Dennis Krouse
09-12-2011, 03:20 AM
Found this on the side of a house. Construction is Hardee plank on concrete slab. Substance won't wash off oand is like velvet in texture. Any clues?
John Ghent
09-12-2011, 04:37 AM
Looks like moisture got into the joint between the foundation and the slab, probably through the crack or cracks. I obviously is a fungus. Try spraying with salt water or vinegar and water. Does not look like it will eat the house.
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