Looks like mold on attic beam...but no leaks detected

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Old 10-10-16, 10:24 AM
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Looks like mold on attic beam...but no leaks detected

Hi, noticed today that there is one beam that runs the width of my attic that has what looks like black mold all along it. I haven't seen any leaks or water damage anywhere or any sign of mold on any other surface. Any thought what would cause that? Obviously , there's a condition to support its growth but not sure what to do next, if anything. Should I bother cleaning it or just keep an eye on the situation for changes?
 
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Old 10-10-16, 10:28 AM
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It could have gotten there when the house was being built. Clean it if you want, the main thing is to keep track of it to make sure it doesn't grow.
 
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Old 10-10-16, 11:24 AM
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Dab some bleach on the spots you think are mold. They will turn white if they are mold. If it is mold wipe bleach to kill it.
 
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Old 10-10-16, 11:36 AM
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Thanks for the replies so far. I had read somewhere that bleach only changes the color of the mold but doesn't actually kill it. Any truth to that?
 
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Old 10-10-16, 11:54 AM
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Mold needs moisture, food and warmth. If you really don't have a leak, this is likely long dead mold anyway.
 

Last edited by stickshift; 10-10-16 at 02:31 PM.
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Old 10-10-16, 02:26 PM
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Bleach will kill mildew, not sure about mold. The 3 things mold needs to grow are moisture, heat and a food source - remove any 1 of the 3 and the mold won't thrive.
 
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Old 10-11-16, 07:11 AM
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Moisture in the attic can come from sources other than a leak, that's one of the reasons we ventilate that space. What is in place for attic ventilation and are there any bath fans (or other) being vented up there. Air sealing from house to attic is also a prime concern.

Bud
 
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Old 11-02-16, 07:59 AM
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You could always coat it with some Kilz or Zinsser (mold killing primer) I always have a little of that around.

Markster ? out of the three things that feed mold
what is the food source?
 
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Old 11-02-16, 11:25 AM
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The food source is the wood, drywall, paint, etc.
 
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