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As mentioned looks like DPM is between the white and grey, hence the moisture/mould.
Probably would have not painted below the DPM, but not a major issue, often the paint will flake off as moisture rises through.
Is the slab insulated or have a membrane or does moisture seep up through that as well?
Best bet will probably be a dehumidifier/heater, especially if you’re keeping tools/bikes rust worthy things in there. This will also reduce/eliminate mould.
small
Newly (<1 month) refurbed and painted garage, now quite weathertight with a sealed door.
Rather warm inside, not sure how damp.
This is the mold that's bad to breathe in right?
Clean off with product then longer-term add ventilation and dehumidifer?
Thanks folks