Can Mold Be On Concrete. Although concrete is not organic and does not provide food for mold, the dust and debris that accumulate on a concrete slab provide all the nutrients that mold fungus needs to survive. The concrete, foam and steel in a concrete wall system are not a food source for mold growth unlike wood studs, joists and wall sheathing. Wet conditions can cause mold and mildew growth on outdoor concrete like driveways, patios and steps.
Environments with a high relative humidity (rh) tend to grow more mold and bacteria. On it's own, concrete does not provide a sufficient food source for fungal growth. Coat the mold with a release agent to prevent concrete from sticking.
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Although concrete does not have sufficient food to support mold growth, it will thrive when there is adequate moisture. While mold may not find enough nourishment in concrete alone, it can feed on the moisture, algae, bacteria, salts, dust, pollen, dirt, dead skin and other particles trapped within it. Although concrete is not organic and does not provide food for mold, the dust and debris that accumulate on a concrete slab provide all the nutrients that mold fungus needs to survive. The concrete, foam and steel in a concrete wall system are not a food source for mold growth unlike wood studs, joists and wall sheathing.