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Is the yellowish stuff on concrete mold?

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See attached photo.

This is air duct space (crawl place? Not sure of vocab) above an office.

The top part is I believe concrete. See how there are parts that are yellow? What is that? mold? Efflorescence? Patched of insulation? If efflorescence or mold could it indicate an ongoing moisture problem that could be bad?


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What's above that slab? Is there any reason they would have placed insulation against it?

There's always the possibility that some sort of form release agent was sprayed on the forms before the pour, and you're seeing some of it left over. Whatever it is, it was there before the channel was installed.

On the upper other side of the slab on the floor above is another office. I don't know if there is anything between the two offices or not.

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