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Cleaning block retaining wall

mbrandt

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Apr 5, 2011
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Mark Brandt
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Mold and mildew retaining wall block. Suggestions on what chemical to use and procedures
 

Mama Fen

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First, a question - is the block wall painted?

Mold cannot grow on cinder block, so it must be growing on something that's ON the block. If it's painted, removal is easy - hepa vac, peroxide treatment like Sentinel Envirowash or thymol treatment like Benefect or Bioesque, then hepa vac again.

If it's NOT painted, then the first step becomes figuring out what, exactly, is on the block that is allowing mold growth.

Could it possibly be efflorescence and not mold growth you're seeing?
 

mbrandt

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Apr 5, 2011
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Wisconsin
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Mark Brandt
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United States
First, a question - is the block wall painted?

Mold cannot grow on cinder block, so it must be growing on something that's ON the block. If it's painted, removal is easy - hepa vac, peroxide treatment like Sentinel Envirowash or thymol treatment like Benefect or Bioesque, then hepa vac again.

If it's NOT painted, then the first step becomes figuring out what, exactly, is on the block that is allowing mold growth.

Could it possibly be efflorescence and not mold growth you're seeing?
Thanks for your quick reply. Not painted block. I cleaned this last year but pressure washed. What is growing is mildew and licken. I just wondered about a solution I could apply and it would kill organic mater than if needed pressure wash
 

Mama Fen

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Thanks for your quick reply. Not painted block. I cleaned this last year but pressure washed. What is growing is mildew and licken. I just wondered about a solution I could apply and it would kill organic mater than if needed pressure wash
If the block is in ground contact, and it's wet enough to be supporting true lichens, then honestly I would just pressure-wash and plan on regular maintenance cleaning to keep the growth down to a manageable level. There's nothing I know of that would prevent organic growth in that kind of damp situation for very long... that wouldn't also be extremely toxic. Even barrier products would eventually fail.
 
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Hoss4x4

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12.5 SH with Lemonator down streamed and rinsed. Usually took atleast two years to see the returned growth