Hey guys, I'm having an absolute mare of a time trying to figure out if I even have an issue to worry about.

We have a corrugated steel shed (walls and roof) on a concrete block. The concrete block is hi spec and the shed is all metal. It has vermin trap edging around the bottom. It also has eco-batts and is lined with Gib. The inside structure is wooden. 

Im really worried there is moisture going to get up into the walls from the outside by way of there being no seal between teh concrete base and the bottom of the steel sheets. And also because of the way the corrugated iron sits it has obvious gaps for air to get up and under.

Should i be concerned about moisture getting in between the outer steel and the batts/gib? Or is it only rainfall thats an issue with mould etc. The inside of the barn is quite condensation-y on the windows too. 

Its used as our office and rumpus room so its carpeted too. 

I'm also trying to find a build to come and take another look but have only had feedback from 2 people on builderscrack who aren't really the right type of labourer for this job.