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Looks strange but it is only on one panel of wood. Wouldn't mold be spreading across the boards?

There are also a few boards of blue color. That can't be mold can it? pic 1

close up

blue1

blue2

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It looks to me like weathered OSB roofing in the second picture. The first picture is likely concrete/mortar. Construction companies will generally still use boards that were used for mixing or forming concrete/mortar. If it were mold, it probably wouldn't be isolated to those single boards and would be "creeping" over the roof trusses. So in short, no, it's not mold.

  • I tend to agree with tbox. Is the stuff pictured very hard like hardened concrete or is it soft and easily smeared with your hand? – shirlock homes Aug 12 '16 at 10:50
  • Seems to be dusty. Thanks for the feedback everyone! – duyn9uyen Aug 12 '16 at 12:19

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