This will ensure that errant mold spores do not migrate from the containment area into surrounding areas.)Will you repair the source of the moisture or do I need to call another contractor?

Try to keep mulch or materials that retain moisture well away from your asset.

You can clean it off but obviously you have some kind of venting/moisture issue.

You might deal with it for a while trying to fix the problem with the source of moisture.  

If I see moisture there I look closer.

If the existing hardwood is not sealed up completely the moisture from the concrete could cause the boards to warp and buckle causing other problems.

What's interesting is that the inside of the shed roof is in pristine condition with no penetration of the rust from the outside...yet.My goal is to preserve the shed from further deterioration.

this keeps moisture and wind from coming into the house. you will have a tough time removing and putting anything back. i would recommend trying to treat it.

You could have moisture issues, which will shorten the life of the paint, and even if you don't, it has to be repainted at some point indefinitely.

Phillip:We use a variety of liquid, moisture, and humidity sensors with our building monitoring set-up to detect leaks (or when a bathroom fan or the HRV needs to be switched on) and have begun incorporating them into our renovations.That said, with the exception of humidistats on bathroom fans, the best offence we've found is prevention.