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Soffit Mold Issues

Few areas of mold growth are more mysterious and confusing than soffit mold growth.  Unlike growth in other areas of a home, soffit growth does not appear to follow any reliable pattern.  One house can suffer from major mold growth, while the neighbor’s home is spotless.  Despite these inconsistencies, two variables have been found that determine mold growth – paint quality and settled dust.

Mold on soffits

Latex paint, unfortunately is a perfect food source for mold growth.  To combat this, paint manufacturers add different antifungal additives, with varying degrees of success.  The second variable, settled dust, also can have a profound effect on mold growth rates.  It occurs when a thin layer of dust settles on the paint.  This can occur on vertical and even overhanging surfaces.  Unfortunately, even this settled dust can act as a food source for mold, effectively nullifying the benefit of a high quality, anti-fungal paint.  What is the solution?  Use a high quality paint, and regularly clean problem areas.


FAQ’s related to soffit mold issues.

What does the mold growth typically look like?

Soffit mold almost always appears with a dark grey or black coloration.  The growth pattern tends towards radiating, circular spotting.  Dimensionally, the mold growth is typically flat.

How is mold growth removed from soffits?

Soffit mold growth can often be removed without professional remediation. Because it is outside the conditioned airspace of the home, there is little danger of affecting the indoor air quality.  Soffit mold will typically disappear or greatly diminish after a treatment with store bought cleaners.

What steps are necessary to prevent mold growth from returning to the soffits?

Permanently preventing the mold growth from returning can be difficult.  Regular cleaning and pressure washing, combined with chemical treatments can help.  Several companies, including Zinsser, offer exterior grade paint products with warranties against mold growth.


Soffit Mold Growth

Mold growth on soffits – likely due to bathroom exhaust ducts pointed at soffit vents.



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