with in your home.
Moisture will often accumulate in the low spots of the concrete floor.
Now for the million-dollar question, what is it, that actually caused the concrete floor to stain? I really don't know, there could have been metal filings in the carpeting or underneath the carpeting, the concrete company could have used a rock or other materials, in their concrete mixture, that could have stained the floor.
Home Repair Tip: You can use vinegar to remove the stains. Pour the vinegar directly onto the concrete areas that are stained and let it sit for 15 to 30 minutes and you can repeat the process, until you are satisfied with the results.
I don't think this would be a big problem, even if you just cleaned it up, let the concrete dry out thoroughly and then re-carpet. The stains were obviously darker, when the concrete floor was wet and seemed to lighten up drastically as the floor dried out.