They will want to know if the slab has the legal moisture barrier and PSI concrete.

My contractor placed the tile with one corner first and allowed it to gently drop into place moving it back and forth gently massaging it into place.both methods work let me wrap this up. if you are laying a long flooring tile . you will sometimes find that the tile may rock when putting it down meaning one side is too high the other side is too low. my solution was to add thinset to the low side this sometimes made the tile uneven with the adjacent tile. my contractors solution was to cut the tile at that point of the rocking. so that now two pieces of were  on either side of the high point. this method proved effective although shortening the tile considerably. so this is a method to be used sparingly and only when necessary. all in all my floor came out very good both the floors my contractor did and the flooring i did. there are more tips but I see this is becoming way too long to sit and read. 

Give them the "Protect Your Family From Lead In Your Home" and "Mold, Moisture and Your Home" booklets that are published by the EPA. 2.

Along with Steve's gentle manner!

Please advise.It would help if we saw pictures of what you are considering.Metal is probably best because it won't dry rot from moisture or contact with the ground and animals can't chew/scratch through it.Any general contractor or a good handyman should be able to help you with this project.

Also, an Air conditioner will work more efficiently if there is less moisture in the air (Houston, Florida, Alabama, etc).  

They can also be a liability however if there is a moisture problem that cannot be easily solved.

The Triplex needed a new roof, moisture in the foundation, Caribbean termites and damage from them.

Something about moisture transfer, but he showed me where bits of mold are starting to form on the roof beams.

I informed them that the reason mold keeps reappearing is because of the moisture in the room when showering.