I have a metal shed sitting on a concrete base but there is a large amount of condensation inside. The concrete base forms the floor of the shed and the base extends beyond the walls of the shed. The base is flat and solid.
Am I correct in assuming that the reason for the amount of condensation inside is due to the slab having no damp proof course laid under it? If that is correct, what would the options be to remedy the situation.?
I have thought of laying down a damp proof membrane the size of the shed itself and then adding a layer of concrete (or heavy screed) on top as a final surface. I don't want to raise it higher than needed, but again I assume that that layer would need to be reasonably thick not to crack with the DPM under it. Is there a "paint/pour" on solution to plastic sheet that would work as well?
Your feedback would be very much appreciated.