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August 30 - September 7, 2010

What are the alternatives for removing mildew from previously uncoated concrete block exteriors before coating?

Selected Answers

From Roy Bradley of Laing O'Rourke on September 7, 2010:
Whilst pressure washing may be effective in the short term, it may be more appropriate to apply a fungicidal solution, allow it to dry, then remove the dead mildew. The majority of proprietary fungicidal solutions have some residual effect probably lasting up to 6 months. The coating to be applied should contain a fungicide if the conditions that have caused the mildew in the first place cannot be controlled, such as a damp environment, high humidity etc.

From Marco Antonio Alvarado Meneses of Sherwin Williams Perú on September 6, 2010:
Mix detergent with commercial sodium hypochlorite and water, then scrub the affected area. Rinse with tap water. Before coating, you have to permit the concrete to dry. Remember that a hypochlorite solution may corrode metal.

From remko tas of Futuro SRL on September 1, 2010:
Use pressure washing or, if needed, a more thorough approach: abrasive blasting.

From Alfonso Gamboa of NA on August 31, 2010:
Use clorox.

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