Good evening all. I've got a job of installing electrics to a 5mx4m wooden building. This is currently sat on a 6mx8m concrete slab. You can see where the wood is damp due to just sitting on this slab with no dampproofing or shedbase. I'm concerned that all my work is going to wasted unless this structure is lifted and a proper shed base is built. What advise can I give to persuade owner to do something about this so it doesn't bite him later please. Tia Jack