Possible Mold Issue

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Old 07-08-12, 01:53 PM
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Possible Mold Issue

Hi, I noticed this blue coloring on some ceiling joists in the basement and I wanted to see if this is anything I should be worried about:

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Is this mold or something else? What should I do to take care of it?
 
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Old 07-08-12, 02:17 PM
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It almost looks like some spray paint from the lumber yard. Do you know if it was there earlier?
 
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Old 07-08-12, 03:55 PM
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I agree! I would be more concerned of screws in the doubled joist and lack of hangers or ledger. (Unless "structural" screws).

Gary
 
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Old 07-08-12, 03:58 PM
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Thanks. That's what I am hoping; that it's just paint or something. I didn't notice it before, but I may have just missed it, so I can't say that it wasn't there before with any certainty.
 
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Old 07-09-12, 06:07 AM
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GBR in WA, sorry I didn't notice your post because I posted around the same time. This is a little embarrassing but I'm a novice, and I screwed that board in to provide something for me to screw the wall framing into.

I removed that board and took some pictures again:

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The board I removed has none of that blue substance, so hopefully that means it was already there and it's just paint or something.
 
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Old 07-09-12, 08:50 AM
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I screwed that board in to provide something for me to screw the wall framing into.
I think what Gary may have been reacting to is this: Framing fasteners need to be able to hold in tension - resist backing out - and hold in torsion - resist shear forces, or forces that would act across them and break them. That's why 16d "sinkers," with the coating that melts as the nail is driven and then sets to hold it them in place, have been the basic go-to fasteners for 2X framing for decades.

Sometimes we decide that a piece will be under greater force in tension than is normal, so we'll decide to fasten it with screws instead of nails. And a lot of times we reach for a black screw that is basically a drywall screw to do that. The problem with doing that is that those screws can be very brittle. That is they have very little structural strength compared to even standard screws, and they snap easily under shear forces.

It appears, from the silver color of the screw head in your picture, that you didn't use those. But the point Gary makes is a good one to keep in mind.
 
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