Mold on Insulation or just Discoloration?

Discussion in 'Insulation and Radiant Barriers' started by JiminyCrickets, Feb 23, 2012.

  1. Feb 23, 2012 #1

    JiminyCrickets

    JiminyCrickets

    JiminyCrickets

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    I have some insulation I put up a couple of months ago and never covered with drywall. I went up and looked at it today and it was discolored in some areas just like the ones in these pics:[​IMG]
    [​IMG]
    [​IMG]

    (Those are pics of some other guys insulatin on another thread but mine look exactly like that.)

    Someone on that thread said it is normal and just discoloration.

    I can't remember if it was like that when I put it up or not and I am wondering if it's normal or not.

    Someone told the guy on the other thread who's pics are above to spay bleach on them to find out if it is indeed mold or just discoloration, does anyone know what the bleach would do if sprayed on to let you know if it is mold or not?

    Look forward to your replies.

    Thanks :)
     
  2. Feb 23, 2012 #2

    nealtw

    nealtw

    nealtw

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  3. Feb 24, 2012 #3

    JiminyCrickets

    JiminyCrickets

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    I think mine is a different brand then in the pic but it looks exactly like that. Yea I opened another package today and it was the same way.
     
  4. Mar 1, 2012 #4

    GBR

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    That is the asphalt coating on the other side of the paper facing showing through, perfectly normal.

    Gary
     
  5. Mar 1, 2012 #5

    JiminyCrickets

    JiminyCrickets

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    Thanks. I was thinking it was probably something like that. :)
     
  6. Mar 1, 2012 #6

    GBR

    GBR

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    You're welcome!

    I hope you installed without using the tabs (pressure fit) or at least face-stapled them to cut down on convective loops. No compression, slit the batt for wiring, batt needs direct contact with drywall, etc.: http://www.advancedinsulationinc.com/resources/Getting_Quality_from_Fiberglass_Insulation.pdf

    I would even caulk the sheathing/stud/plate joints unless board sheathing against air infiltration degrading f.g. by 66% R-value. ADA the drywall: http://www.buildingscience.com/documents/information-sheets/air-barriers-airtight-drywall-approach/

    Air seal around the electrical boxes- switches, outlets, etc.- as you lose -100 times more there than through diffusion. If you have access to the rim joists, foam board them and air seal with canned foam: http://www.buildingscience.com/documents/information-sheets/critical-seal-spray-foam-at-rim-joist/ Solid rim wood is R-1.25 per inch.......

    Gary
     

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