If you're going over concrete make sure to check concrete temperature and  moisture content; both affect the bonding process during the life of the floor.

These leak more often than not and moisture invasion can be a real b****.Even with some decking you'll need to punch some holes in the roof and walking a roof flexes it and makes small holes bigger.

Walking on a roof or attaching anything is sure cause of moisture invasion.Only guys who do roofs should be up there.

In the inspection I don’t see any mention of the 20 sandbags near the foundation but the inspector did have one line stating “marginal- vegetation need to be cut back away from the house as they may damage the side” and “acceptable- drainage”When I looked back at the disclosure I see where the previous owners have repaired moisture damage in the past by a company called biosweep.

In humid flood prone Houston I can see moisture issues.

Hard wood floors in the kitchen are notorious for not holding up that great due to extra water and moisture.

Mold is often the result of continual or regular moisture on buildingmaterials.

There are moisture invasion guys, but I really don't know how you manage surface water overflow besides sump pumps since wall coatings and window/door seals don't last. 

Then ask for what soft costs (permits) are.Have no clue on an estimate otherwise, since you'll need to prevent moisture from entering via the door.

Funny enough, I find having a fan avoids so many moisture issues in the bathroom and it is something I look for and mention to almost all my clients.