Jump to content

Is the yellowish stuff on concrete mold?


Recommended Posts

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
tn_20149223940_image.jpg

39.8 KB

Link to post
Share on other sites

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.

Link to post
Share on other sites

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.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...