A cousin of mine looked at them and though they had seen a show about mold under vinyl flooring that is direct on concrete.
24+ Mold Under Vinyl Flooring Basement
PNG. They do not clean off. Luxury vinyl plank flooring looks more like hardwood or tile than ever before.
Mold Under Vinyl Flooring Basement - VINYL FLOORING ONLINE from i.pinimg.com
Allowing moisture to reach your hardwood flooring can prove hazardous. The problem with basements… the best basement flooring. Use a quality broom to enter the cracks in the concrete floor substrate.
Vinyl flooring is available in a huge number of patterns and colors, is easy to clean and is softer to walk on than most other hard surfaces.
Phew any suggestions as to why this happened. They do not clean off. We've had a lot of rain lately, and yesterday builder is still claiming that it's not necessary to dry out under the floors because they are waterproof and mold can't grow on vinyl / concrete. We have not had any issues with that will prevent any moisture from damaging the planks or creating a mold issue under the flooring.