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  1. #1
    Member Sophomore Undergraduate Heber's Avatar
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    Need some assistance

    I have a customer that called me yesterday and some black looking mold on the staircases of the apartment he oversees. I have attached a picture below. I tried a 60/40 roof mix with a hard bush and it cleaned the stairs but the black area was still there. Do you have any advice on the chemical I should use. Thanks for the help

    image.jpeg

  • #2
    Member Sophomore Undergraduate JWBris's Avatar
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    I'm no expert on treating mould on timber, but I would test a small section with a stronger bleach mix with a paintbrush. Then nuetralize it with vinegar and water.
    I'd imagine you would want to keep it damp and not let the bleach section dry out.
    Sorry I can't be of more help!
    Brett
    Jet Works
    Brisbane, Australia
    www.JETWORKS.com.au

  • #3
    Member Honorary Professor DunRite's Avatar
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    That looks too embedded for a bleach solution to work effectively

    A serum of concentrated Hydrogen Peroxide soaked in is what we use on restoration jobs= a 30% Concentrated mix-

    Make sure you use gloves and a mask

  • #4
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    Look up blue stain . Pretty sure that's what it is .It getting pretty common on new pt lumber or on what I've seen in the last couple of years.

    Vinegar doesn't neutralize bleach .


    Jim Foley, Owner/Operator
    www.ipressureclean.com
    203-754-4284 or 860-354-0855

  • #5
    Moderator 11000 PLUS POSTER Christopher's Avatar
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    Could the boards have a sealer preventing the mix to penetrate?

  • #6
    Member Graduate Student Zap It Wash's Avatar
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    What Jim said I see that in pt lumber all the time now
    Jason Butler - Charlotte, NC
    Zap It Wash
    Website

    704-919-9730

  • #7
    Member Sophomore Undergraduate Heber's Avatar
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    Do you have a chemical or know one that will clean it? Thank you again for your help

  • #8
    Member Honorary Professor Kiloman's Avatar
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    A Sander an about 3 hrs labor
    Hal Brown
    Company Name
    ABV Pressure Washing
    336 736 0008
    Sophia Nc
    http:www.AbvPressureWashing.com

  • #9
    Member Graduate Student
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    It's not worth the effort trying to sand it out .. Causing other issues and not knowing the depth of stain. Bleach and using an acid will lighten it up but not get rid of it . I have tried stronger acids ( one restore / f9 ) and every other thing that could be thought of to remove.

    Builders have to select boards better . It's visible !


    Jim Foley, Owner/Operator
    www.ipressureclean.com
    203-754-4284 or 860-354-0855

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