alex77 Posted September 3, 2014 Report Share Posted September 3, 2014 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? Thanks. Click to Enlarge 39.8 KB Quote Link to comment Share on other sites More sharing options...
kurt Posted September 3, 2014 Report Share Posted September 3, 2014 Yes, can't tell from the photo, probably not, no, maybe, yes. But it doesn't look it. Quote Link to comment Share on other sites More sharing options...
alex77 Posted September 3, 2014 Author Report Share Posted September 3, 2014 Thanks. Any other opinions? Quote Link to comment Share on other sites More sharing options...
kurt Posted September 3, 2014 Report Share Posted September 3, 2014 What's the area smell like? Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted September 3, 2014 Report Share Posted September 3, 2014 Is someone feeling sick? Quote Link to comment Share on other sites More sharing options...
Marc Posted September 3, 2014 Report Share Posted September 3, 2014 There's this yellow colored OSB that was in use decades ago. Perhaps it was used to form this pour and the coloring stuck to the concrete. Really can't tell without a closer photo. Marc Quote Link to comment Share on other sites More sharing options...
John Kogel Posted September 3, 2014 Report Share Posted September 3, 2014 If you could crop the picture down to just some of the yellow patches, I think we would be looking at fiberglass insulation. The wall on the left is clean and dry and there is no visible sign of moisture on the ceiling tiles, right? Bare concrete does not provide any food for mould to grow. Quote Link to comment Share on other sites More sharing options...
David Meiland Posted September 3, 2014 Report Share Posted September 3, 2014 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. Quote Link to comment Share on other sites More sharing options...
alex77 Posted September 3, 2014 Author Report Share Posted September 3, 2014 Thanks. This building was built in the 1980s. Quote Link to comment Share on other sites More sharing options...
alex77 Posted September 3, 2014 Author Report Share Posted September 3, 2014 Also, no, the ceiling tiles don't seem to have mold growth - from my pictures they appear white. Quote Link to comment Share on other sites More sharing options...
alex77 Posted September 3, 2014 Author Report Share Posted September 3, 2014 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. Quote Link to comment Share on other sites More sharing options...
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