We put lining underneath them to prevent any moisture getting into the subfloor.

water / Moisture on back wall can lead to more problems Flooring / Carpet problems Possible Mold .

We also give all new tenants, regardless of the age of the building, the EPA booklet "A Brief Guide to Mold, Moisture, and Your Home".

So far there's no problem with water or peeling -- being a high moisture environment I'm keeping an eye out for that as a possibility. 

The nature of our landscape is as the moisture changes the soil expands and contracts, thus playing havoc with foundations, whether they are slabs or pier and beam.  

@Mark HallWe've rolled our own building monitoring system, leverage the Internet of Things (IoT) which allows us to:monitor & control HVAC (thermostats, humidistats, etc);monitor moisture sensors (under basement subfloors, in catch pans under water heater storage tanks, laundry units, dishwashers);monitor motion sensors (attic hatches and other off-limits sections of the properties)remotely mange and control door locks (no going to the property at 03:00 for tenants who have locked themselves out; service technicians can be given one-time access codes)We are always playing with new ideas and adding new capabilities.

It does look like the shingles are absorbing some moisture around the seams..

There's just too much that an untrained eye can miss, not to mention a good inspector has certain tools they use to help identify issues, like a foundation level meter, water moisture meter, etc.In my mind, having your contractor(s) walk through with you is still technically an inspection.

No mold remediation company in their right mind will ever provide a guarantee on their work if the source of the moisture isn't corrected.

The peeling paint on the window in the back of the house could be a moisture issue.